Saxton, Tamsin, Kristofor McCarty, Jasmine Caizley, Dane McCarrick, and Thomas V. Pollet. 2019. “Hungry People Prefer Larger Bodies and Objects: The Importance of Testing Boundary Effects.” PsyArXiv. April 11. doi:10.31234/osf.io/s7ta8
Abstract: Several experimental studies have indicated that when people are hungry, they assess larger women’s bodies as more attractive, compared to when they are satiated. These satiety-dependent judgements are assumed to contribute to the noted cross-cultural differences in attitudes towards women’s adiposity. However, it is premature to make this assumption until satiety-dependent judgements of stimuli other than female bodies have also been tested. Accordingly, we collected attractiveness judgements of female and male bodies manipulated to vary in size by varying level of adiposity, and objects manipulated to vary in size, from 186 participants who also reported their current hunger level. We found that larger sizes of stimuli in general, and women’s bodies in particular, especially when judged by women, were judged as more attractive at higher levels under conditions of hunger. We discuss these patterns in the context of the Insurance Hypothesis, the Environmental Security Hypothesis, and the impact of hunger on acquisition.
Thursday, April 11, 2019
From 2013... Do not end the filibuster: Because narrow Senate majorities often represent only a minority of Americans, many filibusters are not at odds with majority rule at all
The Majoritarian Filibuster. Benjamin Eidelson. Yale Law Journal (2013), Volume 122, Issue 4. https://digitalcommons.law.yale.edu/cgi/viewcontent.cgi?article=5549&context=ylj
ABSTRACT:The debate over the Senate filibuster revolves around its apparent conflict with the principle of majority rule. Because narrow Senate majorities often represent only a minority of Americans, however, many filibusters are not at odds with majority rule at all. Bypaying attention to such "majoritarian filibusters," this Note aims to disrupt the terms of the traditional debate and open up a new space for potential compromise. This Note reports the first empirical study of the majoritarian or countermajoritarian character of recent filibusters. These data reveal that, in half of the Congresses over the past two decades, successful filibustering minorities usually represented more people than the majorities they defeated. The choicewhether to preserve the filibuster therefore cannot be reduced to a simple choice between majority rule and minority rights. After exploring the distribution of majoritarian and countermajoritarian filibusters along other dimensions of interest, this Note proposes that themajority-rule principle might be better served by simply reducing the sixty-vote cloture threshold-thereby shifting the balance toward majoritarian as opposed to countermajoritarian filibusters-than by abolishing the filibuster altogether.
ABSTRACT:The debate over the Senate filibuster revolves around its apparent conflict with the principle of majority rule. Because narrow Senate majorities often represent only a minority of Americans, however, many filibusters are not at odds with majority rule at all. Bypaying attention to such "majoritarian filibusters," this Note aims to disrupt the terms of the traditional debate and open up a new space for potential compromise. This Note reports the first empirical study of the majoritarian or countermajoritarian character of recent filibusters. These data reveal that, in half of the Congresses over the past two decades, successful filibustering minorities usually represented more people than the majorities they defeated. The choicewhether to preserve the filibuster therefore cannot be reduced to a simple choice between majority rule and minority rights. After exploring the distribution of majoritarian and countermajoritarian filibusters along other dimensions of interest, this Note proposes that themajority-rule principle might be better served by simply reducing the sixty-vote cloture threshold-thereby shifting the balance toward majoritarian as opposed to countermajoritarian filibusters-than by abolishing the filibuster altogether.
Even in the rare cases where smartphones might alter cognition, this effect is likely transitory
An examination of the potential lingering effects of smartphone use on cognition. Peter Frost et al. Applied Cognitive Psychology, March 18 2019. https://doi.org/10.1002/acp.3546
Summary
Smartphones might offer an extension of our own cognitive abilities, potentially preventing practice of certain forms of cognition. Our first study established that heavier usage of smartphones was negatively correlated with social problem solving and delayed gratification, as well as positively correlated with some aspects of critical thinking. Studies 2 and 3 involved experiments where participants were assigned to either a lower or higher smartphone usage group. In both experiments, higher usage of smartphones led only to a diminished ability to interpret and analyze the deeper meaning of information. However, Study 3 showed that, after a 4‐week interval, the difference in the ability to interpret and analyze meaning between lower and higher phone usage groups was no longer evident. The findings of this study suggest that, even in the rare cases where smartphones might alter cognition, this effect is likely transitory.
1 INTRODUCTION
In his book, “The Shallows,” Carr (2010) suggests the following when it comes to how technology might be changing our cognition:
Over the past few years I've had the uncomfortable sense that someone, or something, has been tinkering with my brain, remapping the neural circuitry, reprogramming the memory. My mind isn't going—so far as I can tell—but it's changing. I'm not thinking the way I used to think. (Carr, 2010, p. 5)
Other popular media and books portray smartphones, social media, and other technology as diminishing cognitive capacities, like attention and concentration (Bauerlein, 2011).
Smartphone technology, in particular, is taking on an increasingly larger role in our daily mental activities. Pew Research data show that 77% of all U.S. adults had a smartphone in 2018, up from 35% in 2011 (Pew Research Center, 2018). The Pew Center also indicated that, in 2018, 94% of people from age 18 to 29 owned a smartphone. While access to smartphone technology has grown, so too has the body of literature investigating the concurrent and immediate residual inhibitory effects of these devices on certain forms of cognition, particularly attention (Strayer, Cooper, Turrill, Coleman, & Hopman, 2015; Strayer & Drews, 2007). Our study, however, focuses more on the potential for longer term effects these devices might exert on higher order cognition, including the ability to think critically, problem solve, reason, and engage in executive control. Some researchers acknowledge that consideration of the intersection between cognition and technology is an understudied area in psychology (Pennycook, Fugelsang, & Koehler, 2015; Wilmer, Sherman, & Chein, 2017).
If we consider the neuroplasticity of the brain—its ability to physically alter neural connectivity on the basis of changes in the environment and experience—could smartphone technology, which provides immediate and 24/7 access to the internet, be altering our cognitive abilities? Underlying this debate is the neuropsychological phenomenon of “use‐it‐or‐lose it,” demonstrated by neuroimaging and physiological studies that show new experiences strengthen synaptic connections in areas of the brain frequently used while weakening connections that are rarely used (Carr, 2010). Reliance on mobile phone technology as a form of “extended cognition” (Barr, Pennycook, Stolz, & Fugelsang, 2015; Clayton, Leshner, & Almond, 2015) or “ibrain” (Small & Vorgan, 2008) might be leading to changes occurring in the brain that alter our ability to engage in various cognitive processes. Might easy access to information take away from practice of more deliberative thoughts and critical thinking skills? Moreover, might the constant notifications and cues provided by mobile phones be interrupting our ability to engage in higher cognition and/or delay gratification for longer term goals?
Some studies, such as that by Barr et al. (2015), have examined whether there may be a correlation between analytical thinking and smartphone technology. Barr and colleagues found that people who relied more heavily on smartphones and information sources performed worse on analytic‐thinking tasks. In a separate review article, Pennycook et al. (2015) acknowledged that this preliminary research suggests that smartphones may serve as a “second brain” that allows people to offload thinking.
Some studies show that smartphones might influence other forms of higher order cognitive functions, such as executive function and ability to delay gratification. The ability to resist temptation in favor of long‐term goals has important implications for individual, societal, and economic success (Casey et al., 2011). Delay of gratification is also negatively correlated with the control abilities in children and adults (Casey et al., 2011; Metcalfe & Mischel, 1999).
Wilmer and Chein (2016) showed that higher scores on a self‐report measure of mobile technology engagement was correlated with a weaker tendency to delay gratification, as measured by a delay discounting task. Their self‐report questionnaire measured (a) daily usage of social media apps, (b) frequency of posting public status updates, and (c) phone‐checking behavior. Wilmer and Chein found a negative correlation between mobile device engagement and delay of gratification. They also found that this relationship might be specifically mediated by individual differences in impulse control and not reward sensitivity. The correlational nature of this study limited inferences about causation, but did show an interesting association between mobile device usage and habits associated with delay of gratification.
There is also evidence that the use of smartphones is correlated with some subjective reports associated with attention. Marty‐Dugas, Ralph, Oakman, and Smilek (2018) found that the results of a self‐report that assessed attention lapses, attention‐related errors, and mind wandering was positively related to results of a self‐report that assessed extent of smartphone use. These researchers found the correlation was particularly strong for participants who used smartphones without a specific purpose in mind (for what they referred to as “absent‐minded” usage). Even the mere presence of smartphones can interrupt attention and task performance (Thornton, Faires, Robbins, & Rollins, 2014). These studies show a relationship between concurrent smartphone use and attention. What about lingering effects on attention?
There is research showing that the multitasking aspect of smartphone technology habits, particularly for purposes of using social media, might relate to longer term effects on control of attention and concentration. Ophir, Clifford, and Wagner (2009) had participants engage in a number classification task (even or odd?) or letter classification task (vowel or consonant?). They then occasionally switched tasks. They calculated a “switch cost” as the difference in mean response time between trials preceded by a trial of the other type (switch trials) minus trials preceded by a trail of the same type (nonswitch trials). The switch cost for heavy social media multitaskers was 167 ms greater than that of low social media multitaskers. Heavy social media multimedia users performed worse on a test of task switching, perhaps—they speculated—because of reduced ability to filter out interference from irrelevant representations.
Relevant to smartphone usage for social networking purposes, studies show a positive association between heavier usage of social networking sites and diminished cognitive control or lack of judgment (Alloway & Alloway, 2012; Cao, Masood, Luqman, & Ali, 2018; Chen & Kim, 2013). Chen and Kim (2013) found that, if heavier users of social networking sites went to them for entertainment or pleasure, those desires overrode privacy concerns, such as unauthorized secondary use and improper access. Heavier usage was also associated with greater problematic social networking behaviors. Chen and Kim identified problematic social networking use based on Young's (1998) 20‐item version of problematic Internet use, and items were adjusted to be more relevant to the context of social networking. For example, respondents were asked if they found themselves staying on social networking sites longer than they intended, and if they feared that life without social networking sites would be empty and joyless. They suggest that problematic use might be a compulsivity control issue that cannot be overridden by recognition of potential long‐term exposure to harm. Again, though, a causal link was not established in this particular study. It is unclear whether heavy usage of social networking attracts people with less cognitive control or if social networking may be contributing to a lack of cognitive control. Some of these studies also emphasize the most extreme cases of heavy technology usage.
Some studies also find a negative association between the use of mobile phone technology and working memory (Abramson et al., 2009). Abramson et al. (2009) administered a questionnaire about mobile phone usage. They administered cognitive tests and found that the more frequently calls were made per week, the poorer was working memory accuracy and reaction time for a simple learning task was shorter.
Some studies have also explored whether the frequent interruptions from smartphones influences social reasoning and learning. Reed, Hirsh‐Pasek, and Golinkoff (2017) conducted an experiment where they found that phone interruptions that occurred when a mother was attempting to teach their 2‐year‐old novel words lead to poorer language acquisition. Though these studies show a concurrent effect of smartphone interruptions on social reasoning and learning, few studies have explored lingering effects of smartphone use on social cognition. Other studies show evidence that reliance on smartphone use for social interactions might correlate with poorer social skills and reasoning (e.g., Jin & Park, 2012). Our series of studies, particularly Studies 2 and 3, included controlled experiments to explore causative aspects pertaining to lingering effects of smartphone use.
It should be noted that whereas some studies have explored potential associations between smartphone usage and cognition, some studies have also explored whether exposure to the electromagnetic radiation emitted by smartphone technology alters cognition and brain physiology. Recent research shows that exposure to electromagnetic fields from smartphones does not alter event‐related potentials, like N100, P200, N200, P300 latencies and N2‐P300 amplitudes (Mohan, Khaliq, Panwar, & Vaney, 2016), nor do these fields alter measures of attention and short‐term memory (Cinel, Boldini, Fox, & Russo, 2008). Therefore, it is not likely that electromagnetic fields will confound an examination of how smartphone activities (for social media, phone calls, internet browsing, etc.) might influence cognition.
Our first study explored whether smartphone usage correlated with various measures of higher order cognition, including the Delayed Gratification Inventory, Cornell Critical Thinking Test, Level Z (for college‐age participants), and Modified Means End Problem Solving. The Modified Means End was used to assess social problem solving because we suspected that higher rates of mobile phone technology and social media might lead to a lack of practice with social problem solving. Although a study by Ekinci (2014) found that problematic internet use was positively correlated with the perception of avoidant and impulsive problem solving styles, no one to our knowledge has examined the relationship between use of smartphones and direct (rather than perceptions of) problem solving.
Once we identified relationships between mobile device usage and various forms of cognition, we then used an experimental manipulation in Study 2 to determine if there were any causal links. Only the cognitive tests and scales found to be related to cognition in Study 1 were investigated in Study 2. Study 3 was intended to replicate the findings in Study 2, as well as include a longer interval of time associated with manipulation of smartphone usage.
Given previous research (e.g., Wilmer & Chein, 2016) and our suspicion that more frequent smartphone usage would lead to less reliance on higher cognition, we hypothesized that in Study 1, the use of smartphones should be negatively correlated with particular executive control abilities, particularly delay gratification and critical thinking. Further, we hypothesized in Studies 2 and 3 that higher rates of smartphone usage might cause diminished abilities associated with certain forms of higher cognition.
Our study adds to the literature on mobile phone technology and cognition by (a) examining some cognitive variables not previously associated with research on mobile technology usage, such as social problem solving and more aspects of critical thinking, (b) using tracking apps rather than self‐reports to more accurately and objectively measure usage rates, and (c) introducing experimental control in Studies 2 and 3.
We chose to use tracking apps rather than rely exclusively on self‐reports since studies have shown that people generally misjudge time durations, especially rapid, yet pervasive, checking behaviors (Grondin, 2010; Rachman, 2002). Andrews, Ellis, Shaw, and Piwek (2015) were the first to use a tracking software they developed to find out how much time was actually spent using mobile phones. Comparing self‐reported usage of mobile phones versus tracking app reports over 2 weeks, they found that their participants did not always self‐report some aspects of their mobile phone usage accurately. For example, they found that young adults far underestimated the average daily number of phone uses.
Summary
Smartphones might offer an extension of our own cognitive abilities, potentially preventing practice of certain forms of cognition. Our first study established that heavier usage of smartphones was negatively correlated with social problem solving and delayed gratification, as well as positively correlated with some aspects of critical thinking. Studies 2 and 3 involved experiments where participants were assigned to either a lower or higher smartphone usage group. In both experiments, higher usage of smartphones led only to a diminished ability to interpret and analyze the deeper meaning of information. However, Study 3 showed that, after a 4‐week interval, the difference in the ability to interpret and analyze meaning between lower and higher phone usage groups was no longer evident. The findings of this study suggest that, even in the rare cases where smartphones might alter cognition, this effect is likely transitory.
1 INTRODUCTION
In his book, “The Shallows,” Carr (2010) suggests the following when it comes to how technology might be changing our cognition:
Over the past few years I've had the uncomfortable sense that someone, or something, has been tinkering with my brain, remapping the neural circuitry, reprogramming the memory. My mind isn't going—so far as I can tell—but it's changing. I'm not thinking the way I used to think. (Carr, 2010, p. 5)
Other popular media and books portray smartphones, social media, and other technology as diminishing cognitive capacities, like attention and concentration (Bauerlein, 2011).
Smartphone technology, in particular, is taking on an increasingly larger role in our daily mental activities. Pew Research data show that 77% of all U.S. adults had a smartphone in 2018, up from 35% in 2011 (Pew Research Center, 2018). The Pew Center also indicated that, in 2018, 94% of people from age 18 to 29 owned a smartphone. While access to smartphone technology has grown, so too has the body of literature investigating the concurrent and immediate residual inhibitory effects of these devices on certain forms of cognition, particularly attention (Strayer, Cooper, Turrill, Coleman, & Hopman, 2015; Strayer & Drews, 2007). Our study, however, focuses more on the potential for longer term effects these devices might exert on higher order cognition, including the ability to think critically, problem solve, reason, and engage in executive control. Some researchers acknowledge that consideration of the intersection between cognition and technology is an understudied area in psychology (Pennycook, Fugelsang, & Koehler, 2015; Wilmer, Sherman, & Chein, 2017).
If we consider the neuroplasticity of the brain—its ability to physically alter neural connectivity on the basis of changes in the environment and experience—could smartphone technology, which provides immediate and 24/7 access to the internet, be altering our cognitive abilities? Underlying this debate is the neuropsychological phenomenon of “use‐it‐or‐lose it,” demonstrated by neuroimaging and physiological studies that show new experiences strengthen synaptic connections in areas of the brain frequently used while weakening connections that are rarely used (Carr, 2010). Reliance on mobile phone technology as a form of “extended cognition” (Barr, Pennycook, Stolz, & Fugelsang, 2015; Clayton, Leshner, & Almond, 2015) or “ibrain” (Small & Vorgan, 2008) might be leading to changes occurring in the brain that alter our ability to engage in various cognitive processes. Might easy access to information take away from practice of more deliberative thoughts and critical thinking skills? Moreover, might the constant notifications and cues provided by mobile phones be interrupting our ability to engage in higher cognition and/or delay gratification for longer term goals?
Some studies, such as that by Barr et al. (2015), have examined whether there may be a correlation between analytical thinking and smartphone technology. Barr and colleagues found that people who relied more heavily on smartphones and information sources performed worse on analytic‐thinking tasks. In a separate review article, Pennycook et al. (2015) acknowledged that this preliminary research suggests that smartphones may serve as a “second brain” that allows people to offload thinking.
Some studies show that smartphones might influence other forms of higher order cognitive functions, such as executive function and ability to delay gratification. The ability to resist temptation in favor of long‐term goals has important implications for individual, societal, and economic success (Casey et al., 2011). Delay of gratification is also negatively correlated with the control abilities in children and adults (Casey et al., 2011; Metcalfe & Mischel, 1999).
Wilmer and Chein (2016) showed that higher scores on a self‐report measure of mobile technology engagement was correlated with a weaker tendency to delay gratification, as measured by a delay discounting task. Their self‐report questionnaire measured (a) daily usage of social media apps, (b) frequency of posting public status updates, and (c) phone‐checking behavior. Wilmer and Chein found a negative correlation between mobile device engagement and delay of gratification. They also found that this relationship might be specifically mediated by individual differences in impulse control and not reward sensitivity. The correlational nature of this study limited inferences about causation, but did show an interesting association between mobile device usage and habits associated with delay of gratification.
There is also evidence that the use of smartphones is correlated with some subjective reports associated with attention. Marty‐Dugas, Ralph, Oakman, and Smilek (2018) found that the results of a self‐report that assessed attention lapses, attention‐related errors, and mind wandering was positively related to results of a self‐report that assessed extent of smartphone use. These researchers found the correlation was particularly strong for participants who used smartphones without a specific purpose in mind (for what they referred to as “absent‐minded” usage). Even the mere presence of smartphones can interrupt attention and task performance (Thornton, Faires, Robbins, & Rollins, 2014). These studies show a relationship between concurrent smartphone use and attention. What about lingering effects on attention?
There is research showing that the multitasking aspect of smartphone technology habits, particularly for purposes of using social media, might relate to longer term effects on control of attention and concentration. Ophir, Clifford, and Wagner (2009) had participants engage in a number classification task (even or odd?) or letter classification task (vowel or consonant?). They then occasionally switched tasks. They calculated a “switch cost” as the difference in mean response time between trials preceded by a trial of the other type (switch trials) minus trials preceded by a trail of the same type (nonswitch trials). The switch cost for heavy social media multitaskers was 167 ms greater than that of low social media multitaskers. Heavy social media multimedia users performed worse on a test of task switching, perhaps—they speculated—because of reduced ability to filter out interference from irrelevant representations.
Relevant to smartphone usage for social networking purposes, studies show a positive association between heavier usage of social networking sites and diminished cognitive control or lack of judgment (Alloway & Alloway, 2012; Cao, Masood, Luqman, & Ali, 2018; Chen & Kim, 2013). Chen and Kim (2013) found that, if heavier users of social networking sites went to them for entertainment or pleasure, those desires overrode privacy concerns, such as unauthorized secondary use and improper access. Heavier usage was also associated with greater problematic social networking behaviors. Chen and Kim identified problematic social networking use based on Young's (1998) 20‐item version of problematic Internet use, and items were adjusted to be more relevant to the context of social networking. For example, respondents were asked if they found themselves staying on social networking sites longer than they intended, and if they feared that life without social networking sites would be empty and joyless. They suggest that problematic use might be a compulsivity control issue that cannot be overridden by recognition of potential long‐term exposure to harm. Again, though, a causal link was not established in this particular study. It is unclear whether heavy usage of social networking attracts people with less cognitive control or if social networking may be contributing to a lack of cognitive control. Some of these studies also emphasize the most extreme cases of heavy technology usage.
Some studies also find a negative association between the use of mobile phone technology and working memory (Abramson et al., 2009). Abramson et al. (2009) administered a questionnaire about mobile phone usage. They administered cognitive tests and found that the more frequently calls were made per week, the poorer was working memory accuracy and reaction time for a simple learning task was shorter.
Some studies have also explored whether the frequent interruptions from smartphones influences social reasoning and learning. Reed, Hirsh‐Pasek, and Golinkoff (2017) conducted an experiment where they found that phone interruptions that occurred when a mother was attempting to teach their 2‐year‐old novel words lead to poorer language acquisition. Though these studies show a concurrent effect of smartphone interruptions on social reasoning and learning, few studies have explored lingering effects of smartphone use on social cognition. Other studies show evidence that reliance on smartphone use for social interactions might correlate with poorer social skills and reasoning (e.g., Jin & Park, 2012). Our series of studies, particularly Studies 2 and 3, included controlled experiments to explore causative aspects pertaining to lingering effects of smartphone use.
It should be noted that whereas some studies have explored potential associations between smartphone usage and cognition, some studies have also explored whether exposure to the electromagnetic radiation emitted by smartphone technology alters cognition and brain physiology. Recent research shows that exposure to electromagnetic fields from smartphones does not alter event‐related potentials, like N100, P200, N200, P300 latencies and N2‐P300 amplitudes (Mohan, Khaliq, Panwar, & Vaney, 2016), nor do these fields alter measures of attention and short‐term memory (Cinel, Boldini, Fox, & Russo, 2008). Therefore, it is not likely that electromagnetic fields will confound an examination of how smartphone activities (for social media, phone calls, internet browsing, etc.) might influence cognition.
Our first study explored whether smartphone usage correlated with various measures of higher order cognition, including the Delayed Gratification Inventory, Cornell Critical Thinking Test, Level Z (for college‐age participants), and Modified Means End Problem Solving. The Modified Means End was used to assess social problem solving because we suspected that higher rates of mobile phone technology and social media might lead to a lack of practice with social problem solving. Although a study by Ekinci (2014) found that problematic internet use was positively correlated with the perception of avoidant and impulsive problem solving styles, no one to our knowledge has examined the relationship between use of smartphones and direct (rather than perceptions of) problem solving.
Once we identified relationships between mobile device usage and various forms of cognition, we then used an experimental manipulation in Study 2 to determine if there were any causal links. Only the cognitive tests and scales found to be related to cognition in Study 1 were investigated in Study 2. Study 3 was intended to replicate the findings in Study 2, as well as include a longer interval of time associated with manipulation of smartphone usage.
Given previous research (e.g., Wilmer & Chein, 2016) and our suspicion that more frequent smartphone usage would lead to less reliance on higher cognition, we hypothesized that in Study 1, the use of smartphones should be negatively correlated with particular executive control abilities, particularly delay gratification and critical thinking. Further, we hypothesized in Studies 2 and 3 that higher rates of smartphone usage might cause diminished abilities associated with certain forms of higher cognition.
Our study adds to the literature on mobile phone technology and cognition by (a) examining some cognitive variables not previously associated with research on mobile technology usage, such as social problem solving and more aspects of critical thinking, (b) using tracking apps rather than self‐reports to more accurately and objectively measure usage rates, and (c) introducing experimental control in Studies 2 and 3.
We chose to use tracking apps rather than rely exclusively on self‐reports since studies have shown that people generally misjudge time durations, especially rapid, yet pervasive, checking behaviors (Grondin, 2010; Rachman, 2002). Andrews, Ellis, Shaw, and Piwek (2015) were the first to use a tracking software they developed to find out how much time was actually spent using mobile phones. Comparing self‐reported usage of mobile phones versus tracking app reports over 2 weeks, they found that their participants did not always self‐report some aspects of their mobile phone usage accurately. For example, they found that young adults far underestimated the average daily number of phone uses.
The evolutionary context of personality development: Ontogenetic and Deferred Adaptations
The evolutionary context of personality development. Marco del Giudice. In Handbook of Personality Development, Chapter 2. New York: Guilford, 2019. January 2019. https://www.researchgate.net/publication/316120672_The_evolutionary_context_of_personality_development
Ontogenetic and Deferred Adaptations
Looking at developmental stages through the lens of biological function suggests a useful distinction between two kinds of adaptations that are often observed in early life. Ontogenetic adaptations are designed to serve their fitnessenhancing function at a specific time in development, and often disappear as soon as they are no longer needed. Examples include the placenta (a fetal organ that provides nourishment and other vital functions during the fetal stage and is discarded immediately after birth) and infantile reflexes, such as the suckling reflex. Deferred adaptations are traits that appear in childhood but function—at least in part—to prepare children for adult behavior (Bjorklund & Ellis, 2014). Play is a paramount example of a deferred adaptation; in humans and other mammals, playing trains youngsters to deal with unexpected events and, at the same time, paves the way to the acquisition of specialized adult skills (e.g., foraging, fighting, parenting) (Geary, 2010; Spinka, Newberry, & Bekoff, 2001). The concept of an ontogenetic adaptation is particularly useful to understand the limits of early experiences in shaping adult personality. Some behavioral traits expressed in childhood serve important functions in the context of family life but may cease to be useful as the child turns into an independent adult. These traits may either disappear or get repurposed in a different form in the service of new developmental goals. For example, attachment styles in infancy are largely determined by the parents’ caregiving styles and show negligible genetic effects. In middle childhood, attachment styles start to become differentiated by sex, possibly under the influence of adrenal androgens; adults’ attachment styles to romantic partners are only weakly correlated with those of infancy, and reflect a sizable contribution of genetic factors (Barbaro, Boutwell, Barnes, & Shackelford, 2017; Del Giudice, 2009, 2015a). At an even deeper level, the existence of parent–offspring conflict implies that the parents’ behavior is not completely in the best interest of their children.
For this reason, children should not passively accept the influence of parents; instead, they should show a certain amount of developmental “resistance” to parental shaping. While it is difficult to directly test this hypothesis, parent– offspring conflict may well contribute to explain why family experiences have only small and inconsistent effects on the development of adult personality.
Ontogenetic and Deferred Adaptations
Looking at developmental stages through the lens of biological function suggests a useful distinction between two kinds of adaptations that are often observed in early life. Ontogenetic adaptations are designed to serve their fitnessenhancing function at a specific time in development, and often disappear as soon as they are no longer needed. Examples include the placenta (a fetal organ that provides nourishment and other vital functions during the fetal stage and is discarded immediately after birth) and infantile reflexes, such as the suckling reflex. Deferred adaptations are traits that appear in childhood but function—at least in part—to prepare children for adult behavior (Bjorklund & Ellis, 2014). Play is a paramount example of a deferred adaptation; in humans and other mammals, playing trains youngsters to deal with unexpected events and, at the same time, paves the way to the acquisition of specialized adult skills (e.g., foraging, fighting, parenting) (Geary, 2010; Spinka, Newberry, & Bekoff, 2001). The concept of an ontogenetic adaptation is particularly useful to understand the limits of early experiences in shaping adult personality. Some behavioral traits expressed in childhood serve important functions in the context of family life but may cease to be useful as the child turns into an independent adult. These traits may either disappear or get repurposed in a different form in the service of new developmental goals. For example, attachment styles in infancy are largely determined by the parents’ caregiving styles and show negligible genetic effects. In middle childhood, attachment styles start to become differentiated by sex, possibly under the influence of adrenal androgens; adults’ attachment styles to romantic partners are only weakly correlated with those of infancy, and reflect a sizable contribution of genetic factors (Barbaro, Boutwell, Barnes, & Shackelford, 2017; Del Giudice, 2009, 2015a). At an even deeper level, the existence of parent–offspring conflict implies that the parents’ behavior is not completely in the best interest of their children.
For this reason, children should not passively accept the influence of parents; instead, they should show a certain amount of developmental “resistance” to parental shaping. While it is difficult to directly test this hypothesis, parent– offspring conflict may well contribute to explain why family experiences have only small and inconsistent effects on the development of adult personality.
Rolf Degen summarizing: The emergence of the ability to build elevated sleeping nests allowed great apes to adopt a more comfortable & human-like sleep posture than the one monkeys take up
Nesting, sleeping, and nighttime behaviors in wild and captive great apes. James R. Anderson, Mabel Y. L. Ang, Louise C. Lock, Iris Weiche. Primates, Apr 10 2019. https://link.springer.com/article/10.1007/s10329-019-00723-2
Abstract: The past few decades have seen a burgeoning of scientific studies on great apes’ use of nests for sleeping in the wild, as well as their nesting behavior and sleep in captivity. We review recent advances in knowledge of these topics, with the aim of promoting information exchange between people working in the field and with captive great apes. We trace developments in research into nest-building techniques in adults and immatures, factors that influence selection of general sleeping sites and specific locations, social aspects of sleep, postures, and nighttime activities. We argue that exchanges of information deriving from studies of captive and wild apes are valuable for obtaining a better understanding of sleep-related adaptations in our nearest evolutionary neighbors, and conclude by making some recommendations regarding sleeping arrangements in captivity from a welfare perspective.
Keywords: Chimpanzee Bonobo Gorilla Orangutan Nest building Sleep posture Sleep quality Environmental enrichment Welfare
Abstract: The past few decades have seen a burgeoning of scientific studies on great apes’ use of nests for sleeping in the wild, as well as their nesting behavior and sleep in captivity. We review recent advances in knowledge of these topics, with the aim of promoting information exchange between people working in the field and with captive great apes. We trace developments in research into nest-building techniques in adults and immatures, factors that influence selection of general sleeping sites and specific locations, social aspects of sleep, postures, and nighttime activities. We argue that exchanges of information deriving from studies of captive and wild apes are valuable for obtaining a better understanding of sleep-related adaptations in our nearest evolutionary neighbors, and conclude by making some recommendations regarding sleeping arrangements in captivity from a welfare perspective.
Keywords: Chimpanzee Bonobo Gorilla Orangutan Nest building Sleep posture Sleep quality Environmental enrichment Welfare
Wednesday, April 10, 2019
Why is age so important in human mating? Evolved age preferences and their influences on multiple mating behaviors
Conroy-Beam, D., & Buss, D. M. (2019). Why is age so important in human mating? Evolved age preferences and their influences on multiple mating behaviors. Evolutionary Behavioral Sciences, 13(2), 127-157. http://dx.doi.org/10.1037/ebs0000127
Abstract: Evolutionary theorizing suggests that chronological age, because it is so strongly linked with key reproductive qualities like fertility, should be an exceptionally consequential variable in mate selection. We review voluminous evidence for mate preferences for age and the substantial and varied behavioral sequelae of those preferences. These include (a) in actual marriage decisions, men choose younger wives, and women choose older husbands, on average in all of the dozens of cultures studied; (b) in personal advertisements, men and women seek partners consistent with their expressed age preferences; (c) chronological age determines number of “hits” received in online dating services; (d) the age of potential bride influences the amount of money spent on premarriage customs; (e) men’s mate retention effort, including commitment manipulation, resource provisioning, and intrasexual threats, is significantly predicted by the wife’s age; and (f) chronological age is an important sex-linked cause of divorce. The far-reaching ramifications of age also extend to (g) tactics of intrasexual competition, (h) predictors of mate value discrepancies, (i) victims of sex crimes, and (j) prostitution patterns. Finally, chronological age predicts (k) probability of remarriage, and (l) the age gap between grooms and brides upon remarriage. We synthesize evidence from diverse methods, across different cultures, and over time spans of centuries. Massive converging evidence provides a powerful, yet complex, understanding of the evolutionary importance of age in multiple mating outcomes over the human life span.
Popular version: What We Know About Age Gaps in Dating, Love, and Marriage. Theresa E DiDonato. Psychology Today, Apr 10, 2019. https://www.psychologytoday.com/ca/blog/meet-catch-and-keep/201904/what-we-know-about-age-gaps-in-dating-love-and-marriage
Abstract: Evolutionary theorizing suggests that chronological age, because it is so strongly linked with key reproductive qualities like fertility, should be an exceptionally consequential variable in mate selection. We review voluminous evidence for mate preferences for age and the substantial and varied behavioral sequelae of those preferences. These include (a) in actual marriage decisions, men choose younger wives, and women choose older husbands, on average in all of the dozens of cultures studied; (b) in personal advertisements, men and women seek partners consistent with their expressed age preferences; (c) chronological age determines number of “hits” received in online dating services; (d) the age of potential bride influences the amount of money spent on premarriage customs; (e) men’s mate retention effort, including commitment manipulation, resource provisioning, and intrasexual threats, is significantly predicted by the wife’s age; and (f) chronological age is an important sex-linked cause of divorce. The far-reaching ramifications of age also extend to (g) tactics of intrasexual competition, (h) predictors of mate value discrepancies, (i) victims of sex crimes, and (j) prostitution patterns. Finally, chronological age predicts (k) probability of remarriage, and (l) the age gap between grooms and brides upon remarriage. We synthesize evidence from diverse methods, across different cultures, and over time spans of centuries. Massive converging evidence provides a powerful, yet complex, understanding of the evolutionary importance of age in multiple mating outcomes over the human life span.
Popular version: What We Know About Age Gaps in Dating, Love, and Marriage. Theresa E DiDonato. Psychology Today, Apr 10, 2019. https://www.psychologytoday.com/ca/blog/meet-catch-and-keep/201904/what-we-know-about-age-gaps-in-dating-love-and-marriage
Those with posttraumatic stress disorder frequently experience unwanted memories of their traumas, even when making explicit efforts to avoid them, while healthy individuals can suppress those memories
Behavioral and neural correlates of memory suppression in PTSD. Danielle R. Sullivan et al. Journal of Psychiatric Research, Volume 112, May 2019, Pages 30-37. https://doi.org/10.1016/j.jpsychires.2019.02.015
Highlights
• Trauma exposure is associated with behavioral difficulties in memory suppression.
• Right middle frontal gyrus activity is reduced during memory suppression after trauma exposure.
• Trait suppression is negatively correlated with reduced right middle frontal gyrus activity.
Abstract: Previous work has shown that healthy individuals can actively suppress emotional memories through recruitment of the lateral prefrontal cortex. By contrast, individuals with posttraumatic stress disorder (PTSD) frequently experience unwanted memories of their traumatic experiences, even when making explicit efforts to avoid them. However, little is known regarding the behavioral and neural effects of memory suppression among individuals with PTSD. We examined memory suppression associated with PTSD using the Think-No-Think paradigm in an event-related functional magnetic resonance imaging (fMRI) study. We studied three groups: PTSD (n = 16), trauma exposure without PTSD (n = 19), and controls (i.e., no trauma exposure or PTSD; n = 13). There was a main effect of memory suppression such that participants remembered fewer face-picture pairs during the suppress condition than the remember condition. However, trauma-exposed participants (regardless of PTSD status) were less likely to successfully suppress memory than non-trauma-exposed controls. Neuroimaging data revealed that trauma-exposed individuals showed reduced activation in the right middle frontal gyrus during memory suppression. These results suggest that trauma exposure is associated with neural and behavioral disruptions in memory suppression and point to the possibility that difficulty in active suppression of memories may be just one of several likely factors contributing to the development of PTSD.
Highlights
• Trauma exposure is associated with behavioral difficulties in memory suppression.
• Right middle frontal gyrus activity is reduced during memory suppression after trauma exposure.
• Trait suppression is negatively correlated with reduced right middle frontal gyrus activity.
Abstract: Previous work has shown that healthy individuals can actively suppress emotional memories through recruitment of the lateral prefrontal cortex. By contrast, individuals with posttraumatic stress disorder (PTSD) frequently experience unwanted memories of their traumatic experiences, even when making explicit efforts to avoid them. However, little is known regarding the behavioral and neural effects of memory suppression among individuals with PTSD. We examined memory suppression associated with PTSD using the Think-No-Think paradigm in an event-related functional magnetic resonance imaging (fMRI) study. We studied three groups: PTSD (n = 16), trauma exposure without PTSD (n = 19), and controls (i.e., no trauma exposure or PTSD; n = 13). There was a main effect of memory suppression such that participants remembered fewer face-picture pairs during the suppress condition than the remember condition. However, trauma-exposed participants (regardless of PTSD status) were less likely to successfully suppress memory than non-trauma-exposed controls. Neuroimaging data revealed that trauma-exposed individuals showed reduced activation in the right middle frontal gyrus during memory suppression. These results suggest that trauma exposure is associated with neural and behavioral disruptions in memory suppression and point to the possibility that difficulty in active suppression of memories may be just one of several likely factors contributing to the development of PTSD.
We see evidence of an evolutionary design supportive of attachment as well as reproductive exigencies of procreative well-being; there is an ethological case to be made for considering pornography use as a public health risk
Procreative well-being and pornography – analyzing the script. Public health implications revealed through an ethological lens. Mark H. Butler.Marriage & Family Review, Apr 9 2019. https://doi.org/10.1080/01494929.2019.1588187
Abstract: An ethological model of human procreative well-being is proposed and the goodness-of-fit of pornography’s script to that model is considered. Deducing an evolutionary template for procreative well-being from an ethological analysis links attachment dynamics to procreative success. Alongside parent–child attachment, pair-bond attachment in the procreative couple looms large as an element of optimal procreative relationship structure and quality. Key elements of pair-bond attachment are documented. Turning next to an empirical examination of the sexual behavioral system in humans, we see evidence of an evolutionary design supportive of attachment as well as reproductive exigencies of procreative well-being. Sexual system mechanisms promoting both reproduction and attachment are evident in the evolutionary design. We next employ script theory to identify key elements of the sexual script promulgated by pornography. Joining these two analyses, we compare the evolutionary, attachment-based template for procreative success in juxtaposition to pornography’s sexual script to evaluate the goodness-of-fit of pornography use to attachment success and, by extension, procreative well-being. We conclude that there is an ethological case to be made for considering pornography use as a public health risk. Implications of the model of procreative well-being for the practice of couple therapy are given mention.
Keywords: attachment, ethology, family, marriage, pornography, procreative well-being, sexual behavioral system, sociobiology
Abstract: An ethological model of human procreative well-being is proposed and the goodness-of-fit of pornography’s script to that model is considered. Deducing an evolutionary template for procreative well-being from an ethological analysis links attachment dynamics to procreative success. Alongside parent–child attachment, pair-bond attachment in the procreative couple looms large as an element of optimal procreative relationship structure and quality. Key elements of pair-bond attachment are documented. Turning next to an empirical examination of the sexual behavioral system in humans, we see evidence of an evolutionary design supportive of attachment as well as reproductive exigencies of procreative well-being. Sexual system mechanisms promoting both reproduction and attachment are evident in the evolutionary design. We next employ script theory to identify key elements of the sexual script promulgated by pornography. Joining these two analyses, we compare the evolutionary, attachment-based template for procreative success in juxtaposition to pornography’s sexual script to evaluate the goodness-of-fit of pornography use to attachment success and, by extension, procreative well-being. We conclude that there is an ethological case to be made for considering pornography use as a public health risk. Implications of the model of procreative well-being for the practice of couple therapy are given mention.
Keywords: attachment, ethology, family, marriage, pornography, procreative well-being, sexual behavioral system, sociobiology
Long-term benefit of Microbiota Transfer Therapy on autism symptoms and gut/fecal microbiota
Long-term benefit of Microbiota Transfer Therapy on autism symptoms and gut microbiota. Dae-Wook Kang, James B. Adams, Devon M. Coleman, Elena L. Pollard, Juan Maldonado, Sharon McDonough-Means, J. Gregory Caporaso & Rosa Krajmalnik-Brown. Scientific Reports, volume 9, Article number: 5821 (2019). Apr 9. https://www.nature.com/articles/s41598-019-42183-0
Abstract: Many studies have reported abnormal gut microbiota in individuals with Autism Spectrum Disorders (ASD), suggesting a link between gut microbiome and autism-like behaviors. Modifying the gut microbiome is a potential route to improve gastrointestinal (GI) and behavioral symptoms in children with ASD, and fecal microbiota transplant could transform the dysbiotic gut microbiome toward a healthy one by delivering a large number of commensal microbes from a healthy donor. We previously performed an open-label trial of Microbiota Transfer Therapy (MTT) that combined antibiotics, a bowel cleanse, a stomach-acid suppressant, and fecal microbiota transplant, and observed significant improvements in GI symptoms, autism-related symptoms, and gut microbiota. Here, we report on a follow-up with the same 18 participants two years after treatment was completed. Notably, most improvements in GI symptoms were maintained, and autism-related symptoms improved even more after the end of treatment. Important changes in gut microbiota at the end of treatment remained at follow-up, including significant increases in bacterial diversity and relative abundances of Bifidobacteria and Prevotella. Our observations demonstrate the long-term safety and efficacy of MTT as a potential therapy to treat children with ASD who have GI problems, and warrant a double-blind, placebo-controlled trial in the future.
Abstract: Many studies have reported abnormal gut microbiota in individuals with Autism Spectrum Disorders (ASD), suggesting a link between gut microbiome and autism-like behaviors. Modifying the gut microbiome is a potential route to improve gastrointestinal (GI) and behavioral symptoms in children with ASD, and fecal microbiota transplant could transform the dysbiotic gut microbiome toward a healthy one by delivering a large number of commensal microbes from a healthy donor. We previously performed an open-label trial of Microbiota Transfer Therapy (MTT) that combined antibiotics, a bowel cleanse, a stomach-acid suppressant, and fecal microbiota transplant, and observed significant improvements in GI symptoms, autism-related symptoms, and gut microbiota. Here, we report on a follow-up with the same 18 participants two years after treatment was completed. Notably, most improvements in GI symptoms were maintained, and autism-related symptoms improved even more after the end of treatment. Important changes in gut microbiota at the end of treatment remained at follow-up, including significant increases in bacterial diversity and relative abundances of Bifidobacteria and Prevotella. Our observations demonstrate the long-term safety and efficacy of MTT as a potential therapy to treat children with ASD who have GI problems, and warrant a double-blind, placebo-controlled trial in the future.
From 2018: Concern for Group Reputation Increases Prosociality in Young Children
From 2018: Concern for Group Reputation Increases Prosociality in Young Children. Jan M. Engelmann, Esther Herrmann, Michael Tomasello. Psychol Sci. 2018 Feb;29(2):181-190. doi: 10.1177/0956797617733830
Abstract: The motivation to build and maintain a positive personal reputation promotes prosocial behavior. But individuals also identify with their groups, and so it is possible that the desire to maintain or enhance group reputation may have similar effects. Here, we show that 5-year-old children actively invest in the reputation of their group by acting more generously when their group’s reputation is at stake. Children shared significantly more resources with fictitious other children not only when their individual donations were public rather than private but also when their group’s donations (effacing individual donations) were public rather than private. These results provide the first experimental evidence that concern for group reputation can lead to higher levels of prosociality.
Keywords: cooperation, reputation, group reputation, open data
Check also Botto, Sara Valencia, & Rochat, Philippe. (2018). Sensitivity to the evaluation of others emerges by 24 months. Developmental Psychology, 54(9), 1723-1734. https://www.bipartisanalliance.com/2018/08/children-reproduced-outcomes-that-were.html
Abstract: The motivation to build and maintain a positive personal reputation promotes prosocial behavior. But individuals also identify with their groups, and so it is possible that the desire to maintain or enhance group reputation may have similar effects. Here, we show that 5-year-old children actively invest in the reputation of their group by acting more generously when their group’s reputation is at stake. Children shared significantly more resources with fictitious other children not only when their individual donations were public rather than private but also when their group’s donations (effacing individual donations) were public rather than private. These results provide the first experimental evidence that concern for group reputation can lead to higher levels of prosociality.
Keywords: cooperation, reputation, group reputation, open data
Check also Botto, Sara Valencia, & Rochat, Philippe. (2018). Sensitivity to the evaluation of others emerges by 24 months. Developmental Psychology, 54(9), 1723-1734. https://www.bipartisanalliance.com/2018/08/children-reproduced-outcomes-that-were.html
Angry people are more likely to engage in debates with those of similar & opposing views, & seek out information confirming their views more frequently; anxious individuals tend to seek out information contradicting their opinions
Anger, Fear, and Echo Chambers: The Emotional Basis for Online Behavior. Dag Wollebæk et al. Social Media + Society, April 9, 2019. https://doi.org/10.1177/2056305119829859
Abstract: Emotions, such as anger and fear, have been shown to influence people’s political behavior. However, few studies link emotions specifically to how people debate political issues and seek political information online. In this article, we examine how anger and fear are related to politics-oriented digital behavior, attempting to bridge the gap between the thus far disconnected literature on political psychology and the digital media. Based on survey data, we show that anger and fear are connected to distinct behaviors online. Angry people are more likely to engage in debates with people having both similar and opposing views. They also seek out information confirming their views more frequently. Anxious individuals, by contrast, tend to seek out information contradicting their opinions. These findings reiterate predictions made in the extant literature concerning the role of emotions in politics. Thus, we argue that anger reinforces echo chamber dynamics and trench warfare dynamics in the digital public sphere, while fear counteracts these dynamics.
Keywords: emotions, echo chambers, trench warfare dynamics, anger, anxiety, online political behavior
Abstract: Emotions, such as anger and fear, have been shown to influence people’s political behavior. However, few studies link emotions specifically to how people debate political issues and seek political information online. In this article, we examine how anger and fear are related to politics-oriented digital behavior, attempting to bridge the gap between the thus far disconnected literature on political psychology and the digital media. Based on survey data, we show that anger and fear are connected to distinct behaviors online. Angry people are more likely to engage in debates with people having both similar and opposing views. They also seek out information confirming their views more frequently. Anxious individuals, by contrast, tend to seek out information contradicting their opinions. These findings reiterate predictions made in the extant literature concerning the role of emotions in politics. Thus, we argue that anger reinforces echo chamber dynamics and trench warfare dynamics in the digital public sphere, while fear counteracts these dynamics.
Keywords: emotions, echo chambers, trench warfare dynamics, anger, anxiety, online political behavior
Genetic selection/concentration is not an explanation for neighbourhood gradients in obesity & mental health problems; a modest genetic selection/concentration was evident for teen pregnancy and poor educational outcomes
Genetics and the geography of health, behaviour and attainment. Daniel W. Belsky, Avshalom Caspi, Louise Arseneault, David L. Corcoran, Benjamin W. Domingue, Kathleen Mullan Harris, Renate M. Houts, Jonathan S. Mill, Terrie E. Moffitt, Joseph Prinz, Karen Sugden, Jasmin Wertz, Benjamin Williams & Candice L. Odgers. Nature Human Behaviour (2019), April 8 2019, https://www.nature.com/articles/s41562-019-0562-1
Abstract: Young people’s life chances can be predicted by characteristics of their neighbourhood1. Children growing up in disadvantaged neighbourhoods exhibit worse physical and mental health and suffer poorer educational and economic outcomes than children growing up in advantaged neighbourhoods. Increasing recognition that aspects of social inequalities tend, in fact, to be geographical inequalities2,3,4,5 is stimulating research and focusing policy interest on the role of place in shaping health, behaviour and social outcomes. Where neighbourhood effects are causal, neighbourhood-level interventions can be effective. Where neighbourhood effects reflect selection of families with different characteristics into different neighbourhoods, interventions should instead target families or individuals directly. To test how selection may affect different neighbourhood-linked problems, we linked neighbourhood data with genetic, health and social outcome data for >7,000 European-descent UK and US young people in the E-Risk and Add Health studies. We tested selection/concentration of genetic risks for obesity, schizophrenia, teen pregnancy and poor educational outcomes in high-risk neighbourhoods, including genetic analysis of neighbourhood mobility. Findings argue against genetic selection/concentration as an explanation for neighbourhood gradients in obesity and mental health problems. By contrast, modest genetic selection/concentration was evident for teen pregnancy and poor educational outcomes, suggesting that neighbourhood effects for these outcomes should be interpreted with care.
Abstract: Young people’s life chances can be predicted by characteristics of their neighbourhood1. Children growing up in disadvantaged neighbourhoods exhibit worse physical and mental health and suffer poorer educational and economic outcomes than children growing up in advantaged neighbourhoods. Increasing recognition that aspects of social inequalities tend, in fact, to be geographical inequalities2,3,4,5 is stimulating research and focusing policy interest on the role of place in shaping health, behaviour and social outcomes. Where neighbourhood effects are causal, neighbourhood-level interventions can be effective. Where neighbourhood effects reflect selection of families with different characteristics into different neighbourhoods, interventions should instead target families or individuals directly. To test how selection may affect different neighbourhood-linked problems, we linked neighbourhood data with genetic, health and social outcome data for >7,000 European-descent UK and US young people in the E-Risk and Add Health studies. We tested selection/concentration of genetic risks for obesity, schizophrenia, teen pregnancy and poor educational outcomes in high-risk neighbourhoods, including genetic analysis of neighbourhood mobility. Findings argue against genetic selection/concentration as an explanation for neighbourhood gradients in obesity and mental health problems. By contrast, modest genetic selection/concentration was evident for teen pregnancy and poor educational outcomes, suggesting that neighbourhood effects for these outcomes should be interpreted with care.
Tuesday, April 9, 2019
We construct more precise and robust measures of GDP per capita using nighttime lights; we find that GDP per capita measures are less precise for middle and low income countries
Illuminating Economic Growth. Yingyao Hu, Jiaxiong Yao. IMF Working Paper No. 19/77. https://www.imf.org/en/Publications/WP/Issues/2019/04/09/Illuminating-Economic-Growth-46670
Summary: This paper seeks to illuminate the uncertainty in official GDP per capita measures using auxiliary data. Using satellite-recorded nighttime lights as an additional measurement of true GDP per capita, we provide a statistical framework, in which the error in official GDP per capita may depend on the country’s statistical capacity and the relationship between nighttime lights and true GDP per capita can be nonlinear and vary with geographic location. This paper uses recently developed results for measurement error models to identify and estimate the nonlinear relationship between nighttime lights and true GDP per capita and the nonparametric distribution of errors in official GDP per capita data. We then construct more precise and robust measures of GDP per capita using nighttime lights, official national accounts data, statistical capacity, and geographic locations. We find that GDP per capita measures are less precise for middle and low income countries and nighttime lights can play a bigger role in improving such measures.
Summary: This paper seeks to illuminate the uncertainty in official GDP per capita measures using auxiliary data. Using satellite-recorded nighttime lights as an additional measurement of true GDP per capita, we provide a statistical framework, in which the error in official GDP per capita may depend on the country’s statistical capacity and the relationship between nighttime lights and true GDP per capita can be nonlinear and vary with geographic location. This paper uses recently developed results for measurement error models to identify and estimate the nonlinear relationship between nighttime lights and true GDP per capita and the nonparametric distribution of errors in official GDP per capita data. We then construct more precise and robust measures of GDP per capita using nighttime lights, official national accounts data, statistical capacity, and geographic locations. We find that GDP per capita measures are less precise for middle and low income countries and nighttime lights can play a bigger role in improving such measures.
Space ‘colonization’ will take place and will likely be fully automated; space mining will be the primary goal of space colonies; automation may lead to a technological singularity
Why space colonization will be fully automated. Riccardo Campa, Konrad Szocik, Martin Braddock. Technological Forecasting and Social Change, April 8 2019. https://doi.org/10.1016/j.techfore.2019.03.021
Highlights
• Humans cannot survive for long periods of time in outer space.
• Space ‘colonization’ will take place and will likely be fully automated.
• Space mining will be the primary goal of space colonies.
• Automation may lead to a technological singularity.
• Space automation could limit the negative effects of an hostile Superintelligence.
Abstract: In this article we explore a possible scenario of space colonization and its consequences for planet Earth. We argue that in the short term space colonization will take place, but not in the form often presented in scientific and science fiction literature. Space colonies will be fully automated. There are three main reasons to believe that this is the most plausible scenario: 1) space mining is very profitable; 2) humans cannot survive for long periods of time in outer space limiting the prospects for human space colonization (HSC), and 3) automation is already a leading trend on Earth. Crewed missions will have an ancillary function, while machines or human/machine avatars will ‘inhabit’ other celestial bodies, in order to pursue economic enterprises and progress scientific discovery. We also propose some considerations on the speculative hypothesis, elaborated by a few leading futurists, that the development of machine-based learning Artificial Intelligence would lead to the so-called Singularity. In relation to this scenario, we argue that fully automated space colonization (FASC) could be a solution to prevent unwanted side effects of the Singularity, such as competition for resources between humankind and a hostile Artificial Intelligence.
Highlights
• Humans cannot survive for long periods of time in outer space.
• Space ‘colonization’ will take place and will likely be fully automated.
• Space mining will be the primary goal of space colonies.
• Automation may lead to a technological singularity.
• Space automation could limit the negative effects of an hostile Superintelligence.
Abstract: In this article we explore a possible scenario of space colonization and its consequences for planet Earth. We argue that in the short term space colonization will take place, but not in the form often presented in scientific and science fiction literature. Space colonies will be fully automated. There are three main reasons to believe that this is the most plausible scenario: 1) space mining is very profitable; 2) humans cannot survive for long periods of time in outer space limiting the prospects for human space colonization (HSC), and 3) automation is already a leading trend on Earth. Crewed missions will have an ancillary function, while machines or human/machine avatars will ‘inhabit’ other celestial bodies, in order to pursue economic enterprises and progress scientific discovery. We also propose some considerations on the speculative hypothesis, elaborated by a few leading futurists, that the development of machine-based learning Artificial Intelligence would lead to the so-called Singularity. In relation to this scenario, we argue that fully automated space colonization (FASC) could be a solution to prevent unwanted side effects of the Singularity, such as competition for resources between humankind and a hostile Artificial Intelligence.
Male‐mediated prenatal loss can provide greater reproductive benefits to males than infanticide; compared to infanticide, male‐mediated prenatal loss may be more prevalent and of greater role in mammalian species than thought
Male‐mediated prenatal loss: Functions and mechanisms. Matthew N. Zipple et al. Evolutionary Anthropology: Issues, News, and Reviews, April 6 2019. https://doi.org/10.1002/evan.21776
ABSTRACT: Sexually selected infanticide has been the subject of intense empirical and theoretical study for decades; a related phenomenon, male‐mediated prenatal loss, has received much less attention in evolutionary studies. Male‐mediated prenatal loss occurs when inseminated or pregnant females terminate reproductive effort following exposure to a nonsire male, either through implantation failure or pregnancy termination. Male‐mediated prenatal loss encompasses two sub‐phenomena: sexually selected feticide and the Bruce effect. In this review, we provide a framework that explains the relationship between feticide and the Bruce effect and describes what is known about the proximate and ultimate mechanisms involved in each. Using a simple model, we demonstrate that male‐mediated prenatal loss can provide greater reproductive benefits to males than infanticide. We therefore suggest that, compared to infanticide, male‐mediated prenatal loss may be more prevalent in mammalian species and may have played a greater role in their social evolution than has previously been documented.
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Bruce Effect in Wikipedia:
ABSTRACT: Sexually selected infanticide has been the subject of intense empirical and theoretical study for decades; a related phenomenon, male‐mediated prenatal loss, has received much less attention in evolutionary studies. Male‐mediated prenatal loss occurs when inseminated or pregnant females terminate reproductive effort following exposure to a nonsire male, either through implantation failure or pregnancy termination. Male‐mediated prenatal loss encompasses two sub‐phenomena: sexually selected feticide and the Bruce effect. In this review, we provide a framework that explains the relationship between feticide and the Bruce effect and describes what is known about the proximate and ultimate mechanisms involved in each. Using a simple model, we demonstrate that male‐mediated prenatal loss can provide greater reproductive benefits to males than infanticide. We therefore suggest that, compared to infanticide, male‐mediated prenatal loss may be more prevalent in mammalian species and may have played a greater role in their social evolution than has previously been documented.
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Bruce Effect in Wikipedia:
Evolutionary benefits
Males
When given the opportunity, male mice tend to direct their urine in the female’s direction.[23] This allows males to improve their fitness success by “sabotaging” the pregnancy of a male competitor,[3] and more quickly returning the female to estrus.[24] The Bruce effect can also aid in maintaining social status, with dominant males leaving more urinal scent markings,[25] and so blocking the pregnancies initiated by subordinate males.Females
Females can control their likelihood of terminating pregnancy by pursuing or avoiding novel male contact during their most susceptible periods.[26] In this way, females can exert a post-copulatory mate choice, reserving their reproductive resources for the highest-quality male. Certainly, females are more likely to seek proximity to dominant males.[26] In many rodent species, males kill unrelated young; pregnancy block may avoid the wasted investment of gestating offspring likely to be killed at birth.[5][27] The Bruce effect is most common in polygynous rodent species, for which the risk of infanticide is highest.[28]
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