bluuebunny/crossref_metadata_2025 huggingface dataset:
Breaking up Romantic Relationships: Costs Experienced and Coping Strategies Deployed
Authors: Perilloux Carin , Buss David M.
Published: July 2015

This study examined differences between men and women, and between individuals experiencing rejection (Rejectees) and individuals doing the rejecting (Rejectors) in romantic relationship break-ups. We tested fourteen evolution-based predictions about romantic breakups using data from 193 participants; ten received support. Women more than men, for example, experienced costly sequelae such as the loss of a mate's physical protection and harmful post-breakup stalking by the ex-partner. Both men and women who were rejected, compared with those who did the rejecting, experienced more depression, loss of self-esteem, and rumination. Rejectors, on the other hand, experienced the reputational cost of being perceived by others as cruel. Exploratory data analyses revealed that women more than men reported experiencing negative emotions after a breakup, particularly feeling sad, confused, and scared. Both sexes used an array of strategies to cope with the breakup, ranging from high base-rate strategies such as discussing the breakup with friends to low base-rate strategies such as threatening suicide. The largest sex difference in coping strategies centered on the act of shopping, used by women Rejectors as well as women Rejectees, likely a strategy of appearance enhancement prior to reentering the mating market. Discussion focuses on the adaptive significance of sex differences and individual differences based on rejection status.
Young Adults Attempt Exchanges in Reproductively Relevant Currencies
Authors: Kruger Daniel J.
Published: July 2015

Adults in many species exhibit exchanges in reproductively relevant currencies, where males trade resources for sexual relations with females, and females have sex with males in exchange for provisioning. These exchanges can occur outside of a long-term partnership, which itself could be considered a commitment to the accessibility of reproductive currencies provided by each partner. The current study investigated whether young adults who are not in acute need of resources intentionally attempt reproductive currency exchanges outside of dating relationships or formal committed relationships such as marriage; and whether young adults have awareness of being the target of such attempts made by others. College students ( N = 475) completed a brief survey assessing their own attempts to exchange reproductively relevant currencies, as well as others' attempts to make these exchanges with them. Men were more likely to report making attempts to trade investment for sex and women were more likely to report attempted trades of sex for investment. Participants' experiences of exchange attempts initiated by other individuals mirrored these patterns. Men were more likely to report another individual trying to trade sex for their investment, and women were more likely to report another individual trying to trade investment for sex with them. The vast majority of these attempted exchanges took place outside of existing relationships, although a small portion did lead to short or long-term relationships.
Big Five Traits Related to Short-Term Mating: From Personality to Promiscuity across 46 Nations
Authors: Schmitt David P. , Shackelford Todd K.
Published: July 2015

As part of the International Sexuality Description Project, 13,243 participants from 46 nations responded to self-report measures of personality and mating behavior. Several traits showed consistent links with short-term mating. Extraversion positively correlated with interest in short-term mating, unrestricted sociosexuality, having engaged in short-term mate poaching attempts, having succumbed to short-term poaching attempts of others, and lacking relationship exclusivity. Low levels of agreeableness and conscientiousness also related to short-term mating, especially with extra-pair mating. Neuroticism and openness were associated with short-term mating as well, but these links were less consistent across sex and nation. Nation-level links between personality and sexuality replicated within-region findings, such as the strong association between national extraversion and national sociosexuality. Discussion focuses on the origins of personality-sexuality links and their implications across nations.
Task Selection is Critical for the Demonstration of Reciprocal Patterns of Sex Differences in Hand/Arm Motor Control and Near/Far Visual Processing
Authors: Sanders Geoff , Madden Anya , Thorpe Gemma
Published: July 2015

Women have been reported to perform better with hand rather than arm movements ( Sanders and Walsh, 2007 ) and with visual stimuli in near rather than far space ( Sanders, Sinclair and Walsh, 2007 ). Men performed better with the arm and in far space. These reciprocal patterns of sex differences appear as Muscle*Sex and Space*Sex interactions. We investigated these claims using target cancellation tasks in which task difficulty was manipulated by varying target size or the number of distracters. In Study 1 we did not find the Muscle*Sex or the Space*Sex interaction. We argue that ballistic movement was too simple to reveal the Muscle*Sex interaction. However, a trend for the Space*Sex interaction suggested task difficulty was set too high. Study 2 introduced easier levels of difficulty and the overall Space*Sex interaction narrowly failed to reach significance ( p = 0.051). In Study 3 the Space*Sex interaction was significant ( p = 0.001). A review of the present, and four previously published, studies indicates that task selection is critical if the Space*Sex interaction and its associated reciprocal within-sex differences are to be demonstrated without the obscuring effects of Space and Difficulty. These sex differences are compatible with predictions from the hunter-gatherer hypothesis. Implications for two-visual-system-models are considered.
Showing Off in Humans: Male Generosity as a Mating Signal
Authors: Iredale Wendy , Van Vugt Mark , Dunbar Robin
Published: July 2015

We examined people's charity contributions while in the presence of an observer of the same sex, opposite sex, or no observer. Inspired by costly signaling theory, we hypothesized that men would be more generous in the presence of a potential mate. Men and women played a number of experimental games in which they could earn money. On completion of these games participants were asked what percentage of their earned money they would be willing to donate to charity. Our results show that men contribute more to charity when observed by a member of the opposite sex than by a member of the same sex or no observer. Conversely, female charity donations did not significantly vary across the three observer conditions. Findings support the notion that men's generosity might have evolved as a mating signal.
Parent-Offspring Conflict over Mating: The Case of Family Background
Authors: Apostolou Menelaos
Published: July 2015

In human societies the choice of a spouse is the outcome of individual mating choice and parental influence over mating. However, parents and offspring do not share identical interests with respect to mating. Accordingly, in order to understand this process it is necessary to examine the degree to which parents and offspring agree or disagree over mating choices. Trivers (1974) originally hypothesized that the two parties are in conflict over the family background of a mating candidate, with parents valuing this trait more than their offspring in a mating candidate. In this article this hypothesis is developed theoretically and empirically. It is proposed that that historically a preference for good family background increased the fitness of the parents more than the fitness of their offspring. Using a sample of 305 parents, the hypothesis is tested that good family background is preferred more in an in-law than in a spouse. The results from this study provide support for this hypothesis.
The Effects of Perceived Anonymity on Altruistic Punishment
Authors: Piazza Jared , Bering Jesse M.
Published: July 2015

Previous studies investigating altruistic punishment have confounded the effects of two independent variables: information transmission (or breach of privacy) and personal identification (or breach of anonymity). Here we report findings from a brief study in which participants were asked to respond to a social norm violation (i.e., an anonymous actor had behaved selfishly in an economic game) by deciding whether to sacrifice their own endowment to punish this person. A third of the participants were told that their economic decisions would be made known to another player but could not be identified (privacy breach condition), whereas another third were informed that their decision as well as their names would be made known (anonymity breach condition). (The decisions of control participants were completely anonymous and private.) Participants also justified their economic decisions and reported their emotional experiences. The results were participants punished most in the privacy and anonymity breach conditions and least in the control condition. These findings have implications for existing evolutionary accounts of altruistic punishment.
Human Vocabulary Use as Display
Authors: Rosenberg Jeremy , Tunney Richard J.
Published: July 2015

The average human vocabulary consists of approximately 20,000 word families, yet only 6000-7000 word families are required to understand most communication. One possible explanation for this level of redundancy is that vocabulary size is selected as a fitness indicator and is used for display. Human vocabulary size correlates highly with measurable intelligence and when choosing potential mates individuals actively prefer other correlates of intelligence, such as education. Here we show that males used more low frequency words after an imaginary romantic encounter with a young female shown in a photograph relative to when they viewed photographs of older females. Females used fewer low frequency words when they imagined a romantic encounter with a young male shown in a photograph relative to when they viewed photographs of older males. These differences in male and female vocabulary displays may be related to sex differences in investment costs in offspring.
Attracting Interest: Dynamic Displays of Proceptivity Increase the Attractiveness of Men and Women
Authors: Clark Andrew P.
Published: July 2015

Proceptive signals may influence judgments of opposite-sex attractiveness because these signals indicate high mate quality and/or non-threatening behavior but they may also signal high probable rate of return for mating effort. If so, individuals observing these signals may be sensitive to where the signals are directed to; signals directed toward other individuals may not predict what signals would be directed toward the observer. To explore these possibilities I made use of video stimuli composed of mock interviews with actors. Each actor did one proceptive and one unreceptive interview. Each interview was presented as being directed toward participants or toward an opposite sex interviewer. Proceptivity enhanced the attractiveness of opposite-sex actors and an interaction between proceptive state and signal direction was found, with this pattern varying substantially between actors. The possibility that this variation is mediated by the physical attractiveness and sex of the actors will be discussed.
Are Sexual and Emotional Infidelity Equally Upsetting to Men and Women? Making Sense of Forced-Choice Responses
Authors: Lishner David A. , Nguyen Shannon , Stocks E. L. , Zillmer Emily J.
Published: July 2015

Forced-choice measures that assess reactions to imagined sexual and emotional infidelity are ubiquitous in studies testing the Jealousy as a Specific Innate Module (JSIM) model. One potential problem with such measures is that they fail to identify respondents who find both forms of infidelity equally upsetting. To examine this issue, an experiment was conducted in which two groups of participants imagined a romantic infidelity after which participants in the first group used a traditional forced-choice measure to indicate whether they found sexual or emotional infidelity more upsetting. Participants in the second group instead used a modified forced-choice measure that allowed them also to indicate whether they found both forms of infidelity equally upsetting. Consistent with previous research, those given the traditional forced-choice measure tended to respond in a manner that supported the JSIM model. However, the majority of participants given the modified measure indicated that both forms of infidelity were equally upsetting.
Working Memory: A Cognitive Limit to Non-Human Primate Recursive Thinking Prior to Hominid Evolution
Authors: Read Dwight W.
Published: July 2015

In this paper I explore the possibility that recursion is not part of the cognitive repertoire of non-human primates such as chimpanzees due to limited working memory capacity. Multiple lines of data, from nut cracking to the velocity and duration of cognitive development, imply that chimpanzees have a short-term memory size that limits working memory to dealing with two, or at most three, concepts at a time. If so, as a species they lack the cognitive capacity for recursive thinking to be integrated into systems of social organization and communication. If this limited working memory capacity is projected back to a common ancestor for Pan and Homo, it follows that early hominid ancestors would have had limited working memory capacity. Hence we should find evidence for expansion of working memory capacity during hominid evolution reflected in changes in the products of conceptually framed activities such as stone tool production. Data on the artifacts made by our hominid ancestors support this expansion hypothesis for hominid working memory, thereby leading to qualitative differences between Pan and Homo.
Hierarchy in the Library: Egalitarian Dynamics in Victorian Novels
Authors: Johnson John A. , Carroll Joseph , Gottschall Jonathan , Kruger Daniel
Published: July 2015

The current research investigated the psychological differences between protagonists and antagonists in literature and the impact of these differences on readers. It was hypothesized that protagonists would embody cooperative motives and behaviors that are valued by egalitarian hunter-gatherers groups, whereas antagonists would demonstrate status-seeking and dominance behaviors that are stigmatized in such groups. This hypothesis was tested with an online questionnaire listing characters from 201 canonical British novels of the longer nineteenth century. 519 respondents generated 1470 protocols on 435 characters. Respondents identified the characters as protagonists, antagonists, or minor characters, judged the characters' motives according to human life history theory, rated the characters' traits according to the five-factor model of personality, and specified their own emotional responses to the characters on categories adapted from Ekman's seven basic emotions. As expected, antagonists are motivated almost exclusively by the desire for social dominance, their personality traits correspond to this motive, and they elicit strongly negative emotional responses from readers. Protagonists are oriented to cooperative and affiliative behavior and elicit positive emotional responses from readers. Novels therefore apparently enable readers to participate vicariously in an egalitarian social dynamic like that found in hunter-gatherer societies. We infer that agonistic structure in novels simulates social behaviors that fulfill an adaptive social function and perhaps stimulates impulses toward these behaviors in real life.
Social Inclusion Facilitates Interest in Mating
Authors: Brown Christina M. , Young Steven G. , Sacco Donald F. , Bernstein Michael J. , Claypool Heather M.
Published: July 2015

According to a life history framework, variability across an organism's lifespan necessitates trade-offs between behaviors that promote survival and those that promote reproduction. Adopting this perspective, the current work investigates how social acceptance or rejection can influence the differential priority placed on mating and survival motivations. Because social acceptance is an important survival-related cue (i.e., group living provides protection from predators and sharing of resources), we predicted that recent experiences of social acceptance should increase people's motivation to mate. In support of this prediction, Study 1 found that participants who were included in an electronic ball-toss game showed more interest in mating (regardless of the potential mate's attractiveness) than excluded and control participants. In Study 2, participants who recalled an experience of social acceptance viewed sexual affiliation as more important than did participants in rejection and control conditions. Collectively, these results suggest an adaptive trade-off such that interest in mating increases upon satiation of affiliative needs. Furthermore, these findings demonstrate that the experience of social acceptance can have unique effects and should not be treated as the sole comparison condition when studying social rejection.
Tearing: Breakthrough in Human Emotional Signaling
Authors: Provine Robert R. , Krosnowski Kurt A. , Brocato Nicole W.
Published: July 2015

Tearing is not a benign secretory correlate of sadness or other emotional state, but a potent visual cue that adds meaning to human facial expression, the tear effect. Although tearing (lacrimation) provides ocular lubrication and is a response to irritation in many animals, emotional tearing may be unique to humans and does not develop until several months after birth. This study provides the first experimental demonstration that tears are a visual signal of sadness by contrasting the perceived sadness of human facial images with tears against copies of those images that had the tears digitally removed. Tear removal produced faces rated as less sad. Anecdotal findings suggest further that tear-removal often produced faces of uncertain emotional valence, perhaps awe, concern, or puzzlement, not just less sad. Tearing signaled sadness and resolved ambiguity. The evolution and development of emotional tearing in humans provide a novel, potent and neglected channel of affective communication.
The Influence of Social Category and Reciprocity on Adults' and Children's Altruistic Behavior
Authors: Gummerum Michaela , Takezawa Masanori , Keller Monika
Published: July 2015

Evolutionary theories of altruism have suggested that reciprocal exchanges and ingroup favoritism have been important strategies leading to the evolution of altruistic behavior among strangers. This study investigates whether minimal information about an interaction partner's membership in a trivial social group affects the allocations of adults and children in dictator game, reciprocity in a sequential prisoner's dilemma, and altruistic punishment in a third-party punishment game. In all, 155 adults and 157 students from second and sixth grade played these three economic games in either an ingroup, outgroup, or neutral condition. Adults and sixth-grade children allocated more to ingroup than to outgroup receivers in the dictator game, and adults punished ingroup non-cooperators more in the third-party punishment game than outgroup non-cooperators. When additional information about the other player's past behavior was presented, adults reciprocated equally with ingroup, outgroup, and neutral players, whereas children from sixth grade reciprocated more with ingroup and neutral than with outgroup players. Overall, the results of this study support the importance of group membership and reciprocity for adults' and older elementary school children's altruistic behavior. For younger elementary school children, however, reciprocity and group membership do not serve as salient social information that influence their altruistic behavior.
Structural Relations among Negative Affect, Mate Value, and Mating Effort
Authors: Kirsner Beth Randi , Figueredo Aurelio José , Jacobs W. Jake
Published: July 2015

We compared the ability of models based on evolutionary economic theory and Life History (LH) Theory to explain relations among self-reported negative affect, mate value, and mating effort. Method: Two hundred thirty-eight undergraduates provided multiple measures of these latent constructs, permitting us to test a priori predictions based on Kirsner, Figueredo, and Jacobs (2003) . We compared the fit of the initial model to the fit of five alternative theory-driven models using nested model comparisons of Structural Equations Models. Rejecting less parsimonious and explanatory models eliminated the original model. Two equally parsimonious models explained the data pattern well. The first, based on evolutionary economic theory, specified that Negative Affect increases both Personal Mate Value and Mating Effort via the direct effects specified in the original model. The second, based on LH Theory, specified that Negative Affect, Personal Mate Value, and Mating Effort relate spuriously through a common latent construct, the LH Factor. The primary limitation of the present study is generalizability. We used self-reports taken from a young, university-based sample that included a spectrum of affective states. We cannot know how well these models generalize to an older population or to actual behavior. Both models predict the presence of a rich pattern of mate acquisition and retention behaviors, including an alarming set of behavioral tactics often not considered or targeted during treatment. Moreover, each model suggests a unique set of problems may arise after an effective intervention. We describe several ways to distinguish these models empirically.
Effects of Context and Relative Rank on Mate Choice and Affiliation Ratings
Authors: Honey P. Lynne , Coulombe Chad D.
Published: July 2015

Female dominance has not often been studied as a factor in mate choice and other social interactions. When it has been examined, there have been a number of conflicting findings. The present study was designed to clarify interpretations of a study conducted by Brown and Lewis (2004) that found that men prefer subordinate women in a workplace context. We presented participants with information about the relative rank of physically attractive targets, in two very different contexts (work-related and recreational). We found that the context in which rank cues are presented has an impact on affiliation ratings, but that cues of rank do not affect mate choice ratings. Future studies of effects of dominance must take into account the context in which they are presented, and recognize that rank may not be a sufficient indicator of dominance for the purpose of mate choice by both men and women.
Height, Relationship Satisfaction, Jealousy, and Mate Retention
Authors: Brewer Gayle , Riley Charlene
Published: July 2015

Male height is associated with high mate value. In particular, tall men are perceived as more attractive, dominant and of a higher status than shorter rivals, resulting in a greater lifetime reproductive success. Female infidelity and relationship dissolution may therefore present a greater risk to short men. It was predicted that tall men would report greater relationship satisfaction and lower jealousy and mate retention behavior than short men. Ninety eight heterosexual men in a current romantic relationship completed a questionnaire. Both linear and quadratic relationships were found between male height and relationship satisfaction, cognitive and behavioral jealousy. Tall men reported greater relationship satisfaction and lower levels of cognitive or behavioral jealousy than short men. In addition, linear and quadratic relationships were found between male height and a number of mate retention behaviors. Tall and short men engaged in different mate retention behaviors. These findings are consistent with previous research conducted in this area detailing the greater attractiveness of tall men.
Impact of Relational Proximity on Distress from Infidelity
Authors: Fisher Maryanne , Cox Anthony , Tran Ulrich S. , Hoben Ashley , Geher Glenn , Arrabaca Andrew , Chaize Corinna , Dietrich Robert , Voracek Martin
Published: July 2015

Men are generally more distressed by a partner's sexual infidelity whereas women are generally more distressed by a partner's emotional infidelity. The importance of the identity of the interloper, however, has been neglected. We explored the influence of relational proximity (i.e., the degree of genetic relatedness) on distress about infidelity. In Study 1, participants were most distressed when the imagined infidelity occurred between their current mate and close kin. In Study 2, relational proximity mattered more than the type of sexual behavior, the likelihood of contracting a sexually transmitted disease, and the likelihood of the infidelity leading to a damaged reputation. Together, the results indicate that identity matters, especially if the interloper is someone with whom we have familial bonds.
Life History Strategy and Disordered Eating Behavior
Authors: Salmon Catherine , Figueredo Aurelio José , Woodburn Lindsey
Published: July 2015

A sample of female undergraduates completed a packet of questionnaires consisting of the Arizona Life History Battery, a modified version of the Eating Disorders Inventory, the Behavioral Regulation scales from the Behavior Rating Inventory of Executive Function, and two measures of Female Intrasexual Competitiveness that distinguished between competition for mates and competition for status. As predicted, Executive Functions completely mediated the relation between Slow Life History Strategy and Disordered Eating Behavior. Surprisingly, however, the relation between Female Intrasexual Competitiveness (competition for mates and competition for status) and Disordered Eating Behavior was completely spurious, with executive functions serving as a common cause underlying the inhibition of both Disordered Eating Behavior and Female Intrasexual Competitiveness. The protective function of Slow Life History Strategy with respect to Disordered Eating Behavior apparently resides in a higher degree of Behavioral Regulation, a type of Executive Function. The enhanced Behavioral Regulation or self-control, of individuals with a Slow Life History Strategy is also protective against hazardously escalated levels of Female Intrasexual Competitiveness.
The Role of Human Body Movements in Mate Selection
Authors: Hugill Nadine , Fink Bernhard , Neave Nick
Published: July 2015

It is common scientific knowledge, that most of what we say within a conversation is not only expressed by the words' meaning alone, but also through our gestures, postures, and body movements. This non-verbal mode is possibly rooted firmly in our human evolutionary heritage, and as such, some scientists argue that it serves as a fundamental assessment and expression tool for our inner qualities. Studies of nonverbal communication have established that a universal, culture-free, non-verbal sign system exists, that is available to all individuals for negotiating social encounters. Thus, it is not only the kind of gestures and expressions humans use in social communication, but also the way these movements are performed, as this seems to convey key information about an individual's quality. Dance, for example, is a special form of movement, which can be observed in human courtship displays. Recent research suggests that people are sensitive to the variation in dance movements, and that dance performance provides information about an individual's mate quality in terms of health and strength. This article reviews the role of body movement in human non-verbal communication, and highlights its significance in human mate preferences in order to promote future work in this research area within the evolutionary psychology framework.
Maternal Guilt
Authors: Rotkirch Anna , Janhunen Kristiina
Published: July 2015

The recent emphasis on humans as cooperative breeders invites new research on human family dynamics. In this paper we look at maternal guilt as a consequence of conditional maternal investment. Solicited texts written by Finnish mothers with under school-aged children in 2007 ( n = 63) described maternal emotions perceived as difficult and forbidden. Content analysis of guilt-inducing situations showed that guilt arose from diverging interest and negotiations between the mother and child (i.e., classic parent-offspring conflict). Also cultural expectations of extensive and perpetual high-quality maternal investment or the “motherhood myth” induced guilt in mothers. We argue that guilt plays an important role in maternal-investment regulation. Maternal guilt is predicted to vary with social and cultural context but also to show universal characteristics due to parent-offspring conflict and allomaternal manipulation. Results are preliminary and intended to stimulate research into the mechanisms, gender differences and cultural variations of guilt and other social emotions in human parenting.
Preachers Who are Not Believers
Authors: Dennett Daniel C. , LaScola Linda
Published: July 2015

There are systemic features of contemporary Christianity that create an almost invisible class of non-believing clergy, ensnared in their ministries by a web of obligations, constraints, comforts, and community. Exemplars from five Protestant denominations, Southern Baptist, United Church of Christ, Presbyterian, Methodist and Church of Christ, were found and confidentially interviewed at length about their lives, religious education and indoctrination, aspirations, problems and ways of coping. The in-depth, qualitative interviews formed the basis for profiles of all five, together with general observations about their predicaments and how they got into them. The authors anticipate that the discussion generated on the Web (at On Faith, the Newsweek/Washington Post website on religion, http://newsweek.washingtonpost.com/onfaith//2010/03/disbelief_in_the_pulpit/all.html ) and on other websites will facilitate a larger study that will enable the insights of this pilot study to be clarified, modified, and expanded.
Handgrip Strength and Socially Dominant Behavior in Male Adolescents
Authors: Gallup Andrew C. , O'Brien Daniel T. , White Daniel D. , Wilson David Sloan
Published: July 2015

Handgrip strength (HGS) is highly heritable and a good overall measure of strength and muscle function. Indicative of blood testosterone levels and fat-free body mass, HGS is also highly sexually dimorphic. Recent psychological research shows that HGS is correlated with a number of social variables, but only in males. We conducted three studies to further investigate the relationship between HGS and measures of aggression and social competition among adolescents. Consistent with previous reports, correlations were almost exclusive to males, but this was only visible during late adolescence (i.e., high school). These findings support evolutionary hypotheses regarding grip strength in male-male competition and suggest that similar to measures of testosterone, HGS is a measure that is predictive of social behavior in older adolescent males.
Does the Brain Consume Additional Glucose during Self-Control Tasks?
Authors: Kurzban Robert
Published: July 2015

A currently popular model of self-control posits that the exertion of self-control relies on a resource, which is expended by acts of self-control, resulting in less of this resource being available for subsequent acts of self-control. Recently, glucose has been proposed as the resource in question. For this model to be correct, it must be the case that A) performing a self-control task reduces glucose levels relative to a control task and B) performing a self-control task reduces glucose relative to pre-task levels. Evidence from neurophysiology suggests that (A) is unlikely to be true, and the evidence surrounding (B) is mixed, and is unlikely to be true for subjects who have not recently fasted. From the standpoint of evolved function, glucose might better be thought of as an input to decision making systems rather than as a constraint on performance.
The Attention-Getting Capacity of Whines and Child-Directed Speech
Authors: Chang Rosemarie Sokol , Thompson Nicholas S.
Published: July 2015

The current study tested the ability of whines and child-directed speech to attract the attention of listeners involved in a story repetition task. Twenty non-parents and 17 parents were presented with two dull stories, each playing to a separate ear, and asked to repeat one of the stories verbatim. The story that participants were instructed to ignore was interrupted occasionally with the reader whining and using child-directed speech. While repeating the passage, participants were monitored for Galvanic skin response, heart rate, and blood pressure. Based on 4 measures, participants tuned in more to whining, and to a lesser extent child-directed speech, than neutral speech segments that served as a control. Participants, regardless of gender or parental status, made more mistakes when presented with the whine or child-directed speech, they recalled hearing those vocalizations, they recognized more words from the whining segment than the neutral control segment, and they exhibited higher Galvanic skin response during the presence of whines and child-directed speech than neutral speech segments. Whines and child-directed speech appear to be integral members of a suite of vocalizations designed to get the attention of attachment partners by playing to an auditory sensitivity among humans. Whines in particular may serve the function of eliciting care at a time when caregivers switch from primarily mothers to greater care from other caregivers.
Examining the Acceptance of and Resistance to Evolutionary Psychology
Authors: Fitzgerald Carey J. , Whitaker Mitchell B.
Published: July 2015

The field of psychology remains a divided one. Several different sub-disciplines (e.g., developmental, cognitive, behaviorism, social, etc.) form what could be a unified scientific area. However, there is no widely accepted theory of unification. Charles Darwin once theorized that evolutionary theory would change the foundation of psychology; but over the years, evolutionary psychology has been met with hostile resistance from some of the prominent psychologists within the other sub-disciplines. Yet in recent years, all of the divided sub-disciplines of psychology have been slowly implementing evolutionary principles into their literature and research. This slow integration of evolutionary psychology into the other sub-disciplines indicates the possibility of a unified psychology with evolution as its foundation. This paper briefly reviews the literature within each major sub-discipline of psychology to show their implementation of evolutionary psychological theories, indicating the possibility of evolutionary psychology becoming the unifying paradigm upon which the entire field of psychology can be based. A call for action to continue this process is also discussed.
Remembering Helpers and Hinderers Depends on Behavioral Intentions of the Agent and Psychopathic Characteristics of the Observer
Authors: Camilleri Joseph A. , Kuhlmeier Valerie A. , Chu Jenny Y. Y.
Published: July 2015

Individual differences in proneness towards granting benefits (i.e., helping) or imposing costs (i.e., hindering) may have led to processes that detect and remember people who are prone to help or hinder. We examined two factors that might influence such memory: the intentionality of the acts and individual differences in psychopathy characteristics. Participants viewed several videos of computer-animated agents that helped or hindered another agent, either intentionally or unintentionally. Afterward, participants had better memory for agents that acted intentionally. Additionally, participants with more psychopathic tendencies had enhanced memory for helpers, suggesting that certain individual characteristics might result in heightened memory for people who are prone to granting benefits.
Correlated Male Preferences for Femininity in Female Faces and Voices
Authors: Fraccaro Paul J , Feinberg David R , DeBruine Lisa M , Little Anthony C , Watkins Christopher D , Jones Benedict C
Published: July 2015

Sexually dimorphic physical traits are important for mate choice and mate preference in many species, including humans. Several previous studies have observed that women's preferences for physical cues of male masculinity in different domains (e.g., visual and vocal) are correlated. These correlations demonstrate systematic, rather than arbitrary, variation in women's preferences for masculine men and are consistent with the proposal that sexually dimorphic cues in different domains reflect a common underlying aspect of male quality. Here we present evidence for a similar correlation between men's preferences for different cues of femininity in women; although men generally preferred feminized to masculinized versions of both women's faces and voices, the strength of men's preferences for feminized versions of female faces was positively and significantly correlated with the strength of their preferences for feminized versions of women's voices. In a second study, this correlation occurred when men judged women's attractiveness as long-term, but not short-term, mates, which is consistent with previous research. Collectively, these findings (1) present novel evidence for systematic variation in men's preferences for feminine women, (2) present converging evidence for concordant preferences for sexually dimorphic traits in different domains, and (3) complement findings of correlations between women's facial and vocal femininity.
Altruism between Romantic Partners: Biological Offspring as a Genetic Bridge between Altruist and Recipient
Authors: Fitzgerald Carey J. , Thompson Matthew C. , Whitaker Mitchell B.
Published: July 2015

When the cost of altruism is low, individuals are more likely to help non-kin (i.e., friends and romantic partners) than kin. This trend is thought to reflect the fact that people tend to be emotionally closer with friends and romantic partners than kin. However, as the cost of altruism increases, altruistic preference shifts to kin. The present study highlights this phenomenon by examining altruism between siblings, romantic partners, romantic partners who have biological children together, and romantic partners who have adopted children together. Participants ( n = 203) completed a questionnaire about altruism in low-, medium-, and high-cost situations. Participants gave more low-cost help to their romantic partners (regardless of whether they had a child together) than their siblings. More medium-cost help was given to romantic partners who had a child (biological and adopted) than siblings and romantic partners without children. In the high-cost condition, the estimated altruistic tendencies were stronger toward siblings and romantic partners who have a biological child than toward romantic partners with no children and partners with adopted children. Participants also believed they were more altruistic than their siblings and romantic partners.
The Effect of Mortality Salience on Women's Judgments of Male Faces
Authors: Vaughn James E. , Bradley Kristopher I. , Byrd-Craven Jennifer , Kennison Shelia M.
Published: July 2015

Previous research has shown that individuals who are reminded of their death exhibited a greater desire for offspring than those who were not reminded of their death. The present research investigated whether being reminded of mortality affects mate selection behaviors, such as facial preference judgments. Prior research has shown that women prefer more masculine faces when they are at the high versus low fertility phase of their menstrual cycles. We report an experiment in which women were tested either at their high or fertility phase. They were randomly assigned to either a mortality salience (MS) or control condition and then asked to judge faces ranging from extreme masculine to extreme feminine. The results showed that women's choice of the attractive male face was determined by an interaction between fertility phase and condition. In control conditions, high fertility phase women preferred a significantly more masculine face than women who were in a lower fertility phase of their menstrual cycles. In MS conditions, high fertility phase women preferred a significantly less masculine (i.e., more average) face than women who were in a low fertility phase. The results indicate that biological processes, such as fertility phase, involved in mate selection are sensitive to current environmental factors, such as death reminders. This sensitivity may serve as an adaptive compromise when choosing a mate in potentially adverse environmental conditions.
Regional Differences in Pathogen Prevalence and Defensive Reactions to the “Swine Flu” Outbreak among East Asians and Westerners
Authors: Hamamura Takeshi , Park Justin H.
Published: July 2015

Research has found that contagion-minimizing behavioral tendencies are amplified in pathogen-prevalent regions. We investigated whether reactions to the “swine flu” outbreak of 2009 were stronger among East Asians than Westerners, populations residing in regions that now enjoy comparable advances in healthcare but that are characterized by relatively high and low historical pathogen prevalence, respectively. In a survey, East Asians reported greater concerns about infection, especially from foreigners. Analyses of international air travel data around the time of the outbreak provided corroborating evidence: Immediately following the outbreak, airports in the Asia-Pacific region lost more international traffic relative to their Western counterparts, and East Asian airlines reported greater declines in international traffic compared to Western airlines. These differences are unlikely to reflect objective threat posed by swine flu (whose casualties were concentrated in the Americas); rather, they appear to reflect culturally adapted behavioral patterns forged and sustained by regionally variable levels of pathogen prevalence.
Pair-Bonded Humans Conform to Sexual Stereotypes in Web-Based Advertisements for Extra-Marital Partners
Authors: Kelley Trish C. , Hare James F.
Published: July 2015

Partners advertisements provide advertisers with access to a large pool of prospective mates, and have proven useful in documenting sex differences in human mating preferences. We coded data from an Internet site ( AshleyMadison.com ) catering to advertisers engaged in existing pair-bonded relationships. While we predicted that pair-bonding may liberate advertisers from conforming to sexual stereotypes of male promiscuity and female choosiness, our results are uniformly consistent with those stereotypes. Our findings thus provide further evidence that human mating behavior is highly constrained by fundamental biological differences between males and females.
A New Viewpoint on the Evolution of Sexually Dimorphic Human Faces
Authors: Burke Darren , Sulikowski Danielle
Published: July 2015

Human faces show marked sexual shape dimorphism, and this affects their attractiveness. Humans also show marked height dimorphism, which means that men typically view women's faces from slightly above and women typically view men's faces from slightly below. We tested the idea that this perspective difference may be the evolutionary origin of the face shape dimorphism by having males and females rate the masculinity/femininity and attractiveness of male and female faces that had been manipulated in pitch (forward or backward tilt), simulating viewing the face from slightly above or below. As predicted, tilting female faces upwards decreased their perceived femininity and attractiveness, whereas tilting them downwards increased their perceived femininity and attractiveness. Male faces tilted up were judged to be more masculine, and tilted down judged to be less masculine. This suggests that sexual selection may have embodied this viewpoint difference into the actual facial proportions of men and women.
On the Adaptive Origins and Maladaptive Consequences of Human Inbreeding: Parasite Prevalence, Immune Functioning, and Consanguineous Marriage
Authors: Hoben Ashley D. , Buunk Abraham P. , Fincher Corey L. , Thornhill Randy , Schaller Mark
Published: July 2015

We propose that consanguineous marriages arise adaptively in response to high parasite prevalence and function to maintain coadapted gene complexes and associated local adaptation that defend against local pathogens. Therefore, a greater prevalence of inbreeding by consanguineous marriage is expected in geographical regions that historically have had high levels of disease-causing parasites. Eventually such marriages may, under the contemporary high movement of people with modern transportation, jeopardize the immunity of those who practice inbreeding as this leads to an increased susceptibility to novel pathogens. Therefore, a greater frequency of inbreeding is expected to predict higher levels of contemporary mortality and morbidity from infectious diseases. This parasite model of human inbreeding was supported by an analysis involving 72 countries worldwide. We found that historically high levels of pathogen prevalence were related positively to the proportion of consanguineous marriages, and that a higher prevalence of such marriages was associated with higher contemporary mortality and morbidity due to pathogens. Our study addresses plausible alternative explanations. The results suggest that consanguineous marriage is an adaptive consequence of historical pathogen ecologies, but is maladaptive in contemporary disease ecologies.
Toward an Integrative Approach of Cognitive Neuroscientific and Evolutionary Psychological Studies of Art
Authors: De Smedt Johan , De Cruz Helen
Published: July 2015

This paper examines explanations for human artistic behavior in two reductionist research programs, cognitive neuroscience and evolutionary psychology. Despite their different methodological outlooks, both approaches converge on an explanation of art production and appreciation as byproducts of normal perceptual and motivational cognitive skills that evolved in response to problems originally not related to art, such as the discrimination of salient visual stimuli and speech sounds. The explanatory power of this reductionist framework does not obviate the need for higher-level accounts of art from the humanities, such as aesthetics, art history or anthropology of art.
Emotional Faces Capture Spatial Attention in 5-Year-Old Children
Authors: Elam Kit K. , Carlson Joshua M. , DiLalla Lisabeth F. , Reinke Karen S.
Published: July 2015

Emotional facial expressions are important social cues that convey salient affective information. Infants, younger children, and adults all appear to orient spatial attention to emotional faces with a particularly strong bias to fearful faces. Yet in young children it is unclear whether or not both happy and fearful faces extract attention. Given that the processing of emotional faces is believed by some to serve an evolutionarily adaptive purpose, attentional biases to both fearful and happy expressions would be expected in younger children. However, the extent to which this ability is present in young children and whether or not this ability is genetically mediated is untested. Therefore, the aims of the current study were to assess the spatial-attentional properties of emotional faces in young children, with a preliminary test of whether this effect was influenced by genetics. Five-year-old twin pairs performed a dot-probe task. The results suggest that children preferentially direct spatial attention to emotional faces, particularly right visual field faces. The results provide support for the notion that the direction of spatial attention to emotional faces serves an evolutionarily adaptive function and may be mediated by genetic mechanisms.