Sexual violence during war varies in extent and takes distinct forms. In some conflicts, sexual violence is widespread, yet in other conflicts—including some cases of ethnic conflict—it is quite limited. In some conflicts, sexual violence takes the form of sexual slavery; in others, torture in detention. I document this variation, particularly its absence in some conflicts and on the part of some groups. In the conclusion, I explore the relationship between strategic choices on the part of armed group leadership, the (...) norms of combatants, dynamics within small units, and the effectiveness of military discipline. (shrink)

The ten original studies included in this Research Topic investigate selected assumptions and predictions of parochial altruism theory in detail. We, the editors, are convinced that their highly instructive findings will help researchers interested in parochial altruism, but also in intergroup psychology more generally, to gain a much more fine-grained understanding of the interplay of altruistic and spiteful motives in human decision making in the context of intergroup relations. The broad range of disciplines represented by the authors contributing to this (...) Research Topic and the variety of methods used in their studies are representative for the current interdisciplinary interest in parochial altruism. The most important insight that, in our view, can be derived from the works collected here is that human decision making in intergroup contexts is more complex than suggested by current theory. Thus, we hope that future theorizing on parochial altruism will be stimulated by the evidence gathered in this Research Topic. In this editorial, we briefly highlight central findings reported here, which, to us, appear most informative for prospective enhancements of parochial altruism theory. (shrink)

In this paper, I critique arguments made by philosopher David Buller against central evolutionary-psychological explanations of human mating. Specifically, I aim to rebut his criticisms of Evolutionary Psychology regarding (1) women's long-term mating preferences for high-status men; (2) the evolutionary rationale behind men's provisioning of women; (3) men's mating preferences for young women; (4) women's adaptation for extra-pair sex; (5) the sex-differentiated evolutionary theory of human jealousy; and (6) the notion of mate value. In sum, I aim to demonstrate that (...) Buller's arguments contra Evolutionary Psychologists are left wanting. (shrink)

The disagreement between philosophers about the scientific worth of the evolutionary behavioral sciences (evolutionary psychology, human behavioral ecology, etc.) is in part due to the fact that critics and advocates of these sciences characterize them very differently. In this article, by analyzing quantitatively the citations made in the articles published in Evolution & Human Behavior between January 2000 and December 2002, we provide some evidence that undermines the characterization of the evolutionary behavioral sciences put forward by their critics.

Why are people interested in money? Specifically, what could be the biological basis for the extraordinary incentive and reinforcing power of money, which seems to be unique to the human species? We identify two ways in which a commodity which is of no biological significance in itself can become a strong motivator. The first is if it is used as a tool, and by a metaphorical extension this is often applied to money: it is used instrumentally, in order to obtain (...) biologically relevant incentives. Second, substances can be strong motivators because they imitate the action of natural incentives but do not produce the fitness gains for which those incentives are instinctively sought. The classic examples of this process are psychoactive drugs, but we argue that the drug concept can also be extended metaphorically to provide an account of money motivation. From a review of theoretical and empirical literature about money, we conclude that (i) there are a number of phenomena that cannot be accounted for by a pure Tool Theory of money motivation; (ii) supplementing Tool Theory with a Drug Theory enables the anomalous phenomena to be explained; and (iii) the human instincts that, according to a Drug Theory, money parasitizes include trading (derived from reciprocal altruism) and object play. (Published Online April 5 2006) Key Words: economic behaviour; evolutionary psychology; giving; incentive; money; motivation; play; reciprocal altruism. (shrink)

During human evolutionary history, there were “trade-offs” between expending time and energy on child-rearing and mating, so both men and women evolved conditional mating strategies guided by cues signaling the circumstances. Many short-term matings might be successful for some men; others might try to find and keep a single mate, investing their effort in rearing her offspring. Recent evidence suggests that men with features signaling genetic benefits to offspring should be preferred by women as short-term mates, but there are trade-offs (...) between a mate's genetic fitness and his willingness to help in child-rearing. It is these circumstances and the cues that signal them that underlie the variation in short- and long-term mating strategies between and within the sexes. Key Words: conditional strategies; evolutionary psychology; fluctuating asymmetry; mating; reproductive strategies; sexual selection. (shrink)

Since the dawn of the internet, pornography has effectively become ubiquitous, pervasive, and increasingly normalised. Study findings show remarkable similarities in how the brain reacts to pornography, and other known addictive substances, and indicate that consuming pornography is comparable to consuming other known addictive substances. Moreover, two of the biggest risk factors for addiction are the substance’s availability and its easy accessibility, particularly in the case of younger persons. To date, pornography addiction has been conceptualised as a behavioural addiction. However, (...) the body of research data on pornography addiction does not provide conclusive support for behavioural addiction. The aim of this thesis is to put forward the idea that pornography can, and should, be conceptualised as an addictive substance, and, that when pornography is consumed, an addictive substance is consumed. In order to support this claim, there are many factors that must be addressed. I first clarify what pornography entails by exploring how it is conceptualised, what pornography ‘does’, and what it means to be a pornography consumer. Secondly, I examine the conceptualisations of substances, substance consumption and addiction, respectively, as well as the subsequent difference between substance and behavioural addiction. Thirdly, I give an inclusive overview of pornography addiction by not only examining the most recent perspectives of researchers, but also of pornography consumers. I conclude by suggesting how we should go about conceptualising pornography addiction, and then propose how the set of diagnostic criteria for pornography use disorder should be formulated for a future iteration of the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorders. I argue that, given the abundance of academic research on substance addiction, compared to the scarcity of research on behavioural addiction, conceptualising pornography as an addictive substance is more likely to create a sense of urgency for the future research of pornography addiction than would be the case if it is considered a potential behavioural addiction. Furthermore, I argue that the classification of pornography as an addictive substance, and the inclusion of pornography use disorder in a future iteration of the DSM, will raise awareness of the potential adverse effects of pornography consumption and, therefore, the harmful consequences of pornography use disorder. (shrink)

Male-male competition is involved in inter- and intrasexual selection, with both endocrine and psychological factors presumably contributing to reproductive success in human males. We examined relationships among men’s naturally occurring testosterone, their self-perceived mate value, self-esteem, sociosexuality, and expected likelihood of approaching attractive women versus situations leading to child involvement. We then monitored changes in these measures in male rowers from Cambridge, UK, following a manipulated “win” or “loss” as a result of an indoor rowing contest. Baseline results revealed that (...) men with heightened testosterone and SPMV values typically had greater inclinations toward engaging in casual sexual relationships and a higher likelihood of approaching attractive women in a hypothetical social situation. As anticipated, both testosterone and SPMV increased following a manipulated “victory” and were associated with heightened sociosexuality, and increased expectations toward approaching attractive women versus individuals who would involve them in interacting with children after the race. SPMV and self-esteem appeared to mediate some of the effects of testosterone on post-race values. These findings are considered in the broader context of individual trade-offs between mating and parental effort and a model of the concurrent and dynamic androgenic and psychological influences contributing to male reproductive effort and success. (shrink)

Extraversion has two central characteristics: (1) interpersonalengagement, which consists of affiliation (enjoying and valuing close interpersonal bonds, being warm and affectionate) and agency (being socially dominant, enjoying leadership roles, being assertive, being exhibitionistic, and having a sense of potency in accomplishing goals) and (2) impulsivity, which emerges from the interaction of extraversion and a second, independent trait (constraint). Agency is a more general motivational disposition that includes dominance, ambition, mastery, efficacy, and achievement. Positive affect (a combination of positive feelings and (...) motivation) is closely associated with extraversion. Extraversion is accordingly based on positiveincentivemotivation. (shrink)

In this paper we provide a critical review of research concerned with social/environmental mechanisms that modulate human neuroendocrine function. We survey research in four behavioral systems that have been shaped through evolution: competition, partnering, sex, and pregnancy/parenting. Generally, behavioral neuroendocrine research examines how hormones affect behavior. Instead, we focus on approaches that emphasize the effects of behavioral states on hormones (i.e., the “reverse relationship”), and their functional significance. We focus on androgens and estrogens because of their relevance to sexually selected (...) traits. We conclude that the body of research employing a reversed or bidirectional perspective has an incomplete foundation: participants are mainly heterosexual men, and the functionality of induced shifts in neuroendocrine factors is generally unknown. This area of research is in its infancy, and opportunities abound for developing and testing intriguing research questions. (shrink)

Collins provides a grand theory that unifies all forms of human violence occurring in face-to-face situations, ranging from spousal abuse to medieval warfare. Laitin appreciates Collins's microscopic analysis of diverse data but points to important shortcomings in the theory, especially Collins's metaphoric explanations that are not testable. Here Collins's theory is merged with an existing biosocial model of dominance, replacing the metaphors with tangible, measurable hormonal mechanisms.

This paper highlights the evolutionary biological epistemology in Freud psychoanalytic theory. The concepts of aggressive and sexual drives are fulcrum of the psychoanalytic epistemological system, concerning the motivational/emotional roots of mental functioning. These biological roots of mental functioning, especially with regard to aggressive drive, have gradually faded away from psychoanalytic epistemology, as we show in the paper. Currently, however, Neurosciences, and in particular Affective Neuroscience (Panksepp 1998), can contribute to increase the knowledge of the biological roots of human mental functioning. (...) The motivational/emotional systems studied by Affective Neuroscience can give a new epistemological foundation to the aggressive drive concept in psychoanalytic theory. Over the course of human evolution motivational/emotional systems have assumed the role of organizers of social relationships and also of mental functioning. In this regard, among the various types of aggression (ANGER in Panksepp taxonomy 1998), that we consider in our paper is inter-male aggression, also named Dominance motivational/emotional system, which regulates social interactions between sexually mature adults. This type of aggression acts in complementary connection with FEAR motivational/emotional system, that regulate Submissive behaviour and Social defeat, the latter one of the more important stressors. The interaction between aggressiion and FEAR motivational/emotional systems gives rise to Agonistic behaviour or Dominance/Submission motivational/emotional system, as we propose in our paper. There is now a large literature that identifies in the dynamic of Agonistic behaviour one of the main factors of mental illness. When social interactions activate the Agonistic behavior, the subject can perceive himself as "destined to victory" or "destined to defeat", activating either behaviours and emotions connected to the Involuntary Defeat Strategy or Involuntary Dominant Strategy, that we can find in many types of mental disorders, e.g. mood disorders or anxiety disorders. (shrink)

Intrigued by the possible paths that the evolution of religious capacity may have taken, the authors identify a series of six major building blocks that form a foundation for religious capacity in genus Homo. Homo neanderthalensis and Homo sapiens idaltu are examined for early signs of religious capacity. Then, after an exploration of human plasticity and why it is so important, the analysis leads to a final building block that characterizes only Homo sapiens sapiens, beginning 200,000–400,000 years ago, when all (...) the other cognitive and neurological underpinnings gradually came together. Because the timing of cognitive evolution has become an issue, the authors identify the time periods for these building blocks based on findings from modern cognitive science, neuroscience, genomic science, the new cognitive archaeology, and traditional stones-and-bones archaeology. The result is a logical, and even a likely story 55–65 million years long, which leads to the evolution of religious capacity in modern human beings. (shrink)

This paper offers the first philosophical analysis of a form of artificial intelligence (AI) which the author calls facial profiling technology (FPT). FPT is a type of facial analysis technology designed to predict criminal behavior based solely on facial structure. Marketed for use by law enforcement, face classifiers generated by the program can supposedly identify murderers, thieves, pedophiles, and terrorists prior to the commission of crimes. At the time of this writing, an FPT company has a contract with the United (...) States federal government. After recounting how FPT resurrects the same moral problems associated with the pseudoscience of physiognomy, the author of this manuscript develops and defends the ‘Liberal Argument Against Facial Discrimination’ (LAAFD), which concludes that government use of FPT poses a significant risk of violating the classical liberal value of equality before the law by committing unjust discrimination against groups of people whose faces happen to match FPT classifiers. A key move in the argument suggests how a future scenario that results in widespread discrimination based solely on facial structure could be as unjustified and harmful, mutatis mutandis, as similar discrimination based solely on racial background. In the final section, the author of this paper develops prima facie policy proposals designed to protect classical liberal values if FPT is to be utilized by governments in liberal democratic societies. (shrink)

Approach–avoidance generally describes appetitive motivation and fear of punishment. In a social context approach motivation is, however, also expressed as social aggression and dominance. We therefore link approach–avoidance to dominance–submissiveness, and provide a neural framework that describes how the steroid hormone testosterone shifts reflexive as well as deliberate behaviors towards dominance and promotion of social status. Testosterone inhibits acute fear at the level of the basolateral amygdala and hypothalamus and promotes reactive dominance through upregulation of vasopressin gene expression in the (...) central-medial amygdala. Finally, the hormone can, depending on social context and prenatal hormone exposure, promote both pro- and antisocial behaviors and decisions through its effects on prefrontal–amygdala interactions. All these effects of testosterone, however, serve to increase and maintain social status. (shrink)

This study examines steroid production in fathers watching their children compete, extending previous research of vicarious success or failure on men’s hormone levels. Salivary testosterone and cortisol levels were measured in 18 fathers watching their children play in a soccer tournament. Participants completed a survey about the game and provided demographic information. Fathers with higher pregame testosterone levels were more likely to report that referees were biased against their children’s teams, and pre- to postgame testosterone elevation was predicted by watching (...) sons compete rather than daughters as well as perceptions of unfair officiating. Pregame cortisol was not associated with pregame testosterone or with perceived officiating bias, but cortisol did fluctuate synergistically with testosterone during spectator competition. Although fathers showed no consistent testosterone change in response to winning or losing, pregame testosterone may mediate steroid hormone reactivity to other aspects of their children’s competition. (shrink)

Research from psychology, neurobiology and behavioral economics indicates that a binary view of motivation, based on approach and avoidance, may be too reductive. Instead, a literature review suggests that at least seven distinct motives are likely to affect human decisions: “consumption/resource seeking,” “care,” “affiliation,” “achievement,” “status-power,” “threat approach” (or anger), and “threat avoidance” (or fear). To explore the conceptual distinctness and relatedness of these motives, we conducted a semantic categorization task. Here, participants were to assign provided words to one of (...) the motives. By applying principal component analysis to the categorization assignments we represent the semantic inter-relations of these motives on a two-dimensional space, a “semantic atlas.” This atlas suggests that, while care and affiliation are conceptually close, affiliation is closer to threat avoidance (or fear); opposite to these motives we find achievement, consumption and power, with the latter lying closer to threat approach (or anger). In a second study, we asked participants to rate how well the motive-specific words obtained in the first study described their currently experienced feelings. We find that semantically close motives are also more likely to be experienced together, that is, we replicate most of the semantic relations in the “subjective atlas.” We discuss our findings in comparison to other multi-dimensional models of motivation, which show clear similarities. In addition to these motivational atlases, we provide a database of motive-specific words, together with the valence and arousal scores. These can be used for future research on the influence of motives on decision making. (shrink)

Previous research in North America has supported the view that male involvement in committed, romantic relationships is associated with lower testosterone (T) levels. Here, we test the prediction that undergraduate men involved in committed, romantic relationships (paired) will have lower T levels than men not involved in such relationships (unpaired). Further, we also test whether these differences are more apparent in samples collected later, rather than earlier, in the day. For this study, 107 undergraduate men filled out a questionnaire and (...) collected one saliva sample (from which a subject’s T level was measured) at various times across the day. As in previous studies, men involved in committed, romantic relationships had lower salivary T levels, though only during later times of the day. Furthermore, additional analysis of the variation among unpaired subjects indicated that men without prior relationship experience had lower T levels than experienced men. Finally, while paired men as a group had lower T levels than unpaired men, those men at the earliest stage (less than six months) of a current relationship had higher T levels than unpaired men as well as men in longer-term relationships. These results suggest that variation in male testosterone levels may reflect differential behavioral allocation to mating effort. (shrink)

Previous research indicates positive effects of a person’s attractiveness on evaluations of opposite-sex persons, but less positive or even negative effects of attractiveness on same-sex evaluations. These biases are consistent with social motives linked to mate search and intrasexual rivalry. In line with the hypothesis that such motives should not become operative until after puberty, 6- to 12-year-old participants (i.e., children) displayed no evidence for biased social evaluations based on other people’s attractiveness. In contrast, 13- to 19-year-old participants (i.e., adolescents) (...) displayed positive and negative attractiveness biases toward opposite- and same-sex targets, respectively. Moreover, these biases increased with the age—and thus the reproductive relevance—of the targets being evaluated. Findings corroborate the relevance of mating-related motives for social judgment and illustrate how such biases can grow during human development. At a broader conceptual level, this research demonstrates the utility of investigating proximate social judgment processes through the lens of adaptationist thinking. (shrink)

A correlational pilot study (N = 143) and an integrative data analysis of two experiments (total N = 377) provide evidence linking anger to the psychology of social hierarchy. The experiments demonstrate that the experience of anger increases the psychological accessibility of implicit cognitions related to social hierarchy: compared to participants in a control condition, participants in an anger-priming condition completed word stems with significantly more hierarchy-related words. We found little support for sex differences in the effect of anger on (...) implicit hierarchy-related cognition; effects were equivalent across male and female participants. Findings fit with functionalist evolutionary views of anger suggesting that anger may motivate the use of dominance to strive for high social rank in group hierarchies. Implications for downstream behaviour, including aggression and negotiation, are discussed. (shrink)

This study explores the interaction effects of game outcomes and status instability and the moderating role of implicit team identification on spectators’ status-seeking behavior. The current study seeks to contribute to the existing consumer behavior and spectatorship literature by examining the counterintuitive outcomes of winner–loser effects through the application of the biosocial theory of status. In an online experiment, NFL fans’ retrospective spectating experiences were captured and manipulated. This experiment used a 2 × 2 × 2 between-subjects design. The findings (...) indicated that decisive victories and close losses positively influenced spectators’ future attendance as well as their intention to purchase luxury suites and merchandise featuring images of the team mascot. Conversely, decisive losses and close victories had a negative influence. Additionally, the more spectators implicitly identified with a particular team, the more they exhibited status-seeking behavior; even close victories positively influenced the outcomes. By applying a nascent theoretical approach in the field of consumer behavior, our results provide fresh insight into explaining spectators’ status-seeking behavior. Also, the findings identify specific conditions in which spectators’ status-seeking behavior is enhanced, thus suggesting ways for managers to strategically allocate their resources. (shrink)