The organization of play fighting in the grasshopper mouse (Onychomys leucogaster): Mixing predatory and sociosexual targets and tactics

The body targets contacted, the type of contact made, and the patterns of defense and counterattack elicited by those attacks are examined in the play fighting of captive male and female pairs of grasshopper mice. The nape was the most frequently contacted body target, irrespective of the type of contact made, be it nosing, allogrooming, biting, or striking with a forepaw. The types of defense varied with both body area contacted and type of attack performed. Based on the topography and pattern of contact, it was concluded that grasshopper mice, as is the case for many other muroid rodents, primarily attack and defend targets otherwise contacted during precopulatory encounters. However, grasshopper mice, which are obligate carnivores, also attack and defend predatory targets, although less frequently than sociosexual targets. Surprisingly, predatory attacks were more likely to be counterattacked with predatory attacks, whereas sociosexual attacks were more likely to be counterattacked with sociosexual attacks. Conspecific aggression involves bites directed at the face, lower flanks, and dorsum. Neither the biting of these areas nor the tactics of attack and defense usually associated with such bites were observed during the juvenile interactions. There were no sex differences in either frequency or patterns of attack and defense in play fighting. The data presented for grasshopper mice shed light on the issue of mixing behavior patterns from multiple functional systems during play. Aggr. Behav. 26:319–334, 2000. © 2000 Wiley‐Liss, Inc.     

A comparison of 8- and 11-year-old girls' and boys' participation in specific types of rough-and-tumble play and aggressive fighting: Implications for functional hypotheses

Study 1 compared the extent to which 8- and 11-year-old girls and boys (N = 86) participated in specific types of rough-and-tumble play. It used an observational methodology. The data were used to test two prominent hypotheses about the evolutionary function of this general category of play behaviour that have been applied to children, especially boys, of this age. One is that rough-and-tumble play provides practice for the development of real fighting skills and the other that it serves as a safe way to establish/display social dominance. Both hypotheses predict that boys will engage in more rough-and-tumble play than girls, especially those types that are used in fighting/dominance contests. Boys were found to engage in significantly more chase initiation activities, more bouts of brief rough-and-tumble play, more bouts of restraining and more bouts of boxing/hitting than girls. These data provide some support for the two hypotheses, although significant sex differences were not found for all types of rough-and-tumble play observed. No significant age differences were obtained, suggesting that the two hypotheses may be applicable throughout the 8- to 11-year-old period and not just at the end of it as previous research had suggested. Study 2 presented observational data concerning the motor patterns used in aggressive fighting. In all but one case, there were no significant differences in the extent to which 8/9- and 10/11-year-old girls and boys employed wrestling, hitting and restraining, supporting the view that the practice fighting hypothesis is relevant throughout the 8-11-year-old period. It was argued that age and sex differences provide a useful means of scrutinising functional hypotheses, and that splitting behavioural categories that contain disparate action patterns facilitates more refined tests of those hypotheses. © 1996 Wiley-Liss, Inc.     

Preferences for ‘Gender‐typed’ Toys in Boys and Girls Aged 9 to 32 Months

Many studies have found that a majority of boys and girls prefer to play with toys that are typed to their own gender but there is still uncertainty about the age at which such sex differences first appear, and under what conditions. Applying a standardized research protocol and using a selection of gender‐typed toys, we observed the toy preferences of boys and girls engaged in independent play in UK nurseries, without the presence of a parent. The 101 boys and girls fell into three age groups: 9 to 17 months, when infants can first demonstrate toy preferences in independent play (N = 40); 18 to 23 months, when critical advances in gender knowledge occur (N = 29); and 24 to 32 months, when knowledge becomes further established (N = 32). Stereotypical toy preferences were found for boys and girls in each of the age groups, demonstrating that sex differences in toy preference appear early in development. Both boys and girls showed a trend for an increasing preference with age for toys stereotyped for boys. Theoretical implications of the findings are discussed with regard to biological predispositions, cognitive development and environmental influences on toy preference. Copyright © 2016 John Wiley & Sons, Ltd.     

Rough‐and‐tumble play and the regulation of aggression: an observational study of father–child play dyads

Rough‐and‐tumble play (RTP) is a common form of play between fathers and children. It has been suggested that RTP can contribute to the development of selfregulation. This study addressed the hypothesis that the frequency of father–child RTP is related to the frequency of physically aggressive behavior in early childhood. This relationship was expected to be moderated by the dominance relationship between father and son during play. Eighty‐five children between the ages of 2 and 6 years were videotaped during a free‐play session with their fathers in their homes and questionnaire data was collected about father–child RTP frequency during the past year. The play dyads were rated for the degree to which the father dominated play interactions. A significant statistical interaction revealed that RTP frequency was associated with higher levels of physical aggression in children whose fathers were less dominant. These results indicate that RTP is indeed related to physical aggression, though this relationship is moderated by the degree to which the father is a dominant playmate. Aggr. Behav. 35:285–295, 2009. © 2009 Wiley‐Liss, Inc.     

Social judgment of aggressive language: Effects of target and sender sex on the evaluation of slurs

We investigated the influence of the sex of the target and the sex of the sender on the judgment of slurs (verbal derogation). From previous research, we selected and clustered slurs into seven categories and respondents rated their degree of perceived insult in two consecutive questionnaire surveys (N = 281 and N = 224, respectively). Results confirm that slurs are generally judged as being more insulting when directed towards females than towards males. In comparison, differences in sex of sender were small. When directed towards females, slurs referring to “being loose” were rated as the most insulting. For both target sexes, remarks referring to homosexuality and physical unattractiveness were among those rated as the most insulting. Least insulting were slurs referring to unethical acts, lack of intelligence and cowardliness. A sex of respondent effect was found, suggesting that women rated slurs generally more insulting than men. The pattern of results showed considerable stability across surveys attesting for the reliability of the method for measuring the social evaluation of slurs.     

Israeli kindergarten children's gender constancy for others' counter‐stereotypic toy play and appearance: the role of sibling gender and relative age

To test divergent theoretical predictions as to the impact of having a younger or older, same‐sex sibling or opposite‐sex sibling on other gender constancy, Israeli kindergarten children in two‐child families responded to a gender constancy task in which a male and female picture target engaged in counter‐stereotypic toy play and adopted counter‐stereotypic appearance. Children were also asked whether the target child could change sex at will and to explain the difference between boys and girls. Relative age of sibling, both independently and in interaction with participant sex, was associated with greater gender constancy in the face of counter‐stereotypic toy play. Relative age of sibling and sibling sex was independently associated with greater gender constancy in the face of counter‐stereotypic appearance. In both cases, children with a younger sibling evidenced greater gender constancy. Boys, especially ones with a male sibling, referred most explicitly to target's birth sex in accounting for his or her being unable to change sex at will. Genital and anatomical differences between boys and girls were cited more often by children who referred explicitly to target's birth sex and had a younger sibling. The results were discussed in the context of theories of gender development and the socialization of gender within the family. Copyright © 2008 John Wiley & Sons, Ltd.     

Revisiting the Effects of Anger on Risk‐Taking: Empirical and Meta‐Analytic Evidence for Differences Between Males and Females

That anger elicited in one situation can carry over to drive risky behavior in another situation has been described since the days of Aristotle. The present studies examine the mechanisms through which and the conditions under which such behavior occurs. Across three experiments, as well as a meta‐analytic synthesis of the data, results reveal that incidental anger is significantly more likely to drive risky decision making among males than among females. Moreover, the experiments document that, under certain circumstances, such risk‐taking pays off financially. Indeed, the present experiments demonstrate that, because the expected‐value‐maximizing strategy in these studies rewarded risk‐taking, angry‐male individuals earned more money than did both neutral‐emotion males and angry females. In sum, these studies found evidence for robust disparities between males and females for anger‐driven risk‐taking. Importantly, although men did not experience more anger than women, they did show a heightened tendency to respond to anger with risk‐taking. Published 2016. This article has been contributed to by US Government employees and their work is in the public domain in the USA.     

面孔吸引力、人格标签对于男女择偶偏好的影响

通过对征婚启事、婚姻统计资料等的分析发现相貌、身材对于男性择偶重要, 能力、资源和个性等对于女性择偶重要。本研究运用实验法进一步探讨了面孔吸引力、人格标签及其交互对于大学生理想择偶偏好的影响。研究结果表明：(1)对于漂亮异性, 男性与其成为情侣的意愿显著高于女性; 而对于不漂亮的异性, 男性与其成为情侣的意愿明显低于女性。(2)对于积极词汇标签下的异性, 女性与其成为情侣的意愿显著高于男性; 而对于消极词汇标签下的异性, 女性与其成为情侣的意愿显著低于男性。(3)与消极词汇标签比较, 积极词汇标签使被试更愿意与其成为情侣, 但这种意愿的提高在相对漂亮的面孔上表现得更加明显。(4)大五人格的五个维度对择偶意愿都有影响, 影响力依次为尽责性、随和性、开放性、情绪稳定性和外倾性。女性更喜欢外向的男性, 但女性是否外向对男性择偶无影响。研究结果为理解择偶行为的性别差异提供了实验性证据。     

Teacher–child conflict and aggressive behaviour in first grade: the intervening role of children's self‐esteem

High levels of teacher–child conflict have repeatedly been found to amplify children's aggressive behaviour. Up to now, however, research on possible mechanisms explaining this link is largely lacking. The current study aimed to test whether children's self‐esteem is an intervening mechanism. Participants were 139 children (70 boys, M age = 6.18 years) and their teachers from 35 classes in 19 schools who were followed longitudinally throughout first grade. Teacher–child conflict was measured during the first trimester (October to December), children's self‐esteem (three child interviews) during the second trimester (January to March) and children's aggressive behaviour during the first and third trimester (April to June). Teacher–child conflict had a significant indirect effect on changes in children's aggressive behaviour across first grade through its effect on children's self‐esteem. Copyright © 2011 John Wiley & Sons, Ltd.     

Real‐World Correlates of Performance on Heuristics and Biases Tasks in a Community Sample

In the current study, we sought to examine whether performance on several heuristics and biases tasks and thinking dispositions was associated with real‐life correlates in a community sample of adults. We examined performance on five heuristics and biases tasks (ratio bias, belief bias in syllogistic reasoning, cognitive reflection, probabilistic and statistical reasoning, and rational temporal discounting), three thinking dispositions (actively open‐minded thinking, future orientation, and avoidance of superstitious thinking), and a questionnaire assessing real‐world correlates in several domains (substance use, driving behavior, financial behavior, gambling behavior, electronic media use, and secure computing). Our heuristics and biases tasks and thinking disposition measures were modestly associated with several real‐world outcomes, including the domains of secure computing, financial behaviors, and the total scores. That is, better performance on the heuristics and biases measures was associated with fewer negative outcomes. We found that the associations were generally higher in males than in females. Heuristics and biases performance and thinking dispositions were unique predictors of real‐world outcomes after statistically controlling for educational attainment and sex differences. Copyright © 2016 John Wiley & Sons, Ltd.     

NEO-FFI scores in college men and women: A view from McDonald’s unified treatment of test theory

There is a need for more detailed psychometric data in describing and evaluating the NEO-FFI (Costa & McCrae, 1992), especially in samples of men and women enrolled in Introductory Psychology classes. This article meets that need and in so doing introduces to a new and wide audience procedures recently advocated by McDonald (1999) in his unified treatment of test theory. Results reveal a wide range of strengths and weaknesses in the NEO-FFI at both the item and sum-score levels, as well as sources of concordance and discordance between men and women at both levels.     

Effects of trait anger and anger expression style on competitive attack responses in a wartime prisoner’s dilemma game

We assessed the role of trait anger and anger expression style on competitive/aggressive decision making and responding. In a 100‐trial iterated Prisoner’s Dilemma (IPD), with instructions to simulate wartime interactions, competition/aggression was defined as “attacking the opponent,” and “waiting for troop reinforcements” was the noncompetitive alternative response. Prior to play, 92 university student players completed the State‐Trait Anger Expression Inventory. They were then paired to play the IPD against partners of similar or dissimilar trait anger levels. At postplay, the State Anger scale was readministered. Results showed significant preplay to postplay increases in state anger, with greater increases shown by high trait anger players. Thus, high trait anger players were especially subject to arousal. Players in the high trait anger group made more competitive/attack responses, and they were more likely to do so when paired with a high trait anger partner. As a result of the high level of competitive/aggressive play, both groups ended with a negative troop count. Trait anger as a general personality temperament was predictive of state anger, competitive/attack responses, and the number of trials before a retaliation was made. The expressive style of anger‐control was also related to manner of play. Trait anger had strong direct and indirect effects through anger control on the number of competitive attack responses. It was concluded that trait anger, especially trait anger/temperament, and anger control difficulties may be toxic personality factors in decision making and competitive behavior. Aggr. Behav. 28:117–125, 2002. © 2002 Wiley‐Liss, Inc.     

Learning through observing: Effects of modeling truth‐ and lie‐telling on children’s honesty

The current study examined the influence of observing another's lie‐ or truth‐telling – and its consequences – on children's own honesty about a transgression. Children (N = 224, 5–8 years of age) observed an experimenter (E) tell the truth or lie about a minor transgression in one of five conditions: (a) Truth‐Positive Outcome – E told the truth with a positive outcome; (b) Truth‐Negative Outcome – E told the truth with a negative outcome; (c) Lie‐Positive Outcome – E lied with a positive outcome; (d) Lie‐Negative Outcome – E lied with a negative outcome; (e) Control – E did not tell a lie or tell the truth. Later, to examine children's truth‐ or lie‐telling behavior, children participated in a temptation resistance paradigm where they were told not to peek at a trivia question answer. They either peeked or not, and subsequently lied or told the truth about that behavior. Additionally, children were asked to give moral evaluations of different truth‐ and lie‐telling vignettes. Overall, 85% of children lied. Children were less likely to lie about their own transgression in the TRP when they had previously witnessed the experimenter tell the truth with a positive outcome or tell a lie with a negative outcome.     

The role of epistemic and social characteristics in children’s selective trust: Three meta‐analyses

Over the last 15 years, researchers have been increasingly interested in understanding the nature and development of children’s selective trust. Three meta‐analyses were conducted on a total of 51 unique studies (88 experiments) to provide a quantitative overview of 3‐ to 6‐year‐old children’s selective trust in an informant based on the informant’s epistemic or social characteristics, and to examine the relation between age and children’s selective trust decisions. The first and second meta‐analyses found that children displayed medium‐to‐large pooled effects in favor of trusting the informant who was knowledgeable or the informant with positive social characteristics. Moderator analyses revealed that 4‐year‐olds were more likely to endorse knowledgeable informants than 3‐year‐olds. The third meta‐analysis examined cases where two informants simultaneously differed in their epistemic and social characteristics. The results revealed that 3‐year‐old children did not selectively endorse informants who were more knowledgeable but had negative social characteristics over informants who were less knowledgeable but had positive social characteristics. However, 4‐ to 6‐year‐olds consistently prioritized epistemic cues over social characteristics when deciding who to trust. Together, these meta‐analyses suggest that epistemic and social characteristics are both valuable to children when they evaluate the reliability of informants. Moreover, with age, children place greater value on epistemic characteristics when deciding whether to endorse an informant’s testimony. Implications for the development of epistemic trust and the design of studies of children’s selective trust are discussed.     

Psychoanalytic considerations about the anti‐oedipal condition in Heinrich von Kleist’s Penthesilea and in the analysis of Miss M1

Based on Heinrich von Kleist’s drama Penthesilea and a clinical case, this study seeks to demonstrate a theoretical concept that is developed and identified as the anti‐oedipal condition. This state involves a regressive insistence on suffocating any form of oedipal maturation and, with it, any form of genital–sexual desire; it damages, even destroys, any form of intellectual–creative curiosity. A specific form of defensive organization, the anti‐oedipal condition, is sought out when psychic development, when oedipal–genital maturation requires re‐establishing contact with a sort of inner terra cremata, an emotional domain that once had been supposed to be eliminated due to catastrophic experiences that could not be integrated. This defensive organization dominated Kleist’s Amazons as well as Miss M. What happened first in both instances was a regression to and fixation at the anti‐oedipal condition, but the paths leading out of this incapsulation were antipodal.     

Longitudinal causal impacts of preschool teacher training on Ghanaian children’s school readiness: Evidence for persistence and fade‐out

Preschool programs have expanded rapidly in low‐ and middle‐income countries, but there are widespread concerns about whether they are of sufficient quality to promote children's learning and development. We conducted a large school‐randomized control trial (‘Quality Preschool for Ghana’ – QP4G) of a one‐year teacher training and coaching program, with and without parental‐awareness meetings, designed to improve preschool quality and child development. We followed 3,435 children in 240 schools in the Greater Accra Region of Ghana, a country with universal pre‐primary education. A previous study reported positive impacts of teacher training (but not teacher training plus parental‐awareness meetings) at the end of the implementation year on some dimensions of classroom quality, teacher well‐being, and children's school readiness (Wolf et al., [2019] Journal of Research on Educational Effectiveness, 12, 10–37). The present study analyzed a new round of data collected 1 year after the end of implementation to assess (a) the extent of persistence in impacts on child development and (b) whether such impacts vary by select child, household, and school characteristics. We found impacts of the teacher training intervention on children's overall school readiness were sustained (d = 0.13), but were only marginally statistically significant. When broken down by domain, impacts on social–emotional skills specifically persisted. Persistent negative effects of teacher training plus parental‐awareness meetings varied by the literacy status of the male parent such that negative impacts were concentrated in children in households with non‐literate male heads.     

Lack of correlation between digit ratio (2D:4D) and Baron-Cohen’s “Reading the Mind in the Eyes” test, empathy, systemising, and autism-spectrum quotients in a general population sample

The second-to-fourth digit ratio (2D:4D) is sexually differentiated and is a likely biomarker for the organisational (permanent) effects of prenatal testosterone on the human brain. Recent research has highlighted a possible role of prenatal testosterone levels in both the etiology of autism-spectrum disorders and in sex and individual differences in cognitive styles of the normal mind (Baron-Cohen’s Extreme Male Brain Theory of Autism and Empathising/Systemising Theory). Importantly, autistic children present lower (hypermasculinised) 2D:4D than healthy controls. Based on these accounts, we investigated the relation of 2D:4D with Baron-Cohen’s measures of empathising (“Reading the Mind in the Eyes” test, RMET; Empathy Quotient, EQ), systemising (Systemising Quotient, SQ), and autistic-like traits (Autism-Spectrum Quotient, AQ) in the general population (N = 423 Austrian adults). Whereas sex differences into the expected direction and of expected size were obtained for all variables and internal scale consistencies tallied to retrievable reference values, 2D:4D was unrelated to RMET, EQ, SQ, and AQ scores. Candidate explanations for this lack of correlation might be possible developmental timing differences in the expression of 2D:4D and empathising/systemising, qualitative (as opposed to quantitative) functional differences between the normal and the autistic mind, or the suboptimal psychometric properties of the measures.