Sex,race, and experiences of aggression

Most previous research on sex differences in experienced aggression has confounded the sex of the aggressor and of the target by considering married or dating couples. In the present study, black and white male and female college students were asked about specific acts of aggression which they had received from or directed toward a male or female. As predicted, males were likely to have both received and exhibited more forms of aggressive behavior, although females were somewhat more likely to have been honked at, to have been forced by a male to have sex, and to have slapped someone. Few racial differences were found, but it appeared that blacks might have been relatively more likely to exhibit physical aggression and whites to exhibit nonphysical aggression. Some differences were found in specific behaviors directed toward and received from males and females, but in general subjects said that they received more aggressive behaviors than they directed toward others. © 1992 Wiley-Liss, Inc.     

Maternal aggression in mice and rats towards male and female conspecifics

Although postpartum aggression is primarily studied in laboratory mice and rats, it is unclear how the two species compare in terms of the factors associated with peak levels of aggressive behavior. Using the same experimental protocol, we assessed the relative effect of intruder sex and time since parturition on the frequency of maternal aggression in Long-Evans rats and CFW mice. Females were studied for 2 consecutive cycles of pregnancy and lactation. During the first lactation, aggression was tested 2 times per week for 3 weeks in order to select animals that attacked at least once. During the second lactation, both pup care and aggressive behavior were assessed in detail. Testing occurred twice in each lactation week, with postpartum days 1–7, 8–14, and 15–21 considered weeks 1, 2, and 3, respectively. Maternal behavior towards 3 pups was observed for 5 minutes, followed by a confrontation with an intruder. Lactating females encountered female intruders once per week, and male intruders in the alternate weekly test. The same behaviors were measured in the 2 species, except for the tail rattle exhibited by mice and the aggressive posture shown by rats. Lactating rats and mice show similar decreases in pup care behavior as lactation progresses in time; yet the factors associated with peak levels of aggression differ between species. In Long-Evans rats, female intruders receive more attacks, threats, and aggressive postures than males. Frequency of attack bite and sideways threat declines in each passing week of lactation. Lactating mice are more aggressive toward male intruders throughout the lactation period. Mice still attack and threaten during the third week of lactation, but less often in comparison to the first week. Therefore, peak levels of aggression vary in mice and rats both as a function of intruder sex and lactation week.     

Ethnicity,gender, and evaluations of aggression

In order to investigate some of the ways in which ethnicity and gender influence interpretations of aggression, 363 Anglo and Hispanic university students responded to a questionnaire soliciting their evaluations of aggression in three situations. Consistent with previous research and with the stereotype of machismo, Hispanics, particularly Hispanic males, were more likely to endorse some aggressive behaviors than Anglos. However, the same pattern of gender influences emerged for both ethnic groups. As predicted, males were more aggressive and more supportive of fighting back and punishing an aggressor than females, whereas females were more likely to show self-control about aggression and to endorse restraint. Respondents, particularly males, said that they would behave more aggressively toward a male, and they encouraged a male to behave more aggressively. These results are consistent with the social constructionist view that performance and evaluations of aggression are largely influenced by cultural factors. © 1995 Wiley-Liss, Inc.     

Sex Differences, Attributional Style, and Depressive Symptoms Among Adolescents

This study examined attributional style, sex, and depressive symptoms and diagnosis in high school students. The results revealed that (1) for females and males, higher levels of depressive symptoms correlated with a more depressive attributional style; (2) females and males who met diagnostic criteria for a current depressive disorder evidenced more depres-sogenic attributions than psychiatric controls, and never and past depressed adolescents; (3) although no sex differences in terms of attributional patterns for positive events, negative events, or for positive and negative events combined emerged, sex differences were revealed on a number of dimensional scores; (4) across the Children's Attributional Style Questionnaire (CASQ) subscale and dimensional scores, the relation between attributions and current self-reported depressive symptoms was stronger for females than males; and (5) no Sex × Diagnostic Group Status interaction effects emerged for CASQ subscale or dimensional scores. Implications of the complex findings from this large-scale, methodologically sophisticated study are addressed.     

Anger and aggression during role-playing: Gender differences between hormonally treated male and female transsexuals and controls

A role-playing study on anger was conducted in order to identify the influence of sex hormones on individual and gender differences in irritation, anger arousal, and aggression. Different groups were studied: female-to-male and male-to-female transsexuals, with either group tested after 3 months of cross-sex hormone treatment, and untreated control women and men. All subjects were exposed to a 35-min videotape of an individual tested in an aversive, physically stressful, and frustrating situation in the laboratory. While watching, subjects were asked to imagine being in the same situation. Meanwhile, cardiovascular responses were registered and the intensity of moods and aggressive behaviour were assessed. Apart from a clear effect upon cardiovascular arousal and anger-related moods, there were also some interesting differences between the four groups, the most interesting one being a stronger aggressive response in the female-to-male transsexuals. Furthermore, interesting information was gathered with respect to the issue of whether role-playing and actual experimentation provide valid tests of anger and aggression in real life. © 1995 Wiley-Liss, Inc.     

Social organization and aggression within small groups of female siamese fighting fish,betta splendens

Small groups of female Siamese fighting fish were observed in an attempt to determine whether a dominance order exists in these fish. Each fish, in each group, was allocated a rank for each activity on each day of observation. The rankings for the number of bites of food from a restricted source, the number of displays, the order of attacks, and the number of attacks each showed a significant concordance from day to day. A significant concordance was also found between the rankings of the different parameters. These data show that a stable dominance order is formed when females are in small groups. The top-ranked fish engages in more mutual displays and single-fish displays with the second-ranked fish than with the bottom-ranked fish. Displays showed differences in duration dependent upon whether or not they resulted in an attack. These data are discussed in terms of the conflict hypothesis and are in agreement with Simpson [1968] concerning the use of that hypothesis.     

The Relationship between Social Dominance Orientation and Gender: The Mediating Role of Social Values

Invariance hypothesis posits that, across cultures and contexts, men are higher in SDO than women. Social Dominance Theory (SDT) suggests that this difference is biologically determined and resulting from the differences in reproductive strategies between sexes. In this study we tested the hypothesis that values can explain gender–SDO differences. SDT suggests that SDO mediates gender differences in values. The contrasting hypothesis suggests that gender–SDO differences are mediated by values. Using SEM with a sample of Italian University students (N = 162, 80 men), the results provided strong support for the hypothesis of a mediation effect of values. Indeed, when controlling for values, gender difference in SDO disappear. Very similar findings were obtained for both GBD and OEQ. Results are discussed.     

Social Dominance Orientation, Authoritarianism, and Support for Intergroup Violence Between the Middle East and America

Social dominance theory has generally posited that terror and intergroup violence can be explained in terms of social dominance struggles. Social dominance theorists have described terror mostly as a tool for maintaining intergroup hierarchies in society (Sidanius & Pratto, 1999). Although implications of the theory suggest that terror may also be used by lower status groups as a tool for the resistance of domination by higher status groups, this prediction heretofore has not been empirically demonstrated. Data from two samples, one in the United States and one in Lebanon, were collected regarding attitudes toward terrorism and intergroup violence. The results show that the American sample demonstrates the typical patterns of social dominance such that those who are higher in social dominance orientation tend to support greater violence toward the Middle East. However, the Lebanese sample shows the opposite pattern, such that those who are lower in social dominance orientation tend to support violence toward the West. These results suggest that (1) support for terrorism among Middle East citizens is a project of counterdominance, and, more broadly, that (2) the relationship between social dominance orientation and support for violence depends on the dynamics of the conflict and the status of the perpetrators.     

Cooperative social coordination and aggression: Sex and strain differences in the effects of housing on gonadectomized rats with hormone replacement

Laboratory rats were used to investigate sex and strain differences in the effects of aggression on a cooperative behavior in which pairs learn to coordinate shuttling in a rectangular chamber. The level of aggression was manipulated by comparing males and females of the aggressive S3 strain and a less aggressive Sprague-Dawley-derived strain and by housing same-sex partners either together or individually (eight groups, n = 7 pairs per group). Hormone levels were stabilized by gonadectomy and daily injections of the appropriate sex hormone. The only serious coordination deficits were in individually housed males, associated with violent fighting and an extreme dominance/subordinance relationship that was not observed in females. All other groups readily learned and performed the coordination, with evidence that low and moderate levels of aggression could facilitate coordination by evoking species-typical behaviors that increased proximity, synchrony, and differentiation within pairs. The discussion focused on models of affiliative behavior in the study of aggression and the compatibility between moderate levels of aggression and cooperation.     

Intersexual aggression and male sexual activity in captive rhesus macaques

Rape has been posited to be an outgrowth of male reproductive strategies. Forced copulations may have evolved as a consequence of the low parental investment made by males in producing and raising offspring. We designed a laboratory experiment which paired rhesus macaque males with females in order to assess the influence of intersexual aggression on male sexual activity. Younger and older adult males had comparable levels of sexual behavior, but younger males were more aggressive towards females than were older males. In addition, females threatened younger males more than older males. Male attacks on females did not result in sexual intercourse. On the contrary, a negative correlation existed between male aggression towards females and male success at achieving intromissions. Female aggression towards males appeared to be an effective tactic which reduced the chances of sexual intercourse. We conclude that intersexual aggression acts either as a mechanism of dominance assertion or as a means to increase spatial distance between individuals. These data do not support the idea that rape in humans has an evolutionary foundation derived from male reproductive strategies.     

Applicability of olweu' aggression inventory in a sample of chinese primary school children

A sample of Chinese children in Grade 4 (155 boys and 135 girls with an average age of 10.3 years) completed Olweu' Aggression Inventory, an instrument developed for the assessment of aggressive and aggression controlling behavior tendencies in a Western culture. Results indicated that the questionnaire gave quite meaningful information when used with the Chinese children. Two interpretable factors, general aggression and aggression control, were derived; the pattern of factor loadings was essentially the same for boys and girls. The internal consistency reliabilities of the two factor scales were in the 0.80s and 0.70s, respectively. Overall, the findings indicated that there were distinct measurable individual differences among Chinese children in the domain of aggression—in spite of strong societal pressures against aggressive behavior and towards aggression control. However, some results suggested that aggression was a somewhat more global, or less differentiated, phenomenon for the Chinese as compared with the Swedish children. The two main factor scales were related meaningfully to other self report dimensions such as positive attitude to school and negative relations with parents. In all probability, the pattern of findings gave a valid picture of the behavior and attitudes of the Chinese children: By and large they were nonaggressive, well-behaved, ambitious, friendly, prosocial, and exerted strong control over aggressive feelings and behavior tendencies. In possible conflicts with adults, they were likely to take a humble and submissive attitude. These findings agree well with the impressions of Western observers and with what can be expected on the basis of the typical socialization patterns found in the People's Republic of China. Furthermore, quite marked sex differences in aggression were obtained and a partial correlation analysis showed that the higher aggression level of the boys could only to a very limited degree be explained by their lower level of aggression control or inhibitions. Generally, the sex differences in aggression were interpreted to reflect genetic variations in basic predispositions in boys and girls that had been subtly enlarged by more or less clear, sex-linked differences in environmental conditions.     

Dominance,physiology, and self-aggression in monkeys

Several tests failed to detect any relationship between the amount of self-aggression (SA) and either spontaneous or contrived dominance rank of self-aggressive stumptailed macaques living in groups. SA and stereotyped movements were affected differently when the subjects were given drugs, suggesting a dissociation between these two behaviors. SA did not correlate with measured adrenocortical arousal, indicating that self-aggressive monkeys are not stressed as they are when receiving social aggression. Theories of social aggression, such as social learning theory, deal poorly with self-directed aggression.     

Exposure to violent video games and aggression in German adolescents: a longitudinal analysis

The relationship between exposure to violent electronic games and aggressive cognitions and behavior was examined in a longitudinal study. A total of 295 German adolescents completed the measures of violent video game usage, endorsement of aggressive norms, hostile attribution bias, and physical as well as indirect/relational aggression cross‐sectionally, and a subsample of N=143 was measured again 30 months later. Cross‐sectional results at T1 showed a direct relationship between violent game usage and aggressive norms, and an indirect link to hostile attribution bias through aggressive norms. In combination, exposure to game violence, normative beliefs, and hostile attribution bias predicted physical and indirect/relational aggression. Longitudinal analyses using path analysis showed that violence exposure at T1 predicted physical (but not indirect/relational) aggression 30 months later, whereas aggression at T1 was unrelated to later video game use. Exposure to violent games at T1 influenced physical (but not indirect/relational) aggression at T2 via an increase of aggressive norms and hostile attribution bias. The findings are discussed in relation to social‐cognitive explanations of long‐term effects of media violence on aggression. Aggr. Behav. 35:75–89, 2009. © 2008 Wiley‐Liss, Inc.     

The effects of food deprivation,aggression, and isolation on infanticide in the male Mongolian gerbil

Male Mongolian gerbils show an increase in infanticide and pup-cannibalism after 24-hr food deprivation, suggesting that food acquisition is a function of this activity. Dominant animals show high levels of infanticide, but subordinate animals are inhibited from this activity. An increase in infanticide is seen when males from a single sex group are isolated; this increase resembles that observed when a male is separated from his pregnant mate [Elwood, 1980]. These results suggest a mechanism whereby males are normally brought into a noninfanticidal state during cohabitation with their pregnant mates owing to subordination by the latter. In this manner males are able to utilize strange pups as food but avoid harming their own offspring.     

Authoritarianism,Social Dominance,and Other Roots of Generalized Prejudice

The search for the personological roots of generalized prejudice (or ethnocentrism) began with the authoritarian personality, but in recent years, the twin constructs of right‐wing authoritarianism and social dominance orientation have been widely treated as the dual processes that lead to generalized prejudice. However, studies conducted for this article show that other constructs, notably empathy and principled moral reasoning, contribute important additional variance. Whereas authoritarianism and social dominance positively predict generalized prejudice, empathy and principled moral reasoning are related negatively to it. For the final study, a structural model of these relationships was tested. To fully understand individual differences in the propensity for generalized prejudice, it is necessary to move beyond the dual processes union of authoritarianism and social dominance.     

How Social Dominance Orientation Affects Union Participation: The Role of Union Identification and Perceived Union Instrumentality

Bridging social dominance theory and labour studies, this field study investigated the mechanisms underpinning the relationship between rejection of group‐based domination and participation in union activities. Respondents (N = 135) were members of a public sector union in California, that is, a hierarchy‐attenuating institution. Results revealed that union identification mediated the negative relationship between social dominance orientation and active union participation. Moreover, the mediational effect of union identification was moderated by perceived union instrumentality (i.e. outcome‐ and process‐based benefits afforded by the union), indicating that the relationship between union identification and participation was stronger among those union members who consider that the union affects workplace justice. The findings reveal the importance of both identity‐based and instrumental motivations underlying union participation. The novelty of applying social dominance theory to union behaviour is underscored. Copyright © 2012 John Wiley & Sons, Ltd.     

Infanticide and maternal aggression: Synchrony of male and female reproductive strategies in mice

Thirty-six percent of male mice from three strains attacked newborn pups sired by another male. No male attacked its own offspring. Females did not show differential aggression toward males likely (strangers) or unlikely (sires) to attack their pups. Both forms of aggression were unaffected by housing in rooms which did or did not contain the aggression targets. The three strains differed in strength of maternal aggression but not in the incidence of infanticide. Females showed more aggression when mated with males of the same, rather than a different, strain but no differences with intruders of the same or a different strain. Infanticide by males is best viewed as a postcopulatory, intermale-competition strategy, and maternal aggression as a counter strategy.