Aggression during sexual encounters between hormone-treated gonadectomized pigs in the presence or absence of boar pheromones

Aggressive and sexual behaviour was studied in 5-min paired encounters between castrated prepubertal boars (N = 14) and normal (N = 2) or bulbectomized (N = 2) oestrogen-treated ovariectomized gilts. The boars were made sexually active by treatment with 17β-oestradiol + 5α-dihydrotestosterone. Half of the boars were sprayed on the snout with a solution containing a mixture of the boar pheromones 3α-androstenol and 5α-androstenone immediately before testing, and the remainder were treated with the vehicle solution. Aggression was almost always initiated by the gilts, and neither bulbectomy nor pheromone treatment of the boars reduced its occurrence. The results suggest that the display of aggression by gilts towards boars of similar body size is unlikely to be suppressed by the steroidal pheromones present in boar saliva.     

Kinship does not affect litter defence in pairs of communally nesting female house mice

Communal litter defence by sister and nonsister female mice can provide a valuable experimental paradigm to test whether females invest preferentially in kin. Since females within sister and nonsister pairs have different coefficients of relatedness with the young, the cumulative litter has more fitness value for related than for unrelated partners. Sister and nonsister paired females that gave birth simultaneously (n = 18), or at least within 7 days from each other (n = 12), were tested for maternal aggression on post partum day 7, or 10 days after the first delivery, respectively. Sister (n = 14) and nonsister pairs (n = 16) did not differ in cumulative values of post partum aggression or in the extent to which aggression was balanced within the pair. The aggressive behavior of each female was not correlated with her relative proportion of pups in the litter. Rather, the combined scores of aggression within the pairs were found to be positively correlated with the cumulative litter size. The analysis of mouse litter defence behavior shows that, under conditions of communal nesting, kinship does not seem to affect parental investment in the young significantly. Rather, the cumulative litter size could be used by paired females as a major indicator for parental investment allocation.     

Factors influencing the temporal relationship between alcohol consumption and experiences with aggression among college women.

The authors assessed temporal relationships among alcohol use, aggression, and mood using daily data from 179 college women. Participants called an interactive voice response system over an 8-week period. The odds of experiencing verbal, sexual, and physical aggression (odd ratios = 2.25, 19.44, and 11.84, respectively) were significantly higher on heavy drinking days (M = 7.46 drinks) compared to nondrinking days. Both a history of victimization and greater psychological symptom severity influenced the odds of involvement in verbal aggression. The odds of alcohol consumption were 3 times higher during the 24 hr following verbal aggression compared with days in which verbal aggression did not occur. On the day immediately following involvement in either verbal or physical aggression, positive mood decreased and negative mood increased. During the week (2-7 days) following sexual aggression, women's positive mood was decreased. These findings reinforce the need for interventions aimed at reducing heavy episodic drinking on college campuses.     

The Enjoyment of Sexist Humor,Rape Attitudes,and Relationship Aggression in College Students

The current study tested Freud's (1905/1960)theory that sexist humor may be associated withhostility toward women and extended previous researchshowing a link between hostile humor and aggression.Colleges students (N = 399 — approximately 92%white, 5% African American, and 3% other minorities)rated 10 sexist jokes on their perceived funniness.Results showed that the enjoyment of sexist humor waspositively correlated with rape-related attitudes andbeliefs, the self-reported likelihood of forcing sex,and psychological, physical, and sexual aggression inmen. For women, the enjoyment of sexist humor was only positively correlated with Adversarial SexualBeliefs and Acceptance of Interpersonal Violence. Womenalso found the jokes to be less enjoyable, lessacceptable, and more offensive than the men, but they were not significantly less likely to tell thejokes.     

College Men's Perceived Likelihood to Perpetrate Sexual Aggression

This study implemented a prospective design to explore the relationship between college men's perceived likelihood to perpetrate sexual aggression and their perpetration of sexual aggression over a three-month interim (N = 414). Compared to men's report of their likelihood to use physical force to obtain sex play or sexual intercourse, college men reported higher levels of perceived likelihood to use arguments or pressure to obtain sex play or sexual intercourse as well as drugs and alcohol to obtain sexual intercourse. Prospective analyses revealed that the majority of men who perpetrated sexual aggression over the follow-up period indicated that they were at some risk to do so at the pretest assessment. Implications for sexual assault prevention programming are discussed.     

Peer victimization in adolescence has different effects on the sexual behavior of male and female college students

We studied levels of peer victimization from an evolutionary perspective by investigating self-reported victimization during adolescence in relation to sexual behavior in college students. One-hundred and twelve (47 female) undergraduates completed self-report measures of victimization during middle and high school, onset of sexual activity, and number of sexual partners. Nearly 85% of victimization during adolescence was perpetrated by members of the same sex. Furthermore, results show that this intrasexual victimization (particularly indirect forms) was negatively correlated with reproductive opportunities in males, but positively correlated in females. Males who were frequently victimized had fewer total sexual partners and partners per year on average, while females who were often victims of aggression reported having more sexual partners and an earlier onset of sexual activity. Regression analysis revealed that demeaning, diminishing and embarrassing was the most significant predictor of the rate of sexual activity in both sexes (although this relationship was inverted between them), while teasing was the best predictor of total sexual partners in females. This evidence is consistent with evolutionary interpretations regarding human aggression and competition, as well as with recent findings suggesting that indirect victimization during adolescence is a form of intrasexual competition associated with reproductive opportunities.     

Some adrenal correlates of aggression in isolated female mice

Forty-six female mice (CFW) were isolated for a period of 23 weeks. The effect of isolation on fighting behavior was tested weekly by introducing a naive brown female mouse into the subject's home cage. Total leucocyte counts were obtained at 8 and 14 weeks of isolation. The appearance of leucopenia was used as an index of elevated adrenocortical activity. After 23 weeks of isolation all animals were sacrificed by decapitation. Plasma was collected for corticosterone assay, and paired adrenals were used to assay catecholamine levels. On the basis of the frequency and/or the absence of fighting, the mice were segregated into fighters (n = 22) and non-fighters (n = 17). Analysis of the data by Pearson's product moment correlation and Student's t-test showed that elevated sympathetic-adrenal activity was positively correlated with aggression and that elevated adrenocortical activity was negatively correlated with aggression.     

Repulsed by violence: disgust sensitivity buffers trait, behavioral, and daily aggression

Many models of aggression include negatively valenced emotions as common elicitors of aggressive behavior. Yet, the motivational direction of these emotions is not taken into account. The current work explored whether sensitivity to a negative emotion associated with behavioral avoidance-disgust-will predict lower levels of aggression. Five studies tested the hypothesis that disgust sensitivity predicts less aggression. In Study 1 (N = 92), disgust sensitivity predicted less trait physical and verbal aggression. In Study 2 (N = 268), participants high in disgust sensitivity were less likely to behave aggressively towards a stranger on a reaction-time task. In Study 3 (N = 51), disgust sensitivity was associated with less intimate partner violence inclinations. Study 4 (N = 247) replicated this effect longitudinally. In Study 5 (N = 166), each domain of disgust (i.e., moral, sexual, and pathogen disgust) had a buffering effect on daily aggression when daily experiences activated those specific domains. These results highlight the usefulness of considering the motivational direction of an emotion when examining its influence on aggression.     

ALCOHOL AND SEXUAL AGGRESSION IN A NATIONAL SAMPLE OF COLLEGE MEN

Alcohol use prior to sexual assault by both offenders and their victims may be associated with the severity of sexual aggression men commit against women. Little research has explored the pathways (e.g., social context, behavior) through which alcohol may affect outcomes of sexual attacks. The present study analyzed the role of alcohol in sexual assaults (N = 694) committed by men identified from a national sample (N = 2,972) of male college students completing a survey. Interactions of alcohol use with assault variables did not suggest any synergistic role of alcohol use in predicting sexual aggression severity. Path analysis showed, however, that offender propensity to abuse alcohol and victim preassault alcohol use were each both directly and indirectly related to sexual aggression severity, whereas offender preassault alcohol use was not directly related to sexual aggression severity. This study suggests that alcohol use plays both direct and indirect roles in the outcomes of sexual assaults. Rape and alcohol abuse prevention efforts can benefit from incorporating information about alcohol's role in different assault contexts.     

Social-information-processing factors in reactive and proactive aggression in children's peer groups

We examined social-information-processing mechanisms (e.g., hostile attributional biases and intention-cue detection deficits) in chronic reactive and proactive aggressive behavior in children's peer groups. In Study 1, a teacher-rating instrument was developed to assess these behaviors in elementary school children (N = 259). Reactive and proactive scales were found to be internally consistent, and factor analyses partially supported convergent and discriminant validities. In Study 2, behavioral correlates of these forms of aggression were examined through assessments by peers (N = 339). Both types of aggression related to social rejection, but only proactively aggressive boys were also viewed as leaders and as having a sense of humor. In Study 3, we hypothesized that reactive aggression (but not proactive aggression) would occur as a function of hostile attributional biases and intention-cue detection deficits. Four groups of socially rejected boys (reactive aggressive, proactive aggressive, reactive-proactive aggressive, and nonaggressive) and a group of average boys were presented with a series of hypothetical videorecorded vignettes depicting provocations by peers and were asked to interpret the intentions of the provocateur (N = 117). Only the two reactive-aggressive groups displayed biases and deficits in interpretations. In Study 4, attributional biases and deficits were found to be positively correlated with the rate of reactive aggression (but not proactive aggression) displayed in free play with peers (N = 127). These studies supported the hypothesis that attributional biases and deficits are related to reactive aggression but not to proactive aggression.     

Culture-specific models of men's sexual aggression: intra- and interpersonal determinants

The role of intra- and interpersonal variables was examined in samples of Asian American (N = 91) and European American (N = 377) men. A path model for Asian American men suggested 2 interpersonal paths and 1 intrapersonal path to sexual aggression. For Asian Americans, concern about social standing is a risk factor among those who hold misogynous beliefs and who use alcohol before sex. Concern about the negative reputational impact of sexual aggression is a protective factor among Asian Americans who do not hold these negative attitudes. A European American model suggested only an intrapersonal path to sexual aggression consisting of misogynous beliefs, with interpersonal variables not being predictive of sexual aggression. These results suggest both individualist and collectivist determinants of Asian American sexual aggression, whereas only individualist determinants were found for European American sexual aggression.     

Idiomatic Communication and Interpersonal Solidarity in Friends’ Relational Cultures

This study examined the relationship of interpersonal solidarity to various aspects of idiomatic communication in friends’ relational cultures. A pilot study determined that the typology of idiom functions used in past investigations of romantic relationships could be extended to friendship. The idioms described functioned to name activities, emotional states, objects, and places; communicate affection; manage confrontations; accomplish greetings and goodbyes; reference the self, partner, or other individuals; issue requests and insults; and denote sexual matters. In the main study, 114 females and 117 males each identified a close same-sex friend, completed the Interpersonal Solidarity Scale, and filled out an idiom report form for each idiom that had emerged in the friendship. The majority of the 1,380 idioms reported were verbal, used in public contexts, and used in more than just the one friendship described. For both sexes, solidarity was positively correlated with five idiom categories: activities, affection, confrontation, nicknames for self, and objects. In addition, solidarity correlated positively with place, requests, nicknames for friend, and sexual references for females and with emotions, greetings/goodbyes, labels for others, and teasing insults for males. For both sexes, solidarity was related to the total number and breadth (diversity) of idioms reported, as well as to other features of friends’ idiomatic codes. A subset of the idiom variables collectively accounted for over one third of the variance in, solidarity. Support was also found for several hypothesized sex differences in the structure and use of idiomatic codes. Associations among idiom function, channel, patterns of use, and relational consequences were also explored.     

The effects of alcohol intoxication and sexual interest on men's sexual persistence and hostility in a dating simulation

Perpetrators of sexual assault are often intoxicated; however, few experimental studies evaluate alcohol's “in the moment” effects on sexual aggression. This study extends past theory and research by examining the acute effects of alcohol on men's decisions about how to respond to sexual refusals in a dating simulation. Men (N = 62) ages 21–29 were randomly assigned to consume alcohol (target breath alcohol level 0.080%) or no alcohol. Participants were encouraged to talk to a simulated woman and act as they would on an actual date. They made choices from a list which included nonsexual and sexual options. The female agent was programmed to engage in some sexual activities but refuse others. Refusals became more intense if participants persisted. Negative binomial regression analysis was used to test a path analytic model. As predicted, participants' self‐reported desire to have sex was positively associated with choosing more consensual sexual activities during the simulation (i.e., activities in which the woman willingly engaged). Consensual sexual activities were positively associated with the number of times participants persisted after the woman refused. Alcohol moderated this relationship such that it was stronger for intoxicated men than sober men. The more sexual refusals participants received, the more hostile verbal comments they made to the woman. Contrary to our predictions, this relationship was not moderated by alcohol condition. Because participants had multiple opportunities to escalate their aggression or desist, this paradigm provides new insights into the mechanisms through which intoxication enhances the likelihood of sexual aggression in dating situations.

     

Assessing aggression in adolescent romantic relationships: can we do it better?

Almost all research on aggression in adolescent romantic relationships makes use of 1-time, retrospective assessment methods. In the present research, the authors compared data on the experience of adolescent relationship aggression (physical aggression and threatening behavior) collected from 125 high school students via 2 methods: (a) a 1-time, 2-month retrospective assessment and (b) a cumulative method based on four 2-week retrospective assessments, each spaced 2 weeks apart. For the cumulative method, data from the 4 assessments were aggregated to cover the same time period as the single, 2-month retrospective assessment. A greater proportion of the sample (48.0%) reported experiencing physical aggression using the cumulative method compared with the single, 2-month retrospective method (27.0%). The prevalence of threatening behavior was also higher using the cumulative method (48.8% vs. 24.8%). Adolescent trauma and anxiety symptoms correlated more strongly with physical aggression data derived from the cumulative method than from the 1-time assessment method.     

Reactive and proactive aggression: stability of constructs and relations to correlates

The authors examined short-term temporal stability of reactive and proactive aggression, as well as short-term consistency of differential relations of reactive versus proactive aggression to 4 correlates. The authors used parent, teacher, peer, and self-report measures twice across 1 year to assess reactive aggression, proactive aggression, hyperactivity, social skills, anger expression, and depressive symptoms of 2nd-grade boys and girls (N = 57). Both subtypes of aggression remained stable across the year, even when the other subtype of aggression was explained at each assessment. Reactive aggression, but not proactive aggression, was consistently positively related to hyperactivity, poor social skills, and anger expression at each assessment.     

Aggression, conflict resolution, popularity, and attitude to school in Russian adolescents

The objective of the present study was to examine the effects of aggression and conflict-managing skills on popularity and attitude to school in Russian adolescents. Three types of aggression (physical, verbal, and indirect), constructive conflict resolution, third-party intervention, withdrawal, and victimization were examined using the Peer-Estimated Conflict Behavior (PECOBE) inventory [Bjorkquist and Osterman, 1998]. Also, all respondents rated peer and self-popularity with same-sex classmates and personal attitude to school. The sample consisted of 212 Russian adolescents (101 boys, 111 girls) aged between 11 and 15 years. The findings attest to significant sex differences in aggression and conflict resolution patterns. Boys scored higher on physical and verbal aggression, and girls on indirect aggression. Girls were socially more skillful than boys in the use of peaceful means of conflict resolution (they scored higher on constructive conflict resolution and third-party intervention). The attributional discrepancy index (ADI) scores were negative for all three types of aggression in both sexes. Verbal aggression is apparently more condemned in boys than in girls. ADI scores were positive for constructive conflict resolution and third-party intervention in both genders, being higher in boys. In girls, verbal aggression was positively correlated with popularity. In both sexes, popularity showed a positive correlation with constructive conflict resolution and third-party intervention, and a negative correlation with withdrawal and victimization. Boys who liked school were popular with same-sex peers and scored higher on constructive conflict resolution. Girls who liked school were less aggressive according to peer rating. They also rated higher on conflict resolution and third-party intervention. Physical aggression was related to age. The results are discussed in a cross-cultural perspective.     

Risk Factors of Sexual Aggression and Victimization Among Homosexual Men1

This study examined risk factors of sexual aggression and victimization among homosexual men (N= 310). They completed the Homosexual Experiences Survey to record sexual aggression and victimization and provided information about 2 groups of potential risk factors: childhood abuse and sexual lifestyle (number of partners, age at first intercourse, age at coming out, accepting or paying of money for sex, and rape proclivity). One in 4 respondents reported severe forms of sexual victimization; 17% reported moderate victimization. Prevalence of perpetration of sexual aggression was almost 20% for severe aggression and 9% for moderate aggression. The risk of victimization increased as a function of childhood abuse as well as high number of partners and acceptance of money for sex. The risk of committing sexual aggression was positively related to childhood abuse, acceptance and payment of money for sex, high number of sexual partners, and rape proclivity. The findings are discussed in relation to evidence on heterosexual aggression.     

Gender Differences in Narcissism and Courtship Violence in Dating Couples

The current study explored the relationship between courtship violence and the exploitativeness/entitlement factor of overt narcissism, covert narcissism, and sexual narcissism. Data were analyzed from 63 currently dating couples on their own and partner’s aggression using the CTS2. All were white, heterosexual students from a small US college in Central Pennsylvania. An interdependence analysis showed that correlations were entirely explained at the individual-level, thus demonstrating that gender is a key element in understanding narcissism and courtship violence. For women, exploitativeness/ entitlement was significantly correlated with sexual coercion in both dating partners. For men, covert narcissism was correlated with physical assault and sexual narcissism was correlated with their partner’s sexual coercion. Narcissism also influenced some discrepancies in self- and partner-rated aggression.     

Defensive aggression in terns: Effect of species,density, and isolation

Defensive aggression was examined in seven species of terns during the hatching period when young are most vulnerable and adults most responsive. Aggression toward an unfamiliar person varied with respect to species, flush distance, approach distance, number of birds overhead and diving, and number of dives per 2 min for all birds and the nest owner. Defensive aggression involved birds circling over and diving at the experimenter. Generally, flush distance was negatively correlated with nest density, while the number of birds diving was positively correlated with the nest density. The number of birds diving was positively related to the number of dives, dives by the owner, and the number overhead.     

COLLEGE WOMEN'S AGGRESSION IN RELATIONSHIPS:THE ROLE OF CHILDHOOD AND ADOLESCENT VICTIMIZATION

Despite growing evidence suggesting that women engage in verbal and physical dating aggression, there is a dearth of research examining the predictors of women's engagement in these behaviors. Utilizing a college sample, the purpose of the current study was to explore women's perpetration of dating aggression within the context of victimization experiences. Women ( N  = 374) completed surveys at the beginning and end of a 10-week academic quarter for course credit. Results from two retrospective regression analyses (all Time 1 variables) suggested that (1) paternal physical abuse and adolescent/adulthood verbal victimization predicted women's reports of verbal perpetration and (2) childhood sexual abuse, adolescent/adulthood verbal victimization, adolescent/adulthood physical victimization, and adolescent/adulthood verbal perpetration predicted women's reports of physical perpetration. Results from the two prospective, longitudinal regression analyses suggested that (1) verbal perpetration (as measured at Time 1) and verbal victimization over the interim predicted women's reports of verbal perpetration over the interim and (2) physical perpetration (as measured at Time 1), verbal perpetration over the interim, and physical victimization over the interim predicted women's reports of physical perpetration over the interim. These data suggest the importance of considering previous victimization experiences, mutual partner aggression, and a history of aggressive behaviors when examining women's use of aggression in dating relationships.