Motivational systems of agonistic behavior in muroid rodents: A comparative review and neural model

The data on agonistic behavior of muroid rodents that have been obtained from field observations and laboratory experiments are reviewed and compared in terms of a hypothetical model of the neural organization of these behaviors. The neural model has been presented elsewhere and is used here only as a way to organize the data. The data are organized in terms of four hypothetical motivational systems: Offense, defense, submission, and patrol/marking. The various behaviors are considered as motor patterns and are compared and analyzed in terms of the proposed motivating, releasing, and directing stimuli of the motivational systems. Interactions and overlaps between the motivational systems are also considered. It is concluded that the organization of agonistic behavior may be similar across all species of muroid rodents. Generalizations are complicated by the profound effects of ontogenetic factors. Four categories of behaviors differ from species to species: Scent-marking, submissive behaviors, threat behaviors, and alarm signals. The possible phylogenetic and ontogenetic factors in these differences are considered.     

Aggression and conventional rule violation among adolescents: Social-reasoning predictors of social behavior

The goal of the current study was to determine whether aggressive and conventional rule-violating behaviors could be predicted by social-cognitive beliefs and values regarding aggression and conventional rule violations. The extent to which adolescents (N = 398; grades 9 through 12) engaged in both aggressive behavior and conventional school rule violations was assessed using self-ratings and peer nominations. Results indicated that aggressive and conventional rule-violating behaviors were predicted by (1) beliefs about the legitimacy of aggressive and convention-violating behavior; (2) values placed on the expected outcomes of these acts, such as negative self-evaluations, peer disapproval, and tangible rewards; and (3) beliefs about the effects of these acts on others. Furthermore, the results indicated that aggressive and conventional transgressions were predicted better by beliefs and values within the same social-cognitive domain than across domains. In contrast to females, male students committed more aggressive acts and conventional rule violations and reported beliefs and values that were more supportive of aggressive behavior and conventional rule-violating behavior. However, gender differences in beliefs and values were greater for aggressive acts than for conventional acts. The results support the need to distinguish between behavioral domains when attempting to predict social behavior. Aggr. Behav. 24:347–365, 1998. © 1998 Wiley-Liss, Inc.     

Aggression and prosocial behaviors in social conflicts mediating the influence of cold social intelligence and affective empathy on children's social preference

This study proposes a model in which aggressive and prosocial behaviors exhibited in social conflicts mediate the influence of empathy and social intelligence to children's social preference by same‐sex peers. Data were obtained from kindergarten to the end of the first grade. The sample yielded 117 Spanish children (64 girls and 53 boys) with a mean age of 62.8 months (SD = 3.3) at the beginning of the study. For boys, affective empathy contributed to boys’ social preference through a decrease in physical aggression as responses to social conflict. For girls, affective empathy had an indirect effect on girls’ preference by increasing assistance to others in their conflicts. No mediating effect in the contribution of social intelligence on girls’ social preference was detected. Our results suggest that, only for girls, cold social intelligence can promote both indirect aggression (coercive strategic that do not leave social preference, at least at these ages) and behaviors that lead social preference (such as prosocial behaviors).     

Violence and the disaggregated society

This paper reviews the evidence that social disaggregation is a major cause of destructive violence in non-human animal societies. The multifactorial theory of agonistic behavior is modified into a polysystemic theory which relates factors on each level to each other in an integrated model. As a result, it is suggested that disaggregation of systems on any level may lead to maladaptive violence. On theoretical grounds it is concluded that disaggregations of ecosystems and social systems are more probable and hence more dangerous than those of physiological and genetic systems. Applications of these findings to human affairs are discussed, both as explanations and as guides to positive action.     

Religious Prosociality and Aggression: It's Real

Individual religiosity relates to prosocial attitudes, behavioral intentions, and behaviors of minimal (no/low cost; limited to in‐group members) prosociality in hypothetical situations. Yet evidence on religious prosociality through other‐oriented, costly helping behavior in real life is still to be documented. Similarly, religiosity relates to cognitive, emotional, and attitudinal components of prejudice toward moral out‐groups. Evidence on real behavior of prejudice is nevertheless still needed. In two experiments using the same measure of religiosity and samples from the same population, religiosity predicted helping, in a real‐life context, of an in‐group member in need (Experiment 1) as well as overt and direct aggression by means of allocating hot sauce to a gay, but not to a neutral, target (Experiment 2). Religious prosociality and aggression are real, concern distinct kinds of targets, and are at the heart of personal religiosity.     

Further experiments on the social interactions of domestic “Norway” rats

Domestic rats, Rattus norvegicus, aged nearly one year, were studied in artificial colonies in large cages with attached nest boxes. As in previous experiments on younger domestic rats, but not those on wild rats, the colonies were peaceful. Questions concerning the “aggressive” or “agonistic” behavior of domestic rats are further discussed.     

Callous-Unemotional Traits,Relational and Social Aggression,and Interpersonal Maturity in a Sample of Behaviorally Disordered Adolescents

The authors examined the degree to which callous-unemotional traits and narcissism predict relational aggression, social aggression, and prosocial skills in a sample of 79 adolescent offenders (13–18 years old; 26% girls; 74% boys) attending a school for youth with behavior disorders in the Mid-Atlantic United States. Narcissism made a significant contribution to the prediction of both relational aggression and social aggression, accounting for most of the unique variance in the prediction of these indirect forms of aggression. Conversely, callous-unemotional traits—but not narcissism—made a significant contribution to the prediction of lower prosocial skills. Furthermore, in contrast to the large number of studies indicating gender differences in the expression of aggression, no significant gender differences in the present study were found.     

Genotype and environment in the social interactions of wild and domestic “Norway” rats

Wild rats, Rattus norvegicus, (a) trapped as adults or (b) of the second generation in captivity (lab-wild), and domestic rats of two strains, were studied for 28 days in artificial colonies in large cages with attached nest boxes. Controls were kept in mated pairs in small cages. Each colony consisted of six males and six females. The interactions of the males in six colonies of trapped rats were highly “stressful;” 61% died; and most of the survivors lost weight and had greatly enlarged adrenals. In each colony, however, there was a male (an alpha) that gained in weight and spent much time, during the dark hours, in the open on the floor of the cage; and in three colonies there were also other males (“betas”) that gained in weight. The adrenals of alphas and betas weighed about the same as those of the controls. In one of the 12 colonies of domestic rats one male behaved like a wild male; but in the other colonies the males gained in body weight and their adrenal weights resembled those of the controls. In three colonies of lab-wild rats 22% of the males died, but there was no evidence of males of different status. The findings confirm that the “agonistic” behavior of domestic rats is usually much attenuated in comparison with that of the wild type; a number of methodologic implications are discussed.     

A Cross-Cultural Investigation of Relational and Social Aggression in Female College Students from Puerto Rico and the United States

Researchers compared scores on a self-report measure of relational and social aggression using 2 groups, European American female university students (M = 20.23 years, SD = 3.88) from the mid-Atlantic region of the United States and Hispanic females from Puerto Rico (M = 19.34 years, SD = 1.26). Results indicate that cultural differences were evident in the use of relational and social aggression. The exclusively Hispanic Puerto Rican sample reported being more socially aggressive than the European American, mid-Atlantic sample. In contrast, the European American sample identified as being more relationally aggressive in their relationships than the Hispanic Puerto Rican sample. This distinction allows us to consider potential cultural differences in interpersonal relations in college-age females.     

Adolescent Female Aggression: Functions and Etiology

Despite the narrowing gap between male and female use of aggressive behavior, much of the extant aggression research has centered on males. Various internal, or psychological factors, including attachment, emotion regulation, and impulsivity, are typically examined independently from external, or social, factors, such as the quality of the family environment and exposure to community violence. Additionally, the studies rarely distinguish among forms and functions of aggression. The current study was the first to simultaneously examine these factors and their relationships to the distinct functions of aggression in a low-income urban community sample of adolescent females. Participants (N = 214) were recruited from grades 8 through 12 at a diverse all-girls public school in a city in the northeastern United States. Results indicated that greater attachment security and emotion regulation reduced the impact of a more negative family environment upon the use of reactive and proactive aggression. The results also demonstrated that impulsivity and the family environment mediated the relationships between exposure to community violence and the presence of reactive aggression. With higher levels of impulsivity, an increased use of reactive aggression was demonstrated. Lastly, in the context of greater exposure to community violence, a positive family environment decreased the use of reactive aggression. Overall, the results from this study suggested the role of these internal and external factors in the development of aggressive behavior in female adolescents. Further empirical experimental investigation may shed light on the most optimal interventions to prevent the development of aggression.     

Links Between Stressful Life Events and Proactive and Reactive Functions of Aggression

Recently, more attention has been devoted to understanding how stressful life events might relate to proactive and reactive aggression. Findings suggest that stressful life events are more strongly linked to reactive, than proactive, aggression; however, it is unclear whether the impact of stressful life events on proactive and reactive aggression might vary as a function of the level of exposure to or type of stressful life event. The current study examined how level of exposure to stressful life events (i.e., witnessed, experienced, and learned about) and stressful life event types (i.e., war zone exposure, sexual victimization, interpersonal violence, and other trauma exposure) related to proactive and reactive aggression. The sample was comprised of 500 undergraduate students (M = 18.96, SD = 1.22, 49.6% male) recruited from a Midwestern university. Findings indicated that all three levels of stressful life event exposure (i.e., experienced, witnesses, and learned) were associated with reactive aggression; however, only witnessed stressful life events were associated with proactive aggression. Clinical implications and future directions are discussed.     

Modifying Social Aggression in Schools

The paper identifies aspects of subtle social aggression in the school environment that can make children and staff feel quite miserable and unsafe, and which will thus likely impair a child's capacity to learn, and a teacher's capacity to teach. Unaddressed power dynamics created by the interaction and attitudes of those in the social context are defined, and the interpersonal dynamics of the abdicating bystander described. A randomized controlled trial of an intervention for elementary schools is described briefly, which attempts to modify social aggression.     

Evolution of Destructive Aggression

Aggression is defined as a mechanism of spacing by means of force or displays. It has evolved independently in different animal groups. The mechanisms underlying it are therefore not homologous throughout the animal kingdom. The phenomenon of aggression is so widespread, however, that strong selection pressures must be responsible for its development along analogous lines. Its most obvious functions are in competition for mates, natural resources, and territories, and in the preservation of group identity in many gregarious species. Aggression is often ritualized so that no damage is done to conspecifics. This ritualization may appear as modification of fighting into a tournament, or as the development of submissive postures which block further aggression in the opponent shortly after the onset of a potentially damaging fight. Animal aggression is preprogrammed by phylogenetic adaptation in well-defined ways, but can be modified by experience. The inborn programs involve motor patterns, innate releasing mechanisms, releasers, motivating mechanisms, and learning dispositions specific for the species. Aggression on this biological level can be observed in humans as intragroup aggression. Certain motor patterns and signals which lead to the release of aggression are universal. Some can even be found in deaf- and blind-born people, proving their innateness. A number of patterns of aggression in man are highly ritualized and - in a way analogous to that found in many animals - mechanisms of control have evolved inhibiting the killing of a conspecific. There are strong indications of the existence of motivating mechanisms within the brain, e.g., in the form of neuronal circuits, that show a degree of spontaneity. The type of destructive aggression which we call war, is a product of cultural evolution. War takes advantage of the given motivational structure of man, including his fear of strangers, which develops in every baby independently of experience and makes men inclined to form closed groups and causes them to be wary of or hostile to strangers. Based on these tendencies, man underwent a process of cultural subspeciation. Groups demarcated themselves from others by custom, erecting communication barriers. The development of languages demonstrates how fast and efficient this process is. Members of the same group, during this process, were defined as the “real man,” outsiders often were to be valued less -or even considered nonhuman. On the basis of this self-indoctrination, cultural codes of conduct developed, which allowed members of other groups to be killed when groups competed for resources. A cultural fiiter of norms was established which demanded killing under defined conditions, and was superimposed upon the biological filter of norms which inhibits the killing of a human being. This results in a conflict of norms, which is universally felt as guilt, since the biological filter of norms, though superimposed, is nonetheless working, particularly in the circumstance of a personal encounter. The more advanced the technique of armament, which allows fast and distant killing, the less the inhibitions are activated. Nonetheless, ritualizations occur on the cultural level. Warfare is sometimes ritualized and conventions are developed to prevent escalation into massacres, or the wholesale destruction of the subjugated enemy. To a great extent, this is certainly a result of our inborn moral code, If nothing like this were given to man our situation would be disastrous indeed. Whether cultural evolution will, in the future, be guided by moral maxims in accord with our human nature is a deeision men must make rationally. Although a ruthless ethnocentrism may bring advantage to a warring group, this may eventually prove fatal to mankind as a whole. In the escalating competition mankind runs the danger not only of exhausting its resources, but of destroying itself with its new weapons. If the outcome were not selfdestruction but domination by one group it would impoverish the diversity of human cultures, and thus seriously cut down man's spectrum of adaptability. War fulfills certain functions, similar to those found in animals. It is mainly a mechanism for preserving and extending one's territory, and a means of getting access to scarce resources. It is therefore dangerous to consider war merely as a pathological form of human behavior because this may distract our attention from the fact that, h order to overcome war, the functions of war have to be fulfilled by nonviolent means. Cultural evolution phenocopies biological evolution, due to similarities in the selection pressures shaping its course. This allows us to define the point of the evolutionary spiral we are at currently and to predict our future course.     

The effect of ethanol treatment on social behavior in male rats

The effect of 0.50 g/kg of EtOH in male rats interacting with a stimulus male juvenile in a newly developed test of social interaction was examined. The adult male rats were treated with EtOH (8.0 to 12.0 g/kg/day) or equicaloric dextrin maltose for 2 weeks (studies 1 and 2) or 8 weeks (study 3) and social interaction was assessed both before and after chronic drug treatment was ended in study 1 and after chronic drug treatment was ended in studies 2 and 3. It was found that prior to chronic drug treatment, in study 1, 0.50 g/kg of EtOH increased both aggressive behavior and time spent interacting with the stimulus juvenile male from the first presentation of the juvenile to the second presentation (20 min apart) while saline injection decreased it. After chronic drug treatment was ended, in study 1 animals treated chronically with EtOH were more aggressive when they were not intoxicated than when they had been treated with 0.50 g/kg of EtOH. In studies 2 and 3, after chronic drug treatment was ended, aggressive behavior and time spent interacting with the juvenile were greater in the animals treated chronically with EtOH, regardless of whether they were injected with saline or 0.50 g/kg of EtOH. The results of these studies showed that chronic EtOH treatment can produce long-lasting changes in social behavior after drug treatment is over and can alter the animal's normal response to EtOH in a social setting.     

Relational and Social Aggression and Reflective Processing in a University Sample

This study examined whether the dimension of reflective processing (e.g., deep and elaborative processing) was connected to the use of relational aggressions, social aggression, or both. A convenience sample of 629 college students (66% female, 91.6% White) was surveyed to ascertain the relation between self-reported relational and social aggression and deep and elaborative processing. The overall multivariate regression model was significant, Wilks’s λ = .12, F(4, 2162) = 1010.80, p < .001. Univariate results were used to show that the two predictors (relational and social aggression) significantly and strongly positively predicted the use of deep processing, R² = .81, p < .001, as well as the use of elaborative processing, R² = .87, p < .001. In summary, higher levels of social and relational aggression were related to higher levels of deep and elaborative processing. Implications for these findings are presented.     

Fighting in female mice in lines selected for laterality

Male and female mice from the Collins HI and LO laterality strains were isolated for 3–5 days. Thereafter on Day 1 each was given the Intruder Test followed by a Training Test; the latter was repeated 1 week later. All males of 36 days or older fought vigorously, but without line differences. Females of the HI strain showed higher numbers of fighters and greater intensity of fighting than those of the LO strain, and by the second Training Test these differences were significant at p < 0.01. The HI and LO laterality strains thus provide useful tools for investigating the functions of female agonistic behavior and the possible relationship between laterality and the expression of aggression.     

Predicting dating behavior from aggression and self‐perceived social status in adolescence

We investigated the longitudinal associations between self‐reported aggression, self‐perceived social status, and dating in adolescence using an intrasexual competition theoretical framework. Participants consisted of 536 students in Grade 9 (age 15), recruited from a community sample, who were assessed on a yearly basis until they were in Grade 11 (age 17). Adolescents self‐reported their use of direct and indirect aggression, social status, and number of dating partners. A cross‐lagged panel model that controlled for within‐time covariance and across‐time stability while examining cross‐lagged pathways was used to analyze the data. The findings revealed that direct aggression did not predict dating behavior and was negatively associated with self‐perceived social status in Grade 10. Self‐perceived social status in Grade 9 was positively associated with greater use of indirect aggression in Grade 10. Regarding dating, in Grade 9, self‐perceived social status positively predicted more dating partners the following year, while in Grade 10, it was higher levels of indirect aggression that predicted greater dating activity the following year. Overall, there were no significant sex differences in the model. The study supports the utility of evolutionary psychological theory in explaining peer aggression, and suggests that although social status can increase dating opportunities, as adolescents mature, indirect aggression becomes the most successful and strategic means of competing intrasexually and gaining mating advantages.

     

Social-Cognitive and Behavioral Correlates of Aggression and Victimization in Boys' Play Groups

A contrived play group procedure was utilized to examine the behavioral and social-cognitive correlates of reactive aggression, proactive aggression, and victimization via peers. Eleven play groups, each of which consisted of six familiar African-American 8-year-old boys, met for 45-min sessions on five consecutive days. Social-cognitive interviews were conducted following the second and fourth sessions. Play group interactions were videotaped and examined by trained observers. High rates of proactive aggression were associated with positive outcome expectancies for aggression/assertion, frequent displays of assertive social behavior, and low rates of submissive behavior. Reactive aggression was associated with hostile attributional tendencies and frequent victimization by peers. Victimization was associated with submissive behavior, hostile attributional bias, reactive aggression, and negative outcome expectations for aggression/assertion. These results demonstrate that there is a theoretically coherent and empirically distinct set of correlates associated with each of the examined aggression subtypes, and with victimization by peers.     

A Meta-Analysis of the Distinction between Reactive and Proactive Aggression in Children and Adolescents

The present meta-analytic review aimed to clarify divergent findings concerning the relation between reactive and proactive aggression in children and adolescents. Fifty-one studies with 17,965 participants were included in the analysis. A significant correlation between reactive and proactive aggression was found. The strength of this relation varied considerably between studies, from -.10 to .89. Observational assessment and tilt/noise tasks were associated with smaller correlations than questionnaires. Within the large group of questionnaire studies, studies disentangling the form and function of aggression found lower correlations than studies that did not disentangle form and function. Among questionnaire studies, higher reliability was associated with larger correlations. Effect size did not depend on other study characteristics such as sample type, age, and informant type. It is concluded that reactive and proactive aggression are most clearly distinguished with behavioral observations and questionnaires that unravel form and functions of aggression.     

Everyday Marital Conflict and Child Aggression

Children's immediate aggressive responding to exposure to marital conflict was examined. Participants were 108 families with 8- to 16-year-old children (53 boys, 55 girls), with diary records of children's reactions to marital conflict in the home completed by 103 mothers (n = 578 records) and 95 fathers (n = 377 records) during a 15-day period. Child responses to analog presentations of marital conflict tactics were also obtained. Exposure to destructive conflict tactics and negative parental emotionality increased the likelihood of aggressive behavior in children when they witnessed marital conflict, whereas constructive conflict tactics and positive parental emotionality decreased the probability of aggression. Conflict topics presumed to be threatening to the child (child- or marital-related) also heightened the likelihood of aggression. Aggressive responding to conflict in both home and laboratory predicted externalizing behavior problems. Fathers' and mothers' separate diary reports, and child responses to analog presentation of conflict, provided generally consistent findings. An exposure hypothesis for marital conflict as an influence on child aggression is discussed.