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doi: 10.1002/1098-2337(1986)12:1<1::AID-AB2480120102>3.0.CO;2-1pmid: N/A
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.
Ramirez, J. Martin; Delius, Juan D.
doi: 10.1002/1098-2337(1986)12:1<13::AID-AB2480120103>3.0.CO;2-#pmid: N/A
Pigeons attack or threaten animate and inanimate targets. The assessment of their aggressiveness was studied by exposing them in their home cages to three different stimuli: the experimenter's hand, a live pigeon, and a rear‐projected conspecific image when the birds were exposed to intermittent access to food. A positive correlation between the hand test and live pigeon test was evident, but no relationship between either of these responses and the response to a pictorial image was observed. These results combined with other ethological observations cast doubts on the usefulness of schedule‐induced responses to pictorial targets in the assessment of the individual aggressiveness in pigeons, but suggest that the hand test is an adequate and reliable procedure for such evaluations.
doi: 10.1002/1098-2337(1986)12:1<21::AID-AB2480120104>3.0.CO;2-1pmid: N/A
Forty‐four male prison inmates convicted for violent offences were interviewed, and details of current offence, previous convictions for violence, prison incidents, and violent situations outside of prison were obtained from each offender. Information on victim, circumstances, precipitating events, type of violence, emotions at the time, and the like, was derived for 246 violent incidents. Cluster analysis revealed eight clusters: “criminal” violence to familiar victims, peer violence within prison, domestic violence, peer violence in pubs, gang violence, violence to staff in prison, “criminal” violence to unknown victims with accomplices, and public violence against younger victims. Results were discussed in terms of treatment of violent offenders, with special emphasis on Social Skills Training.
Ohbuchi, Kennichi; Saito, Megumi
doi: 10.1002/1098-2337(1986)12:1<33::AID-AB2480120105>3.0.CO;2-Spmid: N/A
Sixty Japanese female students were asked to exchange shocks in electric roulette games with female opponents. The subjects were assigned to either the 80%, 50%, or 20% win conditions. Half of them were then led to judge that the power unbalance was legitimate by being informed that the assignment was based on a prior performance contest, with the good performer being assigned to the advantageous position. The other subjects were led to perceive the power imbalance as illegitimate by being informed that the assignment was randomly decided. The opponents always severely attacked them. The retaliation by the subjects was analyzed by a two‐way ANOVA with Power Imbalance and Legitimacy. It was found that the subjects both in the 20% and 50% win conditions set more intense shocks to their opponents than those in the 80% win condition. This is not consistent with the fear of retaliation hypothesis which had predicted that the subjects would refrain from intensely aggressing against the opponent who had a greater aggressive capacity. It was also found that in the 80% win condition, the subjects set more intense shocks when the unbalance had been determined by their performance than when determined by luck, whereas in the 20% win condition, they set more intense shocks when the imbalance had been determined by luck than when determined by their performance. These suggest that retaliation depended upon perceived justifiability of aggression which was predicated on the legitimacy of the power imbalance. Finding in the 50% win condition that the shock settings were higher when the power imbalance had been determined by their performance than when determined by luck was interpreted in terms of their heightened competitiveness.
Scott, J. P.; Bradt, D.; Collins, R. L.
doi: 10.1002/1098-2337(1986)12:1<41::AID-AB2480120106>3.0.CO;2-Upmid: N/A
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.
Blanchard, D. Caroline; Graczyk, Barry; Blanchard, Robert J.
doi: 10.1002/1098-2337(1986)12:1<45::AID-AB2480120107>3.0.CO;2-Fpmid: N/A
Community college students rated brief segments of violence from films selected to represent a variety of approaches to the depiction of violence. Men and women differed substantially on these sequences, men seeing them as more enjoyable, amusing, realistic, and emotional. Men also showed less inclination to restrict showing of such sequences to children, on television, or by X‐rating. While no sex differences appeared in ratings of suffering or overall appraisals of violence, women' enjoyment ratings declined precipitously for the films rated as depicting more suffering, while those of men did not. However, both men and women saw more violence in sequences emphasizing suffering of characters, even when this ran counter to actual physical damage depicted. For men, enjoyment of these violent media excerpts and self‐reports of recent physical violence were essentially unrelated, while women showed highly significant positive relations for the two variables. These findings suggest that the dynamics of violence for men and women may be different enough to make differential analysis by sex an especially productive research tactic.
doi: 10.1002/1098-2337(1986)12:1<57::AID-AB2480120108>3.0.CO;2-5pmid: N/A
Within the framework of modern evolutionary theory, arguments are reviewed that the nonlegal equivalent of aggressive criminal behavior may have evolved by natural selection among mammals, particularly primates, as part of their overall approach to reproduction. If so, the commission of aggressive crimes (or their nonlegal equivalent) by humans, and even efforts to prevent fellow social group members from being victimized by aggressive crimes, may also be partially explainable in natural selection terms. The plausibility of this deduction was explored, first, by specifying the three elements that a human act must have to be regarded as an aggressive crime. Summarily, these were that (1) injury to a victim must be a likely result of the act, (2) the act must be intended, and (3) the act must elicit negative responses from those witnessing it. The primate behavior literature was examined for evidence that some behavior of nonhumans met all three conditions. Affirmative results were obtained. Therefore, while further research is in order, human aggressive criminal behavior, as well as human efforts to control it, seem to have close parallels in other primates. This would be consistent with the notion that aggressive criminal behavior (along with its condemnation by fellow group members) is part of a social system produced and sustained by natural selection.
doi: 10.1002/1098-2337(1986)12:1<73::AID-AB2480120109>3.0.CO;2-Cpmid: N/A
doi: 10.1002/1098-2337(1986)12:1<75::AID-AB2480120110>3.0.CO;2-Wpmid: N/A
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