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PubMed2003

Experiencing and witnessing familial aggression and their relationship to physically aggressive behaviors among Filipino adolescents.

The effects of family violence on children's aggressive behaviors have been the focus of much research. However, results have been equivocal in at least the following three areas: (a) the specific effects on aggression of child-directed violence versus child-witnessed violence, (b) the salience of family violence as an explanation of aggression when other theoretically relevant explanations of aggression are controlled (i.e., peers, attachments, or moral beliefs), and (c) the gender-specific effects of family violence. Using a probability sample of adolescents from a medium-sized city in the Philippines, this article assesses the effects of child-directed and child-witnessed violence between parents on aggressive behaviors of adolescents while controlling for theoretically relevant explanations of aggression. Results show that child-witnessed and child-directed violence are positively and significantly related to self-reported aggression, that child-witnessed violence accounts for most of the variance in adolescent aggression, and that neither measures of family violence interacts with gender.

Adaptation, Psychological↗

PubMed2006

Harm, intent, and the nature of aggressive behavior: measuring naturally occurring aggression in barroom settings.

The research goals were to use the constructs of harm and intent to quantify the severity of aggression in the real-world setting of the bar/club, to describe the range of aggressive behaviors and their relationship to harm and intent, and to examine gender differences in the form and severity of aggression. Systematic observations were conducted by trained observers on 1,334 nights in 118 bars/clubs. Observers documented a range of aggressive acts by 1,754 patrons in 1,052 incidents, with many forms of aggression occurring at more than one harm and intent level. Women used different forms of aggression, inflicted less harm, and were more likely to have defensive intent compared with men. Implications of the findings for research and measurement of aggression and applications to preventing aggression and violence are discussed.

Aggression↗

PubMed1983

Locus of control and the aggression inhibiting effects of aggressive humor appreciation.

Empirical investigation into the theoretical connection between humor appreciation and aggression has provided a continued series of equivocal results. This experiment examined the proposition that previous inconsistencies were due to the lack of concern for individual locus of control. Female subjects, differentiated as internals and externals, received either an aggression arousal induction procedure or a neutral nonarousal procedure. Subjects were presented three stimulus situations: neutral humor, aggressive humor, or nonhumorous material, and assessed for mood state. Locus of control was found to be a significant variable in the effectiveness of aggressive humor to reduce aggressive mood. Internals were able to reduce aggressive mood through appreciation of aggressive humor and demonstrated preference for this humor type. Importance of internals' cognitive style interacting with humor content was found significant in relationship between humor and aggressive reduction.

Adult↗

PubMed2005

Aggressive dream content without daytime aggressiveness in REM sleep behavior disorder.

BACKGROUND: REM sleep behavior disorder (RBD) is characterized by vigorous sleep motor activity associated with dream mentation. Patients with RBD frequently report action-filled and violent dreams. OBJECTIVE: To systematically assess dream characteristics and daytime aggressiveness in patients with RBD and controls. METHODS: Forty-nine patients with polysomnographic-confirmed RBD diagnosis and 71 age- and sex-matched controls were asked to recall the most recent dreams and to complete the Aggression Questionnaire (AQ). Forty-one patients with RBD (81.6%; 36 men, 5 women; mean age: 67.5 +/- 7.5 years) and 35 controls (49.3%; 30 men, 5 women; mean age: 69.1 +/- 5.9 years) were able to remember their dreams and a total of 98 (RBD) and 69 (controls) dreams were collected in the two groups. Verbatim dream descriptions were scored and analyzed according to the Hall and Van De Castle method. RESULTS: Patients with RBD showed a higher percentage of dream with at least one aggressive episode (DWA) than controls (66% vs 15%; p < 0.00001), a higher aggression/friendliness interaction ratio (86% vs 44%; p < 0.0001), and a greater frequency of animal characters (19% vs 4%; p = 0.0001). In contrast to controls, no patient with RBD had dreams with elements of sexuality (0% vs 9%; p < 0.0001). The two groups did not differ in total AQ scores, except for a lower score on the physical aggressiveness subscale in patients with RBD compared to control subjects (16.5 +/- 6.4 vs 20.4 +/- 8.3; p = 0.034). No correlation was observed between dream aggressiveness and age, duration, or frequency of RBD symptoms. CONCLUSIONS: Dreams in patients with REM sleep behavior disorder were characterized by an elevated proportion of aggressive contents, despite normal levels of daytime aggressiveness. Dreams with aggressiveness and the known excessive phasic muscle activity during REM sleep may be related to the hyperactivity of a common neuronal generator.

Aged↗

PubMed1999

Sex differences in beliefs about aggression: opponent's sex and the form of aggression.

Previous studies show that men endorse instrumental beliefs about aggression to a greater extent than women, whereas women endorse expressive beliefs to a greater extent than men. However, men and women indicate that they have different opponents in mind when thinking about aggression, and existing measures may emphasize physical forms of aggression. Therefore, beliefs about aggression were examined when the type of aggression (physical or verbal) and the sex of the opponent (same sex or opposite-sex partner) were specified, among a sample of 200 students. Expressive beliefs were higher and instrumental beliefs lower for an opposite-sex partner and for physical aggression. The characteristic sex difference applied across all manipulations for expressive beliefs, but not for instrumental ones: men showed higher scores than women only for same-sex physical aggression. Higher instrumental (but not lower expressive) scores were also found among those who based their responses on real rather than hypothetical events. The sex difference in instrumental beliefs for same-sex physical aggression was largely confined to respondents using a hypothetical event. As in previous studies, instrumental and expressive beliefs were relatively independent of one another. The position that the beliefs represent rhetorical devices is assessed in the light of these findings.

Adolescent↗

PubMed1993

Characteristics of aggressive-rejected, aggressive (nonrejected), and rejected (nonaggressive) boys.

95 boys at 3 developmental levels (ages 6-8, 8-10, 10-12) were selected on the basis of sociometric and aggression ratings to represent 4 groups: (1) aggressive and rejected, (2) aggressive (not rejected), (3) rejected (not aggressive), or (4) neither aggressive nor rejected. Behavioral observations, teacher ratings, peer ratings, and open-ended peer interviews were collected to characterize the behaviors of these boys in 3 social domains (conduct problems, sociability/withdrawal, and adaptability/responsivity to peer expectations). Distinct problem profiles emerged. Aggressive-rejected boys exhibited more diverse and severe conduct problems that did aggressive boys, along with greater deficiencies in the domain of adaptability. Nonaggressive rejected children were considered by teachers and peers to be shy and passive, deficient in prosocial behaviors, atypical, and socially insensitive. Grade-level decreases in physical aggression and increases in peer-reported atypical/insensitive behaviors corresponded to developmental differences in group characteristics.

Aggression↗

PubMed2001

Strain typing of polish Leptosphaeria maculans isolates supports at the genomic level the multi-species concept of aggressive and non-aggressive strains.

47 Polish isolates of the blackleg fungus Leptosphaeria maculans (Phoma lingam) were compared with eight well-defined reference strains from Germany, France, Denmark, Australia and one Polish isolate of Phoma nigrificans. The isolates were tested (i) for growth characteristics, (ii) for their ability to form sirodesmins, (iii) for cellulolytic enzymes, and (iv) for pathotype-differentiating molecular markers generated by RAPD-PCR, PCR analysis with pathotype-specific primer pairs and PFGE. With two exceptions all Polish isolates do not form sirodesmins. grow rapidly without penetrating into the substrate and form in most cases yellow or brown pigments in Czapek-Dox liquid cultures. With respect to cellulase secretion and molecular fingerprinting Polish A strains (aggressive) fit into the general picture of the aggressive pathotype group, whereas the NA isolates (non-aggressive) display a higher degree of heterogeneity. This matches with inoculation tests on rape seedlings, which revealed a considerable number of isolates ranging in aggressivity between the conventional A and NA pathotype group. Molecular fingerprinting techniques unequivocally sorted intermediately aggressive isolates into the NA pathotype group. Isolate Ph Bial, which produces sirodesmin but groups within NA isolates according to molecular and physiological markers, may represent a novel third group besides A and NA strains with intermediate aggressivity (IA). We hybridized Southern blots of electrophoretically separated chromosomes with radioactively labelled PCR fragments used for differentiation between A and NA isolates. The specificity of diagnostic PCR amplicons is reflected at the genomic level. The A probe reveals a single hybridizing chromosome exclusively in A strains. The NA probe reveals several chromosomes and is specific for the NA pathotype group. Chromosomes from intermediately aggressive strains are equally well recognized by the NA probe as are Polish isolates with low aggressivity and give no signal with the A probe. Both diagnostic DNA sequences are highly specific for the pathotype group they were derived from. The lack of correspondence of both genetic elements between A and NA strains strongly supports the idea of ascribing the pathotype groups to different species. Whereas the A pathotype group is genetically homogeneous and congruent with the species Leptosphaeria maculans, the NA group needs to be revised taxonomically. NA isolates will presumably have to be split into several independent species.

Ascomycota↗

PubMed1997

Comparative nuclear morphometric analysis of aggressive and non-aggressive squamous cell carcinomas of the skin.

Squamous cell carcinomas (SCC) are the most frequent tumours complicating organ transplantation. Whereas most SCC can be successfully treated with conventional surgery, other lesions show an aggressive course with recurrence and metastases. We assessed the value of nuclear morphometry in detecting tumours with an ab initio potential for aggressive course. Nuclear perimeter, area, feret X and feret Y were calculated semi-automatically on an image analyzer on histological sections of 15 non-aggressive, 15 aggressive and 6 recurrent SCC developed in seven organ graft recipients. We found statistically significant differences for all the parameters studied between recurrent and initially aggressive SCC, and, to a lesser extent, between non-aggressive and aggressive SCC. These results suggest that some SCC have ab initio a potential for more aggressive evolution; morphometry can be a useful adjunct in order to better study these lesions.

Adult↗

PubMed1997

Aggressive behaviour in the Chinese elderly--validation of the Chinese version of the rating scale for aggressive behaviour in the elderly (RAGE) in hospital and nursing home settings.

OBJECTIVE: The objective is to examine the validity of the Chinese version of the Rating Scale for Aggressive Behaviour in the Elderly (RAGE) in Hong Kong. DESIGN: A cross-sectional study comparing the pattern of aggressive behaviour among residents of different elderly institutions. SETTING: A nursing home and a psychogeriatric inpatient unit. PATIENTS: Psychogeriatric inpatients and nursing home residents. Thirty subjects participated in the validation study of the Chinese version of the RAGE (CRAGE). Eighty-eight subjects were assessed by the CRAGE for pattern of aggressive behaviour. MEASURES: The CRAGE and the Chinese version of the Mini-Mental State Examination (CMMSE). RESULTS: The CRAGE showed satisfactory validity and reliability measures. Aggressive episodes were found in 57% of the subjects, mostly mild in nature. No significant difference was found in the CRAGE total scores in different institutions and across diagnoses. Hospital and schizophrenic patients had significantly higher ratings in overall aggressiveness. Demented subjects had higher CRAGE ratings with CMMSE scores from 11 to 15. CONCLUSIONS: CRAGE is a valid instrument for use in the Chinese elderly. Although there is no significant difference in total aggressive episodes among different elderly institutions, chronic psychiatric patients were more frequently regarded as aggressive.

Aged↗

PubMed1989

Quantitative and comparative analyses of pro-aggressive actions of benzodiazepines in maternal aggression of rats.

The pro-aggressive effects of low doses of benzodiazepines on maternal aggression in rats were studied. Chlordiazepoxide, diazepam, oxazepam and alprazolam produced bell-shaped dose-response curves, with increased aggression at low doses. Only alprazolam significantly reduced aggression at higher doses. A comparison of the drug effects on different aggressive elements revealed that chlordiazepoxide and oxazepam increased the frequency of more elements of the aggressive repertoire than diazepam or alprazolam. Thus, although all benzodiazepine receptor agonists increased aggression, there were significant quantitative differences in their effects.

Aggression↗

PubMed1976

Correlated response in selection for aggressiveness in female mice. I. Male aggressiveness.

Males from the fifty selected generation of a selection program for aggressiveness in female Mus musculus (Ebert and Hyde, 1976) were tested to determine whether male aggressiveness showed a correlated response in selection for female aggressiveness. The results indicated that male aggression had not shown a correlated response. Differences among males from the high, control, and low lines were not statistically significant in one replication and were significant but not in the predicted order in the other replication. There were marginally significant line X sex interactions. The rank correlation between male and female aggression scores was 0.20, which was not significant. The results suggest that male aggressiveness and female aggressiveness are under separate genetic control. Data for generation S5 females are also reported; differences among the high, control, and low lines continue to be significant.

Aggression↗

PubMed1983

Aggressive experience and maternal aggression in the Mongolian gerbil.

Some recent reports suggest that female rodents which have experienced frequent aggressive encounters during lactation maintain higher levels of aggression than non-lactating controls, even after their pups are weaned. To test whether aggressive experience during lactation produced a different effect from aggressive experience at other times, three groups of female gerbils each were observed during 10 exposures to unfamiliar male intruders over a 5 week period. During week 1, lactating females were more aggressive than virginal controls. During the remaining weeks, neither lactating nor weaned females were significantly more aggressive than controls. It was concluded that the effects of repeated aggressive experience are similar whether the females are lactating or not.

Age Factors↗

PubMed1991

Aggression by a female rat cohabitating with a sterile male: termination of pseudopregnancy does not abolish aggression.

At the end of that time, each female was assessed for aggressiveness toward an unfamiliar female intruder once each week for 3 weeks. Those females displaying a high level of aggression had their male cagemate changed. For half of the females, the new male cagemate was a castrated male with a testosterone implant. For the other half, the new cagemate was a castrated male without a testosterone implant. Replacement males had been subjected to surgery 9 weeks previously. There were no differences in the aggressiveness of females of the two groups on any of 3 subsequent weekly tests of aggression. In a 3-h evaluation of male sexual behavior, none of the 9 castrated males without testosterone replacement displayed sexual activity with an estrogen/progesterone primed ovariectomized female, but 6 of 9 males with testosterone replacement did. Reanalysis of the aggression data comparing the females whose males had no testosterone replacement and females housed with the 6 males that were sexually active also revealed no differences in aggression over the 21-day test period. Since pseudopregnancy is known to last 13 days, these results indicate that the continuous presence of pseudopregnancy is not required for maintenance of aggression by a female cohabiting with a sterile male.

Aggression↗

PubMed1989

Effects of secobarbital on human aggressive and non-aggressive responding.

This study examined the effects of secobarbital on human aggressive responding in a controlled laboratory setting. Sixty minutes prior to experimental sessions, male subjects were administered either placebo or 50, 100 or 200 mg per 70 kg of body weight doses of secobarbital double-blind. During these sessions, subjects could press a button to accumulate points exchangeable for money (non-aggressive response) or press another button ostensibly to subtract points from a fictitious person (aggressive response). Aggressive responding was occasioned by subtracting points from the subject. Subjects were instructed that points were subtracted by another person. Aggressive responding was maintained by contingent presentation of periods free of point subtractions, i.e., provocations. Acute secobarbital administration produced dose-dependent decreases in non-aggressive responding, and increases in aggressive responding.

Aggression↗

PubMed2003

The psychophsiology of aggressive drivers: comparison to non-aggressive drivers and pre- to post-treatment change following a cognitive-behavioural treatment.

Twenty drivers were remanded to our treatment program by the courts following arrests related to serious aggressive driving behaviors. Ten additional drivers entered our program in response to our advertisements thus identifying themselves as aggressive drivers. Psychophysiological assessments were conducted on all 30 drivers and heart rate (HR), systolic and diastolic blood pressure (SBP and DBP), and skin resistance level (SRL) were measured in response to exposure to a mental arithmetic neutral stressor, two idiosyncratic, audio-taped, aggressive driving vignettes (audio 1 and audio 2), and one non-driving related fearful vignette. Fourteen non-aggressive driving controls also completed the assessment. The results indicated that the aggressive drivers (ADs) showed significantly more SBP responsivity during audio 1 and audio 2 and significantly less SBP reactivity during the mental arithmetic stressor than the controls. The aggressive drivers then completed a four-week, group intervention which included relaxation techniques specifically targeting aggressive driving behaviors. The same psychophysiological assessment was conducted at post-treatment. The results showed significant pre- to post-treatment decreases in HR, p<0.003, SBP, p<0.01, and DBP, p<0.02 during audio 1. Similarly, decreases were evident in audio 2 in SBP, p<0.03 only. No decreases in reactivity occurred during the neutral stressor or fearful situation.

Accidents, Traffic↗

PubMed1997

Children's normative beliefs about aggression and aggressive behavior.

Normative beliefs have been defined as self-regulating beliefs about the appropriateness of social behaviors. In 2 studies the authors revised their scale for assessing normative beliefs about aggression, found that it is reliable and valid for use with elementary school children, and investigated the longitudinal relation between normative beliefs about aggression and aggressive behavior in a large sample of elementary school children living in poor urban neighborhoods. Using data obtained in 2 waves of observations 1 year apart, the authors found that children tended to approve more of aggression as they grew older and that this increase appeared to be correlated with increases in aggressive behavior. More important, although individual differences in aggressive behavior predicted subsequent differences in normative beliefs in younger children, individual differences in aggressive behavior were predicted by preceding differences in normative beliefs in older children.

Aggression↗

PubMed1997

Characteristics of men who aggress sexually and of men who imagine aggressing: risk and moderating variables.

The authors showed that the extent to which men's personalities were self-centered rather than sensitive to others' needs moderated the connection between risk factors and sexually aggressive behavior. Men who were at risk for committing aggression but who were also sensitive to others' feelings aggressed less than the corresponding group, who had relatively self-centered personalities. However, both groups showed high levels of imagined sexual aggression. The authors suggest that imagined sexual aggression may reveal information about the presence of underlying risk factors even when actual aggression is inhibited by personality characteristics such as those studied here. The implications for therapeutic interventions of the finding of aggression attenuation are also discussed.

Adolescent↗

PubMed2005

Emotions in social information processing and their relations with reactive and proactive aggression in referred aggressive boys.

We studied emotional aspects of social information processing (SIP) and their specific relations with reactive and proactive aggression in 54 boys ages 7 to 13 who had been referred for aggressive behavior problems and a comparison group. Participants listened to vignettes concerning provocations by peers and answered questions concerning SIP, own and peer's emotions, and emotion regulation. Aggressive boys attributed more hostile intent, happiness, and less guilt; reported more anger; mentioned less adaptive emotion-regulation strategies; generated more aggressive responses; and evaluated aggressive responses less negatively than comparison boys. Hypothesized specific relations with reactive and proactive aggression were found, except for emotion regulation that was negatively related with both kinds of aggression. Potentially confounding effects of socially desirable answering, verbal intelligence, and recall of vignettes were controlled for.

Adolescent↗