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PubMed2001

Neurocognitive models of aggression, the antisocial personality disorders, and psychopathy.

This paper considers neurocognitive models of aggression and relates them to explanations of the antisocial personality disorders. Two forms of aggression are distinguished: reactive aggression elicited in response to frustration/threat and goal directed, instrumental aggression. It is argued that different forms of neurocognitive model are necessary to explain the emergence of these different forms of aggression. Impairments in executive emotional systems (the somatic marker system or the social response reversal system) are related to reactive aggression shown by patients with "acquired sociopathy" due to orbitofrontal cortex lesions. Impairment in the capacity to form associations between emotional unconditioned stimuli, particularly distress cues, and conditioned stimuli (the violence inhibition mechanism model) is related to the instrumental aggression shown by persons with developmental psychopathy.

Adult↗
PubMed2002

Human aggression.

Research on human aggression has progressed to a point at which a unifying framework is needed. Major domain-limited theories of aggression include cognitive neoassociation, social learning, social interaction, script, and excitation transfer theories. Using the general aggression model (GAM), this review posits cognition, affect, and arousal to mediate the effects of situational and personological variables on aggression. The review also organizes recent theories of the development and persistence of aggressive personality. Personality is conceptualized as a set of stable knowledge structures that individuals use to interpret events in their social world and to guide their behavior. In addition to organizing what is already known about human aggression, this review, using the GAM framework, also serves the heuristic function of suggesting what research is needed to fill in theoretical gaps and can be used to create and test interventions for reducing aggression.

Affect↗
PubMed1983

Androgens, aggressive behaviour and social relationships in higher mammals.

This paper reviews the relationships between androgen levels, aggressive behaviour and social relationships in ungulates and primates. In these and most other mammalian species, aggressive behaviour is sexually dimorphic with males being generally more aggressive than females. This difference is evident very early in play behaviour. In males, and sometimes also in females, aggressive behaviour varies in relation with reproductive cycles and the hormonal changes which are involved in these cycles. The experimental manipulation of hormonal levels by castration or administration of exogenous hormones gives results that vary according to the species, sex, type of hormone (e.g. aromatizable or non-aromatizable androgens), and other factors (e.g. antlers state in stags). Nevertheless, it has generally been shown that aggressive behaviour in male ungulates depends largely on androgens and that in female ungulates androgen treatment consistently raises social rank, with or without modification in aggressiveness. Primates, on the other hand, seem to be less dependent on androgens for the expression of aggressive behaviour and social status.

Aggression↗
PubMed1989

Psychosis, aggression, and self-destructive behavior in hospitalized adolescents.

The authors studied the history of aggressive and self-destructive behaviors in psychotic and nonpsychotic hospitalized adolescents (N = 137). A multidimensional measure of self- and other-directed aggression was retrospectively applied to each patient's social and developmental history. Nonsignificant gender and diagnostic differences were obtained on ratings of violence and suicide. Broader definitions of internal and external aggression yielded nonsignificant diagnostic differences, but gender differences were observed on both internal and external aggression measures. Females displayed greater internal aggression, and males reported higher external aggression scores. These results, compared to those of other investigators, suggest the importance of social and cultural variables in understanding adolescent psychosis and aggression.

Adolescent↗
PubMed1999

Physical aggression in dementia patients and its relationship to depression.

OBJECTIVE: The goal of this study was to determine the frequency of physically aggressive behavior in community-residing patients with dementia and its relationship to depression. METHOD: A consecutive series of 541 patients with DSM-IV-defined dementia underwent comprehensive neuropsychiatric evaluation and were rated on the Cornell Scale for Depression in Dementia, the Mini-Mental State, the Psychogeriatric Dependency Rating Scale, and the General Medical Health Rating. RESULTS: Physically aggressive behavior was exhibited by 79 patients in the 2 weeks before evaluation. Aggressive behavior was closely associated with moderate to severe depression, male gender, and greater impairment in activities of daily living, even after adjustment for delusions, hallucinations, sleep disturbance, and severity of cognitive impairment. After adjustment for depression, gender, and impairment in activities of daily living, there was no association between physically aggressive behavior and the presence of either delusions or hallucinations. CONCLUSIONS: A substantial minority of patients with dementia exhibit physically aggressive behavior, and this aggression is strongly linked with the presence of depressive symptoms. It is possible that the identification and treatment of depression in dementia may be a means of preventing and managing physically aggressive behavior.

Activities of Daily Living↗
PubMed2000

Neural correlates of imaginal aggressive behavior assessed by positron emission tomography in healthy subjects.

OBJECTIVE: Neurodegenerative or traumatic lesions of the frontal lobes often lead to abnormally aggressive behavior. The authors hypothesized that the imaginal evoking of scenarios involving aggressive behavior would be associated with a modulation of the functional activity in the human frontal cortex. METHOD: Regional cerebral blood flow (rCBF) determinations by positron emission tomography and psychophysiological measures of emotional responsivity were obtained in a group of 15 young healthy volunteers with good visual imagery abilities and no history of abnormal behavior while they imagined the same scenario with four variations involving emotionally neutral behavior and aggressive behavior. RESULTS: Compared to the imagined neutral scenario, the imagined scenarios involving aggressive behavior were associated with significant emotional reactivity and rCBF reductions in the ventromedial prefrontal cortex, suggesting that a functional deactivation of this cortical area occurs when individuals respond to the eliciting of imagined aggressive behavior. CONCLUSIONS: These results in healthy subjects further expand previous findings from animal and human studies by providing an in vivo functional demonstration of the involvement of the orbitofrontal cortex in the expression of aggressive behavior. They are also consistent with the hypothesis that a functional alteration of this cortical region may be present in individuals with pathological aggressive behavior.

Adult↗
PubMed2002

Do testosterone levels relate to aggression in elderly men with dementia?

The aim of this study was to determine if testosterone and estrogen levels correlate with aggression in older men with dementia. Plasma total and free testosterone and estrogen levels and scores for behavioral disturbances, in particular aggression, were measured in 50 elderly males who had a diagnosis of dementia. Aggression was analyzed separately from agitation. Pearson correlations were calculated to determine the association between testosterone and estrogen and aggression. Linear regression analyses determined the influence of hormone levels on aggression, controlling for age, medical burden, and dementia severity. Free testosterone levels showed significant positive correlations with measures of aggression. Estrogen levels showed significant negative correlations with measures of aggression.

Aged↗
PubMed1991

Antecedents and interventions for aggressive behavior of patients at a geropsychiatric state hospital.

Aggressive geropsychiatric patients pose major problems for long-term care facilities. Two exploratory surveys at a geropsychiatric state hospital, separated by brief programs of inservice training on managing aggressive patients, examined several aspects of aggressive behavior and staff interventions. Major findings included a stable overall prevalence of aggressive behavior in both survey periods; a persistently higher prevalence of aggression and a higher rate of physical aggression among dementia patients than among other patients; and staff-patient exchanges as a major triggering event for aggression. In the survey period after the inservice training, staff interventions remained similar for nondementia patients; however, for dementia patients, interpersonal interventions were used less frequently, and p.r.n. medications, alone or in combination with seclusion or restraint, were used more often.

Aged↗
PubMed2000

On the receiving end: facilitating the analysis of conflicted drive derivatives of aggression.

Freud's delay in giving aggression an instinctual role comparable to that of libido had clinical effects. Historically, this delay rescued psychoanalysis and its practitioners from destruction by Austria's anti-Semitic leadership. Since today the cultural threat to analysis is of quite a different nature, methods are proposed for making drive derivatives of aggression (and, in turn, libidinal drive derivatives) more accessible. Certain traditional methods have in significant degree distracted analysts from techniques that more effectively allow patients to bring conflicted derivatives of aggression into nonneurotic management through analytically facilitated ego growth. Approaches that move away from the concept of conflicted instinctual drives compound the basic resistance to analyzing defended drive derivatives of aggression. A recommendation is made for a two-tier choice of method: (1) a traditional technique for patients needing relatively less access to their aggression to achieve a satisfying outcome, and (2) close process attention for the analysis of analytic candidates and others for whom it is professionally advantageous to achieve greater insight into their aggressive potential. Recommendations are made regarding how the analyst can attain the neutrality necessary to conduct analyses of the latter sort without having to suffer narcissistic trauma while on the receiving end of verbally explicit, undisplaced drive derivatives of aggression.

Aggression↗
PubMed1987

The emergence of assertion and aggression during infancy: a psychoanalytic systems approach.

A model is presented in which assertion and aggression are seen as arising from two entirely different biopsychological systems in the human infant. Assertion derives from the universal tendency to be active, to seek stimuli, to generate plans, and to carry them out. It is a self-activating system and is generally associated with the positive affects of joy, interest, and excitement. Aggression derives from the equally universal self-protective system. This system, however, is reactive in the face of a perceived threat and is associated with the dysphoric affects of anger, fear, and distress. During the infant and toddler period, the child's assertions may be treated punitively by the parents as if they were aggressive acts. The child in turn feels threatened and becomes self-protective. The result is a contamination between assertion and aggression and the creation of a new self-sustaining system in which aggression appears to be spontaneous and self-activating. If assertions are frequently blocked, the contamination may be extensive, and it may appear as if an aggressive instinctual process is present. However, a systemic explanation provides a much better fit with the empirical observations than does an instinctual one. Four examples of different family styles are presented. The model permits one to understand the subtle qualitative differences in style reflecting different individual combinations of assertion and aggression and their associated affects.

Affect↗
PubMed1995

The effect of a self-management training package on the transfer of aggression control procedures in the absence of supervision.

An aggression replacement and self-management training package reduced the frequency of aggressive behavior among four junior high adolescents identified as seriously emotionally disturbed (SED). During baseline sessions, the students were covertly filmed as they stood unsupervised in front of the school cafeteria. The four subjects engaged in aggressive behavior during 50% of the filmed intervals. These episodes involved provocation by other students, self-initiated provocation, or continuing interaction between students once an aggressive episode had begun. Treatment procedures included instruction, modeling, and role playing of aggression replacement skills. Self-management training included self-assessment, self-recording, and self-reinforcement. Following an 8-week period, subjects demonstrated substantial improvement in prosocial skills without supervision. During reversal-to-baseline conditions, aggressive behavior increased; however, reinstating treatment conditions brought a return to prosocial behavior. Outcomes suggest that aggressive replacement skills may transfer and sustain more adequately using self-management.

Adolescent↗
PubMed2001

The neuropsychopharmacology of criminality and aggression.

Although the idea that aggression has biological components is not a new one, recent research in genetics, neuropsychopharmacology, and neuroimaging has helped clarify the biological contributions to aggression. Studies to date have focused on serotonergic function and impulsive aggression. Reduced levels of cerebrospinal fluid (CSF) 5-hydroxyindoleacetic acid (5-HIAA) are associated with impulsive aggression. Pharmacochallenge studies have found decreased serotonergic responsiveness associated with impulsive aggression. Neuroimaging studies suggest a role for the prefrontal cortex, along with other regions of the brain, in the expression of aggression. Serotonin is not the only aspect of brain function implicated in impulsive aggression, and further work is being done on other neurotransmitters and neuropeptides.

Aggression↗
PubMed2005

Scale of negative family interactions: a measure of parental and sibling aggression.

This article examines a measure of received emotional, physical, and sexual aggression within the family: the Scale of Negative Family Interactions (SNFI). Unlike traditional familial violence scales that measure parental aggression alone, the SNFI simultaneously measures sibling violence for a more comprehensive examination of familial aggression. Although a variety of scales may be used in researching parental abuse, the SNFI is uniquely intended for (a) examining sibling violence while controlling for parental aggression, (b) examining parental abuse while controlling for sibling violence, and (c) comprehensively examining family violence to include aggression from both parents and siblings. Test-retest and internal consistency reliability were demonstrated, and evidence for validity is presented. In addition to offering a measure of sibling and parental aggression, the SNFI has the advantages of including everyone in the role of parent or sibling and of measuring a wide variety of emotional, physical, and sexual aggression within the family.

Adult↗
PubMed2005

Social, legal, and institutional context of heterosexual aggression by college women.

This review concerns women's heterosexual aggression. Social context considers prevalence and incidence, gender roles and social norms, reactions to receiving aggression, and alcohol and drugs. Legal context focuses on state law and institutional context focuses on college and university codes of conduct. Primary findings: women engage in the full range of sexually aggressive behaviors attributed to men; the language of many legal codes place women's heterosexually aggressive behaviors below the threshold for rape even when it involves physical force or the use of a weapon; many men, similar to many women, do not report receiving sexual aggression and may not define themselves as victims; regardless of reporting status or self-perception, some men do suffer physical and psychological symptoms as a result of receiving sexual aggression from women; and women's heterosexual aggression may be more socially acceptable than men's.

Adult↗
PubMed2003

Aggressive behavior in abused children.

Our objective was to investigate the relationship between a lifetime history of traumatic stress, defined as physical and/or sexual abuse and aggression and psychosocial functioning in a sample of clinically referred and nonclinically referred children and adolescents. This is a retrospective case comparison study. Three groups of children were identified, assessed, matched for age, and partially matched for gender. Children clinically referred to residential treatment with a history of abuse (N = 29) were compared with children clinically referred to residential treatment without a history of abuse (N = 29), and a nonclinical group of children residing in the community (N = 29). Variables investigating specific types of aggression, IQ, and psychopathology were assessed across the three groups. Clinically referred children scored worse on all measures compared with nonclinical community children. Clinically referred abused children scored higher on measures of aggression and significantly higher on measures of reactive aggression and verbal aggression than clinically referred nonabused children. Clinically referred abused children had significantly lower verbal IQ scores than clinically referred nonabused children, but no difference in psychopathology. Results support the importance of assessing specific types of aggression in samples of traumatized youths. Verbal information processing may be especially vulnerable in abused children and adolescents and enhance vulnerability to aggressive responding.

Adolescent↗
PubMed2006

Bioacoustic monitoring of aggression in group-housed rhesus macaques.

Many captive primate facilities house rhesus macaques in multimale-multifemale social groups in large enclosures that simulate the natural social and environmental features characteristic of the species, enhancing their reproductive performance as well as their psychological well-being, yet one of the most difficult management problems in socially housed macaques is their propensity for exhibiting spontaneous bouts of deleterious aggression. To address this management problem, an automated bioacoustic monitoring system might be developed that is capable of detecting and forecasting problematic patterns of contact aggression. To evaluate the utility of this approach, this study examined the magnitude of aggression and the co-occurrence of certain vocalization types and aggression in 10 groups of rhesus macaques. The data confirmed aggression as a significant problem in rhesus groups and indicated that certain patterns of vocalizations are indicative of the type or level of aggression. The detection and classification of these vocalization types need further research to eventually design and implement an efficacious bioacoustic system for monitoring aggression in rhesus macaques.

Aggression↗
PubMed1976

Aggression in children in an urban clinic.

Seeking to identify causal factors and practical means of controlling aggressive behavior, the clinical records of 35 aggressive and 35 non-aggressive boys were examined for evidence of parental and peer models, frustating life experiences, and capacity for fantasy on projective tests. Records of 15 girls were also studied. The most striking difference between groups appeared in the high frequency of aggressive behavior in parents and peers of the aggressive children and the relative absence of such behavioral models for the nonaggressive groups. Support for fantasy and frustation theories was also found. The reduction of aggressive behavior would necessitate going beyond individual treatment and enlisting the cooperation of aggressive families.

Aggression↗
PubMed1999

Hand test AGG and AOS variables: relation with teacher rating of aggressiveness.

The purpose of this study was to determine the extent to which the Hand Test (Wagner, 1983) variables Aggression (AGG) and the Acting Out Score (AOS) were able to differentiate a group of children who were identified as aggressive and referred for psychological assessment by their teachers from a nonreferred, control group. Hand Test scores of 37 children who had consecutive referrals for psychological assessment because of aggressiveness were compared to the Hand Test scores of 37 children, matched on age and sex, from a nonreferred group. Through the use of an analysis of variance, AOS and AGG were found to significantly differentiate between the two groups. Spearman (rho) correlations between AGG and AOS scores with aggressive-referred status were rho = .45, p = .0001, and rho = .32, p = .006, respectively. Also, diagnostic efficiency statistics demonstrated moderate to high overall correct classification rates for AOS > or = 0 and AGG > or = 2 in identifying children in the aggressive-referred group. The results of this study provide support for the validity of the AGG and AOS scores in the assessment of aggressive behavior in children and demonstrate the utility of the Hand Test to identify aggressive tendencies in children.

Adolescent↗