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PubMed1998

Criterion validity and the utility of reactive and proactive aggression: comparisons to attention deficit hyperactivity disorder, oppositional defiant disorder, conduct disorder, and other measures of functioning.

Examined the criterion validity and the utility of Dodge and Coie's (1987) measure of reactive and proactive aggression. Participants were 405 children in kindergarten through 5th grade attending an urban elementary school. Examined criterion validity by testing whether reactive aggression or proactive aggression was significantly correlated with criterion measures of overall impairment as measured by the Impairment Rating Scale (Pelham, Gnagy, et al., 1996), classroom behavior as measured by a frequency count of classroom rule violations, and peer adjustment as measured by teacher ratings of peer behavior on the Pittsburgh Modified IOWA Conners (Pelham, Milich, Murphy, & Murphy, 1989). Examined utility by testing whether reactive aggression or proactive aggression was significantly correlated with criterion measures after controlling for each other and after controlling for attention deficit hyperactivity disorder, oppositional defiant disorder, and conduct disorder as measured by the Disruptive Behavior Disorder Rating Scales (Pelham, Gnagy, Greenslade, & Milich, 1992). Results showed good evidence of criterion validity for both reactive and proactive aggression, but mixed evidence for their utility.

Aggression↗

PubMed2003

Negative feelings exacerbate hostile attributions of intent in highly aggressive boys.

Tested the hypothesis that aggressive boys' tendency to attribute hostile intentions to peers is exacerbated in a negative emotional state. Twenty-nine highly aggressive boys in special education, 12 moderately aggressive boys in regular education, and 16 nonaggressive boys in regular education inferred peers' intentions in 8 vignettes concerning ambiguous provocation by peers. Mild negative emotions were induced by unjust loss of a manipulated computer game. Half the vignettes were completed in this negative emotional state. After completion of all vignettes, the game was played again and won to reinduce positive feelings. Self-ratings of feelings obtained throughout the study showed the manipulations consecutively induced negative and positive feelings. Negative feelings increased hostile attribution of intent in the highly aggressive group. Highly and moderately aggressive boys responded more aggressively than nonaggressive boys.

Adolescent↗

PubMed2003

Aggressive and nonaggressive boys' physiological and cognitive processes in response to peer provocations.

This study examined physiological and social-cognitive correlates of aggression in an in vivo laboratory provocation situation. Fifty-one male participants (ages 9 to 13) were selected based on teacher aggression screenings, ranging from normative to high levels. A provocation was induced by the experimenter communicating a threat from an unseen "peer" in the laboratory. Bivariate linear regression analyses showed that aggression significantly predicted heart rate at both pre- and postinduction, and aggression significantly predicted attributions of intent following the provocation. Results indicated that aggression was a significant predictor of changes in hostile attribution and heart rate following the threat induction. A positive correlation also was found between heart rate change and attribution change. The findings suggest that both physiological and social-cognitive processes should be addressed in clinical interventions with aggressive children.

Adolescent↗

PubMed2006

A factor analytic approach to distinguish pure and co-occurring dimensions of proactive and reactive aggression.

This study used a confirmatory factor model to distinguish pure and co-occurring dimensions of proactive and reactive aggression, and examined the relation between parenting variables and these dimensions of aggression in a sample of 100 children (9 to 12 years of age; 69 boys). Confirmatory factor analysis (CFA) supported 3 dimensions of proactive and reactive aggression: pure proactive, pure reactive, and their co-occurrence. Parenting variables differentially related to the pure and co-occurring dimensions of aggression. Findings indicate that CFA provides a promising approach for conceptualizing aggression on a continuum and allows researchers to distinguish pure and co-occurring dimensions of proactive and reactive aggression.

Aggression↗

PubMed2001

Suppression of aggression in rainbow trout (Oncorhynchus mykiss) by dietary L-tryptophan.

Juvenile rainbow trout Oncorhynchus mykiss were isolated in individual compartments in observation aquaria and allowed to acclimate for 1 week, during which they were fed commercial trout feed. Thereafter, the fish were tested for aggressive behaviour using a resident/intruder test. Following this first resident/intruder test, the feed was exchanged for an experimental wet feed supplemented with 0.15 % or 1.5 % L-tryptophan (by wet mass). Controls received the same feed but without L-tryptophan supplementation. The fish were fed to satiety daily, and their individual feed intake was recorded. Aggressive behaviour was quantified again after 3 and 7 days of L-tryptophan feeding using the resident/intruder test. Feeding the fish L-tryptophan-supplemented feed for 3 days had no effect on aggressive behaviour, whereas feeding the fish L-tryptophan-supplemented feed for 7 days significantly suppressed aggressive behaviour in the fish, an effect seen at both levels of L-tryptophan supplementation. Fish fed L-tryptophan-supplemented feed showed elevated plasma and brain levels of L-tryptophan. The amino acid L-tryptophan is the precursor of serotonin, and supplementary dietary L-tryptophan was found to elevate levels of 5-hydroxyindoleacetic acid (5-HIAA) and the 5-HIAA/serotonin concentration ratio in the brain. Neither feed intake nor plasma cortisol level was significantly affected by dietary L-tryptophan. Central serotonin is believed to have an inhibitory effect on aggressive behaviour, and it is suggested that the suppressive effect of dietary L-tryptophan on aggressive behaviour is mediated by an elevation of brain serotonergic activity.

Aggression↗

PubMed2006

Frequent aggression and attribution of hostile intent in people with mild to moderate intellectual disabilities: an empirical investigation.

We investigated whether aggressive individuals have an attributional bias of hostile intent compared to nonaggressive peers. We compared 43 frequently aggressive individuals who had mild to moderate intellectual disabilities with 46 nonaggressive controls on an attributional task. The aggressive participants attributed significantly more hostile intent to protagonists and indicated that they would respond more aggressively than did the controls to provocative scenes, but only when the threat was to themselves. Results suggest that differences in attribution of threat to self play a role in frequent aggression. These differences appear to be due, in part, to a positive bias of the nonaggressive participants on the self-referent scenes. Clinically, results highlight the importance of assessing and addressing aggressive individuals' interpersonal perceptions.

Aggression↗

PubMed2002

Why aggression? Metapsychological, clinical and technical considerations.

On the basis of a formalised view of metapsychology, the author briefly considers the problems inherent in the Freudian notion of a death drive or aggressive drive and then goes on to develop a new theoretical conception of aggression. Aggression is understood as an affect, action or affective action and, in relation to these, as an expression of the intensity with which a drive--whether it be the sexual drive with its libidinal cathexes or the self-preservative drive with its lethic cathexes--seeks to attain its object. In this context the author regards the regulation of closeness and distance with respect to the 'psychogeometric locus' of the relevant drive object as being of central importance. She contends that neurotic personalities suffer from specific distortions in the perception of the psychogeometric locus of their drive objects, which may give rise to an intensification of the drive tendencies prevailing in these individuals at any given time so that these tendencies take on an aggressive character. The author presents two clinical vignettes to show how her approach allows aggression and its occurrence to be conceptualised without resorting to the idea of a primary aggressive drive, and draws attention to the resulting technical consequences for interpretation.

Adult↗

PubMed1988

Alcoholics, aggression and antisocial personality.

This study investigated relationships among antisocial personality (ASP) disorder, a childhood history of aggressive behavior and violent behavior in a sample of 77 hospitalized alcoholics. Patients classified according to childhood aggression (high, low) and ASP (present, absent) were compared using self-report measures of anger, aggression, depression, well-being and sociability. Items measuring these variables were rated in terms of the patients' typical behavior while drinking and while sober. Alcoholics reported more anger and aggression when drinking than when sober and this effect was greatest among individuals with a history of childhood aggression. ASP accounted for negligible amounts of the variance when the effects of childhood aggression were considered independently. Results indicate that both alcohol consumption and childhood antecedents contribute to the manifestation of violent behavior by alcoholics.

Adult↗

PubMed1996

Executive cognitive functioning and aggressive behavior in preadolescent boys at high risk for substance abuse/dependence.

OBJECTIVE: This study had three purposes; (1) to assess the underlying factor structure of a battery of neuropsychological tests putatively measuring executive cognitive functioning (ECF) in a sample of boys at high and low risk for substance abuse/dependence; (2) to assess the relationship between ECF and aggressive behavior; and (3) to determine the interactive effects of ECF and a family history (FH) of substance dependence on aggressive behavior. METHOD: Multiple measures of ECF and aggressive behavior were used to test these relationships in a sample of 291 10-12 year old boys with and without a FH of substance dependence. RESULTS: Analyses indicated that the measures of ECF loaded on one factor. ECF was related to aggressive behavior even when accounting for IQ and SES. The interaction between ECF and a FH of substance dependence was also associated with aggressive behavior. CONCLUSIONS: The central finding of this investigation indicates that ECF and its interaction with a FH of substance dependence are associated with aggressive behavior. These results suggest that violence prevention and treatment efforts in high risk groups should incorporate cognitive habilitation focusing on training in ECFs.

Adolescent↗

PubMed1997

Couple communication patterns of maritally aggressive and nonaggressive male alcoholics.

OBJECTIVE: This study was conducted to examine the associations between communication problems and marital violence in couples with a male alcoholic, and to determine whether the communication correlates of marital violence found in nonalcoholic community samples also characterize male alcoholics' relationships. METHOD: Ninety newly abstinent treatment-seeking male alcoholics and their wives completed a 10-minute problem discussion while both partners were sober. Their communication behaviors were coded with the Marital Interaction Coding system. Couples were separated into maritally aggressive (n = 60 couples) and nonaggressive (n = 30 couples) groups on the basis of any husband-to-wife physical aggression in the previous 12 months. RESULTS: The base-rate percentage of aversive-defensive communication was significantly higher for couples with a physically aggressive husband than for couples with a nonaggressive husband. The base-rate percentage of facilitative-enhancing communication did not differ significantly between groups. In sequential analyses, physically aggressive husbands, but not their wives, displayed more negative reciprocity than their nonaggressive counterparts. Alcoholic husbands in general displayed lower rates of facilitative-enhancing communication than did their wives. CONCLUSIONS: Husband-to-wife marital aggression was associated with problematic communication among couples with an alcoholic husband during a sober interaction in a laboratory setting, extending prior nonalcoholic community sample research to male alcoholics' relationships. The maritally aggressive alcoholics were high in negative responses contingent upon their wives' prior negative behavior, and were unlikely to terminate aversive interchanges. Communication problems may be important in understanding and treating co-occurring alcoholism and marital violence.

Adult↗

PubMed2002

Alcohol's direct and indirect effects on men's self-reported sexual aggression likelihood.

OBJECTIVE: This study investigated pathways through which alcohol's direct and indirect expectancy effects and direct physiological effects influenced men's self-reported sexual aggression likelihood after they read a violent pornographic story. The indirect effects of participants' affective responses and cognitive judgments of story characters were also examined. METHOD: Male social drinkers (N = 135), recruited through newspaper ads in a large western city, were randomly assigned to one of three beverage conditions: alcohol, placebo or control. After completing pretest measures, subjects read a violent pornographic story and reported their sexual arousal, affect, cognitive judgments and sexual aggression likelihood. RESULTS: Pre-existing expectancies operated directly and interactively with alcohol consumption on reported sexual aggression likelihood. The influence of expectancies on sexual aggression likelihood also occurred indirectly through positive affect and cognitive judgments of assailant force and victim enjoyment. Situational consumption effects were influenced by cognitive judgments. The expectation of receiving alcohol indirectly affected sexual aggression likelihood through its effect on perception of the assailant's typicality. CONCLUSIONS: Among men who have contact with violent pornography, alcohol can have both direct and indirect effects on reported sexual aggression likelihood. In addition to the presence of situational myopia and expectancy effects, pre-existing expectancies can play a significant role both alone and interactively in affecting this tendency.

Adult↗

PubMed2006

The effect of past-year heavy drinking on alcohol-related aggression.

OBJECTIVE: The primary goal of this study was to determine the moderating effect of a history of heavy episodic drinking on the alcohol-aggression relation in men and women. METHOD: Participants were 310 (152 men and 158 women) healthy social drinkers between 21 and 35 years of age. Drinking history was operationalized as participants' average number of alcoholic drinks consumed per drinking occasion during the past year. Following the consumption of either an alcohol or a placebo beverage, participants were tested on a modified version of the Taylor Aggression Paradigm in which mild electric shocks were received from, and administered to, a fictitious opponent during a competitive task. Aggressive behavior was operationalized as the shock intensities administered to the fictitious opponent under conditions of low and high provocation. RESULTS: Alcohol increased aggression only among highly provoked men who reported a history of heavy episodic drinking. A history of high-frequency drinking did not moderate the alcohol-aggression relation. CONCLUSIONS: These findings highlight the importance of considering a history of heavy episodic drinking in the prediction of intoxicated aggression.

Adult↗

PubMed2006

Music, substance use, and aggression.

OBJECTIVE: This study investigated whether young people's substance use and aggressive behaviors are related to their listening to music containing messages of substance use and violence. METHOD: Using self-administered questionnaires, data were collected from a sample of community-college students, ages 15-25 years (N=1056; 57% female). A structural equation model (maximum likelihood method) was used to simultaneously assess the associations between listening to various genres of music and students' alcohol use, illicit-drug use, and aggressive behaviors. Respondents' age, gender, race/ethnicity, and level of sensation seeking were included in the analyses as control variables. RESULTS: Listening to rap music was significantly and positively associated with alcohol use, problematic alcohol use, illicit-drug use, and aggressive behaviors when all other variables were controlled. In addition, alcohol and illicit-drug use were positively associated with listening to musical genres of techno and reggae. Control variables (e.g., sensation seeking, age, gender and race/ethnicity) were significantly related to substance use and aggressive behaviors. CONCLUSIONS: The findings suggest that young people's substance use and aggressive behaviors may be related to their frequent exposure to music containing references to substance use and violence. Music listening preference, conversely, may reflect some personal predispositions or lifestyle preferences. There is also the possibility that substance use, aggression, and music preference are independent constructs that share common "third factors".

Adolescent↗

PubMed1993

Ethanol-induced enhancement of defensive behavior in different models of murine aggression.

The effects of alcohol on agonistic behavior in mice were studied by introducing an intruder mouse to a resident, alcohol-treated test animal (or saline-injected control). Alcohol (0.1-2.0 g/kg, IP) was administered 20 minutes before testing, and an ethological analysis was made of all behavioral elements shown by the treated animal during a 500-second period. Alcohol did not increase aggression, whether baselines were high, low or experimentally suppressed. Defensive activities, however, were dose-dependently increased, with a threshold dose of 0.5 g/kg or lower in some situations. This suggests that alcohol did not reduce "anxiety" or "fear." Aggression tended to decrease, even with doses as low as 0.5 g/kg, which produced BACs of only 25-40 mg/dl at the start of the testing period. With the highest dose, however, aspects of timidity were still increased after 3 hours, but aggression returned to control level after 1 hour, when the BAC was about 250 mg/dl. In other studies, increased aggression has generally been found only with low alcohol doses. This acute tolerance to the anti-aggressive effect of alcohol reported here suggests the possibility of finding pro-aggressive effects at much higher BACs, perhaps more closely simulating the human situation.

Aggression↗

PubMed1993

The effects of alcohol on free-operant aggressive behavior.

Although strong correlations between alcohol use and the frequency and intensity of social aggression have been observed in many populations, the relationship between these two events remains complex. Aggressive behavior is not always associated with alcohol or drug use, and substantial amounts of alcohol are consumed in social settings without the occurrence of violent or aggressive behavior. The relationship between alcohol and human aggressive behavior has been investigated using a free-operant procedure developed from the experimental tradition of behavioral pharmacology. The reliability of the free-operant procedure is evidenced by the similarity in experimental outcomes across laboratories using similar experimental procedures. Evidence for the validity of the procedure comes from recent studies with populations varying in histories of violent behavior, as well as from similarities in the outcome of studies using different experimental paradigms. Recent studies indicate clearly that both antecedent and consequent variables, such as the schedule of provocation and the response requirement for both aggressive and nonaggressive behavior, as well as the social context in which provocation occurs, influence the relationship between alcohol and aggressive behavior. The implications of the role of contextual factors for social policy regarding violence and alcohol use are discussed.

Adult↗

PubMed2000

Pup age and aggressive behavior in lactating rats.

High levels of aggressive behaviors against intruders in the nest area are displayed by female rats during the first 10 days after delivery, declining thereafter to very low levels, even though lactation continues. Cross-fostering experiments were undertaken to test the hypothesis that pup age may affect aggression in lactating rats. The behavior of females on the 8th day after delivery when raising fostered 8-day-old pups was compared to that of females on the 8th postpartum day raising older pups (18 days old) for the last 5 days, and females on the 18th day after delivery raising fostered 18-day-old pups were compared to females in the same postpartum period nursing younger pups (8 days of age at the time of the maternal aggression test) for 5 days. Pup retrieval activity and plasma prolactin level were also analyzed. Females on the 8th postpartum day nursing 18-day-old pups were less aggressive than females in the same postpartum period, but with 8-day-old pups. Likewise, females on the 18th postpartum day nursing younger pups were more aggressive and presented higher levels of prolactin than females nursing older pups. Thus, pup development can alter the natural decline of maternal aggressive behavior.

Age Factors↗

PubMed2001

Reduction of intraspecific aggression in adult rats by neonatal treatment with a selective serotonin reuptake inhibitor.

Most studies suggest that serotonin exerts an inhibitory control on the aggression process. According to experimental evidence, this amine also influences growth and development of the nervous tissue including serotoninergic neurons. Thus, the possibility exists that increased serotonin availability in young animals facilitates a long-lasting effect on aggressive responses. The present study aimed to investigate the aggressive behavior of adult rats (90-120 days) treated from the 1st to the 19th postnatal day with citalopram (CIT), a selective serotonin reuptake inhibitor (20 mg/kg, s.c., every 3 days). Aggressive behavior was induced by placing a pair of rats (matched by weight) in a box (20 x 20 x 20 cm), and submitting them to a 20-min session of electric footshocks (five 1.6-mA - 2-s current pulses, separated by a 4-min intershock interval). When compared to the control group (rats treated for the same period with equivalent volumes of saline solution), the CIT group presented a 41.4% reduction in the duration of aggressive response. The results indicate that the repeated administration of CIT early in life reduces the aggressive behavior in adulthood and suggest that the increased brain serotoninergic activity could play a role in this effect.

Aggression↗

PubMedDate not supplied

Who is violent?: factors associated with aggressive behaviors in Latin America and Spain.

The main purpose of this paper was to evaluate the strength of the association between: 1) aggressive behaviors and 2) attitudes and self-efficacy for alternatives to violence, in different cities of the Region of the Americas and Spain. Results were based on a cross-sectional house-hold survey of a sample of the population aged 18 to 70 years. The survey was conducted in eight metropolitan areas of Latin America and Spain: Rio de Janeiro, Brazil; Salvador, Bahia, Brazil; Santiago, Chile; Cali, Colombia; San José, Costa Rica; San Salvador, El Salvador; Caracas, Venezuela; and Madrid, Spain. Each sample of approximately 1,200 respondents per city was stratified by clusters and was proportional in terms of socioeconomic position and population density. In all cities and for all targets of aggression studied, people who reported using aggression were less likely to feel confident that they could solve conflicts without violence, and they were more likely to hold attitudes supporting violence. Young persons were also more likely to commit aggression against all the targets. In addition, aggression toward nonfamily members was found most frequently among young men who reported binge drinking, who either carried a firearm or would have liked to carry one, or who perceived the police as inefficient. Additional studies need to be done in each country to describe more specific attitudes associated with aggression within each subculture. Future prevention programs should focus on modifying attitudes that support violence, increasing self-efficacy in solving problems without using violence, supporting the development of a police system that people can trust, regulating firearms and access to alcohol, and raising people's education levels.

Adolescent↗