Influence of control of shock on subsequent shock-elicited aggression.

Shocks which cannot be controlled by an organism have been shown to interfere with subsequent escape-avoidance training more than do equivalent shocks which can be controlled. 2 experiments extended the generality of this phenomenon by examining the effects of the escapability of shock on subsequent shock-elicited aggression. Exp. I (with 48 male Sprague-Dawley rats) found that prior exposure to inescapable shock reduced the frequency of shock-induced fighting, while escapable shock did not produce such a reduction. The theory that yoked-control procedures can capitalize on individual differences and produce a systematic difference between groups was ruled out as an explanation of the data of Exp. I by the results of Exp. II, conducted with 22 similar Ss. (19 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Suppression of mouse killing and apomorphine-induced social aggression in rats by local anesthesia of the mystacial vibrissae.

Local anesthesia of the facial epidermis can effect a substantial decrease in shock-elicited fighting of paired rats. The present experiments constitute methodological extensions to mouse killing and spontaneous drug-induced social aggression. In Exp I 28 known mouse-killing male Long-Evans hooded rats were given bilateral lidocaine or placebo injections administered under ether anesthesia. Attack and kill latencies were significantly longer under lidocaine than under placebo; all Ss killed under placebo, whereas a third of all Ss failed to kill on the initial lidocaine test. On subsequent lidocaine testing, latencies decreased and nonkilling Ss killed. In Exp II intense apomorphine-induced conspecific fighting of 48 Ss preselected for aggressiveness was markedly reduced following lidocaine anesthesia. Comparative results of both experiments are interpreted in reference to theoretical assertions regarding the import of sensory information in stimulus-bound attack and the typology of central aggression systems. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Habituation, sensitization, and redirection of aggression and feeding behavior in the three-spined stickleback (Gasterosteus aculeatus L.).

In Exp I, 3-spined stickleback males maintained in individual aquaria built nests and defended the entire aquarium as a territory. Adjacent compartments containing another male, a gravid female, or a nongravid female provided a social context within which to study habituation and sensitization of aggression elicited by a conspecific male intruded into S's territory. Typical sensitization–habituation curves were found for all Ss regardless of kind of neighbor. However, behavior redirected as a result of stimulation of the intruded male differed between conditions. Ss with a male neighbor showed increased aggression toward the neighbor; Ss with a gravid female neighbor showed courtship; and Ss with nongravid female showed neither. A 3rd behavior, nest building, showed no difference between conditions. Exp II elicited the same motor response to the intruded stimulus, but the motivational category was changed by eliciting the behavior by presenting live brine shrimp. Aggression did not change during habituation, but the waning predation was redirected to another food-securing behavior, picking at the substrate. Results provide evidence for the important role that social context plays in understanding the redirection of behaviors, a phenomenon predicted from an extension of the dual-process theory of habituation. (20 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Victim reactions in aggressive erotic films as a factor in violence against women.

Investigated whether the behavioral characteristics of the people in erotic films and the nature of the targets available for aggression afterward can affect subsequent aggression. In Exp I, 80 male undergraduates were angered by a male or female confederate. They were then shown a neutral film or 1 of 3 erotic films. The erotic films differed in terms of their aggressive content (2 were aggressive and 1 was not) and the reactions of the female victim in the 2 aggressive films (positive vs negative). Ss were then allowed to aggress against the confederate via electric shock. Results indicated that films had no effect on male targets, whereas both types of aggressive erotic films increased aggression toward the females. In Exp II with 80 male Ss, the effects of the above films on nonangry viewers were investigated with only female confederates. Results indicate that angered Ss were more aggressive toward the female after viewing either aggressive erotic film but that only the positive-outcome aggressive film increased aggression in nonangered Ss. The theoretical and applied aspects of aggressive and nonaggressive erotica are discussed. (40 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Isolation-induced aggression in newly hatched ducklings.

Describes 3 experiments with a total of 40 Khaki Campbell ducklings. In Exp I newly hatched Ss were initially housed in pairs and subsequently transferred to isolated housing conditions. Ss living with another bird displayed filial behavior and little aggression upon encountering another duckling in a test arena. In contrast, Ss housed in isolation exhibited aggressive pecking in addition to filial behavior when another duckling was subsequently encountered. In Exp II, Ss were housed with an imprinting object (i.e., an object that elicits attachment behavior) but were otherwise isolated from other birds. These Ss displayed little aggression when they were subsequently reunited with a conspecific, indicating that the aggression-precluding effects of social housing are not limited to the particular social stimulus with which the ducklings are housed. In Exp III, Ss were again housed with an imprinting object, but this time the object was behind glass, thereby precluding tactile contact with it. Since these Ss also exhibited little aggression when reunited with a conspecific, it is apparent that visual stimulation from an imprinting object is sufficient in itself to preclude subsequent aggression. Findings suggest that stimulation that elicits attachment behavior is the critical factor mediating isolation-induced aggression. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social position and competition in laboratory rats.

Conducted 2 experiments with male albino rats which controlled for social position (i.e., relative dominance-submission) in an appetitive social learning-performance setting. The 10 most dominant and 10 most submissive of 30 Ss were used in Exp I, and the 20 most dominant of 30 Ss were paired in Exp II. Results indicate that Ss which performed effectively when alone exhibited significantly reduced levels of responding when placed into a social environment. The severity of the response decrement was partly a function of the relative social position of the Ss involved. A dominant male made few responses when paired with another dominant male. Yet, a dominant S made even fewer responses when paired with a submissive S, which barpressed at approximately half the individual level. Findings suggest that social position, with its accompanying characteristic form of aggression, is an important determinant of performance in a social learning environment. (18 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Implicit stereotyping in person judgment.

Three experiments demonstrated implicit gender stereotyping. A target's social category determined the use of previously primed stereotyped information, without Ss' awareness of such influence. After unscrambling sentences describing neutral or stereotyped behaviors about dependence or aggression, Ss evaluated a female or male target. Although ratings of female and male targets did not differ after exposure to neutral primes, Ss exposed to dependence primes rated a female target as more dependent than a male target who performed identical behaviors (Exp 1A). Likewise, Ss rated a male, but not a female, target as more aggressive after exposure to aggression primes compared with neutral primes (Exp 1B). Exp 2 replicated the implicit stereotyping effect and additionally showed no relationship between explicit memory for primes and judgment of target's dependence. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual approach conditioning: Tests of unconditioned stimulus devaluation using hormone manipulations.

Contents of learning that result from CS–unconditioned stimulus/stimuli (UCS) pairings in sexual approach conditioning were explored with male Japanese quail (Coturnix coturnix japonica). Sexual motivation of Ss conditioned to approach an arbitrary stimulus in a Pavlovian sexual conditioning paradigm was reduced by exposing them to a short photoperiod. Decreased sexual motivation resulted in a decline in sexually conditioned approach behavior (Exps 1 and 2). Responding was restored when Ss were returned to a long photoperiod (Exp 1) and when exogenous testosterone was administered (Exp 2). Decreased sexual motivation did not affect food-conditioned approach behavior (Exp 3). These results suggest that sexually conditioned approach behavior is mediated by a representation of the UCS, which is activated by the CS. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of group identity on resource use in a simulated commons dilemma.

Used 172 undergraduates in 3 experiments to assess the effects of making salient either a superordinate (collective) or subordinate (differentiating) group identity in heterogeneous groups. In Exp I, 22 male and 36 female Ss were assigned to either a superordinate-group identity (small community resident behavior vs other areas) or a subordinate-group identity (behavior of young people vs elderly people) condition and were asked to perform a computer task individually; Ss were led to believe they were interacting with 5 other persons (2 real and 3 bogus Ss) in their group in accumulating as many points as possible while making the resource last as long as possible. Bogus feedback about group behavior was given. In Exp II, 29 male and 19 female Ss were told that the bogus Ss were economics majors and were asked to perform as in Exp I. In Exp III, the level of social-group identity for 40 male and 26 female Ss was manipulated by varying the common fate of the group members. Results of all 3 experiments show support for the hypothesis that individual restraint would be most likely when a superordinate group identity was made salient and under conditions in which feedback indicated that the common resource was being depleted. A sex-response difference found in Exp I was not sustained in subsequent experiments. (10 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Stimulus specificity of physiological response to stress and the Type A coronary-prone behavior pattern.

Conducted 2 experiments with male undergraduates to determine the influence of stimulus specificity on differences in physiological response to stress of coronary-prone (Type A) and noncoronary-prone (Type B [Jenkins Activity Survey]) individuals. In Exp I, a RT task was presented to 51 Ss with and without stress relevant to the Type A behavior pattern. The physiological responses of Type A Ss were greater in the relevant stress compared to the neutral task condition, but responses of Type B Ss were similar in the 2 conditions. In Exp II, 25 Type A and Type B Ss performed a stressful task that was not theoretically relevant to the Type A behavior pattern. Physiological response elevations were found for both groups, but as predicted, there were no differences between Type A and Type B Ss. Results support the discriminant validity of the Type A construct and provide additional evidence for the role of physiological response differences as mediators of the behavior-pattern–disease relationship. (25 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Social play soliciting by male and female juvenile rats: Effects of neonatal androgenization and sex of cagemates.

Investigated the behavior of male and female Long-Evans hooded rats during individual exposure to nonplayful juvenile social stimuli in a novel test of play-soliciting behavior in 2 experiments examining hormonal and experiential determinants of sex differences. In Exp I, using 36 female and 18 male Ss, neonatally androgenized females engaged in play soliciting at a level equal to that of male controls and greater than that of nonandrogenized female controls. In Exp II, 52 males and 32 females were reared in unisexual and bisexual groups in order to compare long-term sex-related social experience effects on juvenile play soliciting. Males exposed only to other young males engaged in greater play soliciting than males exposed to both sexes; females, in contrast, were unaffected by sex of cagemates. Within rearing conditions, however, males engaged in greater play soliciting than females. The combined results suggest that perinatal gonadal androgen exposure effects on social play are prepotent and contribute essentially to sex differences in the initiation of social play behavior. (21 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Sexual variables and shock-elicited aggression.

Investigated the relationship between sex and the amount of shock-elicited aggression (SEA) in 4 experiments. Results show that (a) Sprague-Dawley males (n = 48) had higher SEA frequencies than females (n = 48), but this difference was not statistically significant; (b) Long-Evans males (n = 32) exhibited higher SEA frequencies than females (n = 32); (c) sham-operated Sprague-Dawley males (n = 35) showed higher SEA frequencies than castrated males (n = 35) but this difference was diminished by testosterone replacement in the castrated group; and (d) SEA was unrelated to free-field or stabilometer activity measurement (n = 40 male Sprague-Dawley rats). Considerable aggression occurred in all Ss, suggesting that although sexual variables affect SEA, they do not play as important a role as in other kinds of aggression. (28 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ideal traits and terms of address for male and female college professors.

Examined students' perceptions of college professors' ideal traits to ascertain possible influences of sex-role stereotyping (Exp I) and the terms of address students use with their professors in public and private contexts (Exp II). In Exp I, 20 undergraduates compiled a list of 34 ideal traits of professors divided among 5 categories: intellect, professionalism, communication ability, openness, and nurturing. Another 127 Ss were divided into 3 groups, each of which assigned the ideal traits to a male, female, or unspecified-sex professor. Only slight differences in the assignment of openness and nurturing traits to male and female professors were found, and there was no significant difference between male and female Ss who assigned the traits. In Exp II, 72 Ss were asked how they would address each of their professors in private and in public. Few contextual differences were found; however, female professors, especially those in the 26–33 age group, were addressed by first names more often than their male colleagues. Also, female Ss used the familiar terms more often than male Ss. (19 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dominance in intermale encounters and subsequent sexual success in mice.

In Exp I, when previously isolated male CD-1 mice (n?=?26) were paired and given a female, they fought before beginning to mount, and the more aggressive male ejaculated somewhat more frequently. Males housed together (n?=?26) for several days showed little aggression when jointly given a female, but those that were more aggressive in the home cage clearly ejaculated more frequently. In Exp II, with 144 Ss, males were paired for 4 days after a period of isolation. More aggressive males showed more ejaculations when subsequently tested individually with females, but not when pair members conjointly encountered females. In Exp III, 60 males were paired for several weeks before encountering females. In cases in which home cage dominance was constant, the more aggressive males ejaculated more frequently both when tested individually and when tested as pairs. Findings indicate that success in reproductive behavior in mice is contingent on dominance in intermale aggressive encounters. (26 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Contextual conditioning and the control of copulatory behavior by species-specific sign stimuli in male Japanese quail.

Three experiments were conducted to identify species-specific sign stimuli sufficient to elicit copulatory behavior in male Japanese quail and to determine how learning is involved in the control of behavior by these sign stimuli. In Exp 1, sexually experienced Ss were tested for copulatory behavior with a live female quail and with a model consisting of a female quail's head and neck mounted in front of a foam pad. Comparable levels of copulatory behavior were observed in the two tests, indicating that static visual cues provided by a female quail's head and neck are sufficient to elicit copulatory behavior in this species. Exp 2 showed that male birds that previously received numerous opportunities to copulate with a live female quail in the test situation were significantly more likely to copulate with the head?+?neck model than were sexually inexperienced Ss. Exp 3 showed that prior sexual experience with live quail facilitated responding to the head?+?neck model only if the sexual experience was provided in the same place where Ss were later tested with the model. This finding suggests that sexual experience facilitates control of copulatory behavior by species-specific sign stimuli through contextual conditioning. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of repeated testing on sexual behavior of the female rat.

Investigated effects of stimulation during repeated testing, using 24 female Sprague-Dawley rats in which intromission was prevented by a vaginal mask. Ss were ovariectomized and administered 1 mg of estradiol benzoate (EB) daily for 10 days (Exp I) or 5 mg of EB for 2 days (Exp II). Behavioral indices included lordosis quotient (a measure of sexual receptivity) and rejection quotient (a measure of social rejection of the male). Intensity and duration of lordosis gave additional measures. In Exp I hourly testing increased lordosis quotient and duration, especially in Ss receiving EB for 5 days; no effects of daily testing were shown. Exp II compared the behavior of Ss that were either handled hourly and tested hourly with the male rat or only handled hourly to the behavior of Ss that were tested and handled only once. Repeated testing and/or handling facilitated sexual responsiveness, while Ss that received neither treatment were sluggish in their social response to the male rat when they were tested, and were not sexually receptive. (17 ref.) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Dissonance arousal: Physiological evidence.

Two studies examined whether cognitive dissonance is accompanied by physiological arousal. In Exp I, a standard induced-compliance paradigm was replicated and found to produce the expected pattern of attitude change in 30 male undergraduates. In Exp II, physiological recordings were obtained from 30 additional male undergraduates within the same paradigm. Ss who wrote counterattitudinal essays under high-choice conditions displayed significantly more nonspecific skin conductance responses than other Ss, but they did not change their attitudes. Results support dissonance as an arousal process. Results also indicate that the Ss misattributed their arousal to the physiological recording device. Findings are discussed in terms of dissonance theory, misattribution phenomena, and social psychophysiological research methods. (38 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Learned aversions to copulatory behaviors in male rats.

Used LiCl for an aversive effect on copulatory behavior in adult experienced and inexperienced male hooded rats (Exp I) and in inexperienced adult male Holtzman rats (Exp II). When males received an injection of LiCl immediately after an encounter with an estrous female, the vigor of subsequent copulatory responding was initially unaffected. After 5–20 such pairings, however, males displayed an aversion to copulatory behaviors; they ceased to copulate entirely. These aversions persisted when Ss were tested in a novel environment and extinguished after 4 nonreinforced trials. This multiple-trial adaptation of the conditioned taste aversion paradigm provides a new approach to the aversive control of sexual behavior. (15 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of alcohol and expectancies on verbal aggression in men and women.

In Exp I, 48 male and 48 female heavy social-drinking undergraduates were assigned to beverage (vodka [.75 ml/kg] and tonic or only tonic) and beverage-expectancy (alcohol or tonic) conditions. Ss were provoked by a confederate's unfavorable evaluation and allowed to retaliate. In Exp II, Exp I was repeated using 44 males and 45 females and higher doses of ethanol (1.12 and 1.10 ml/kg, respectively, for males and females). In Exp III, an experimenter criticized 62 male drinkers (.9 ml/kg ethanol) who later evaluated the experimenter's job performance on a questionnaire for his employer. Results show that for Ss at higher doses and males at the lower dose, those expecting alcohol were significantly less aggressive and at higher doses felt happier than did Ss expecting only tonic. Actual alcohol consumption increased aggression only for females at the lower doses. It is concluded that alcohol by its pharmacologic action alone does not necessarily increase aggression at either a low or a moderately high dose. It is suggested that many of the reinforcements of alcohol use are due to the drinkers' cognition rather than the pharmacologic action of alcohol itself. (43 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)