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At least 1,063 records · Page 59Linked to original sources
PubMed1996

The effect of social experience on serotonergic modulation of the escape circuit of crayfish.

The neuromodulator serotonin has widespread effects in the nervous systems of many animals, often influencing aggression and dominance status. In crayfish, the effect of serotonin on the neural circuit for tailflip escape behavior was found to depend on the animal's social experience. Serotonin reversibly enhanced the response to sensory stimuli of the lateral giant (LG) tailflip command neuron in socially dominant crayfish, reversibly inhibited it in subordinate animals, and persistently enhanced it in socially isolated crayfish. Serotonin receptor agonists had opposing effects: A vertebrate serotonin type 1 receptor agonist inhibited the LG neurons in dominant and subordinate crayfish and had no effect in isolates, whereas a vertebrate serotonin type 2 receptor agonist enhanced the LG neurons' responses in all three types of crayfish. The LG neurons appear to have at least two populations of serotonin receptors that differ in efficacy in dominant, subordinate, and socially isolate crayfish.

Animals↗
PubMed1980

The effects of juvenile social interaction on growth rate, size and age at maturity, and adult social behavior in Girardinus metallicus Poey (Pisces: Poeciliidae).

The aim of the following experiments is to identify and to describe those factors most probably important in determining reproductive success in male Girardinus metallicus and to investigate how competition among juveniles affects these characters. The quantitative relationships among male size, male aggressiveness, and male sexual activity are examined. Small male are either more aggressive or less affected by aggression than large male, and they tend to exhibit higher sexual vigor. Male which are subordinate to other individuals as juveniles mature later at a larger size and tend to be less sexually active than male dominant as juveniles. Juvenile male are more aggressive than juvenile females. The results are discussed in terms of the ecology of the species, and interspecific comparisons are made.

Aggression↗
PubMed2005

[Stalking: unwelcome company. The psychopathology of a modern phenomenon].

The term stalking describes a pattern of behavior in which the victim is pursued, pestered and threatened. In many cases, the stalker resorts to physical violence, and may even commit murder. In the German-speaking areas, the phenomenon is to date not much discussed in the psychiatric and psychological literature, despite the fact that it is a widespread occurrence. While stalkers are diagnosed as suffering from schizophrenia and/or narcissistic as well as borderline disorders, victims have no typical "victim personality". They do, however, respond to stalking with anxiety, depression and post-traumatic stress disorders, which need to be recognized and treated.

Adult↗
PubMed2006

Essential role of BDNF in the mesolimbic dopamine pathway in social defeat stress.

Mice experiencing repeated aggression develop a long-lasting aversion to social contact, which can be normalized by chronic, but not acute, administration of antidepressant. Using viral-mediated, mesolimbic dopamine pathway-specific knockdown of brain-derived neurotrophic factor (BDNF), we showed that BDNF is required for the development of this experience-dependent social aversion. Gene profiling in the nucleus accumbens indicates that local knockdown of BDNF obliterates most of the effects of repeated aggression on gene expression within this circuit, with similar effects being produced by chronic treatment with antidepressant. These results establish an essential role for BDNF in mediating long-term neural and behavioral plasticity in response to aversive social experiences.

Aggression↗
PubMed2005

Single exposure to social defeat increases corticotropin-releasing factor and glucocorticoid receptor mRNA expression in rat hippocampus.

Stressful life events are able to induce long-term modifications in physiological and neuroendocrine parameters that are related to the onset of several psychiatric disorders. To gain information on molecular modifications involved in long-term changes triggered by stress, we evaluated gene expression in the hippocampus of rats exposed to a single social defeat session. In the social defeat model, the experimental animal is defeated by a dominant male. The defeat induced an increase in body temperature, in distress vocalisations, in serum corticosterone levels and in anxiety-related behaviour measured with an open field test applied 6 h after the exposure to the dominant rat. In the open field test, anxiety-related behaviours were not detectable anymore 30 h after the exposure to the dominant rat and mRNA levels were evaluated at this time-point. The mRNA levels of genes modulated by stress (corticotropin-releasing factor; corticotropin-releasing factor receptor 1; corticotropin-releasing factor binding protein; mineralocorticoid and glucocorticoid receptors; Ca2+/calmodulin-dependent protein kinase-like kinase; Krox20; Bcl-2) and control genes (glyceraldehyde-3-phosphate dehydrogenase; beta-actin and cyclophilin A) were measured with real-time reverse transcription polymerase chain reaction. Corticotropin-releasing factor and glucocorticoid receptor mRNA levels were significantly modulated by the stress procedure, both genes showing an increase in rats exposed to a social defeat. No expression level differences were detected for the other genes. In conclusion, we report that 30 h after an acute social stress, a modification in mRNA levels can be detected in rat hippocampus, thus suggesting potential candidate genes involved in mediating long-term responses.

Animals↗
PubMed2004

Opposing hormonal mechanisms of aggression revealed through short-lived testosterone manipulations and multiple winning experiences.

Territorial aggression is influenced by many social and environmental factors. Since aggression is a costly behavior, individuals should account for multiple factors such as population density or reproductive status before engaging in aggression. Previous work has shown that male California mice (Peromyscus californicus) respond to winning aggressive encounters by initiating aggression more quickly in future encounters, and we investigated the physiological basis for this effect. We found that injections that produced a transient increase in testosterone (T) following an aggressive encounter caused males to behave more aggressively in an encounter the following day. Experience alone was not enough to change aggression, as males treated with saline injections showed no change in aggression. The effect of T injections on aggression was androgen-based, as the inhibition of aromatase did not block the T injections from increasing aggression. Aromatase inhibition did, however, increase aggression in the initial aggression tests (before application of T or saline injections), and aromatase activity in the bed nucleus of the stria terminalis (BNST) was negatively correlated with aggression. A previous study suggested that aromatase activity in the BNST decreases after males become fathers. Thus, distinct neuroendocrine mechanisms allow male California mice to adjust aggressive behavior in response to changes in social and reproductive status.

Aggression↗
PubMed1986

What makes male mice paternal?

Both copulation and postcopulatory cohabitation with pregnant females reduce infanticide and enhance paternal responsiveness in male CS1 mice. The effectiveness of copulation in this process, however, depends on the number of occasions that males have previously encountered infants. Infanticidal males which have been subordinated in brief encounters with other males are less likely to commit infanticide in subsequent tests than are those which became dominant to other males. Males which copulate and cohabit with a relatively large female are less likely to be infanticidal than are those with a relatively small female. These data suggest that males are subordinated after copulation by their mates and that this subordination is a factor in the reduction of infanticide and the initiation of paternal responsiveness.

Aggression↗
PubMed2000

Chronic psychosocial stress reduces the density of dopamine transporters.

The effect of different types of physical stress on brain dopaminergic function has been well established in rodents; however, the role of the dopaminergic system in more naturalistic stress situations is poorly understood. Therefore, the aim of the current study was to investigate the effect of chronic psychosocial stress on the dopamine transporter, which is an important component in the regulation of dopaminergic neurotransmission. For this purpose, we used the well-characterized paradigm of subordination stress in male tree shrews (Tupaia belangeri). In the present study, the animals were subjected to psychosocial stress for 28 days. Animals were daily videotaped and locomotor activity was quantified. In subordinate animals, urinary cortisol and noradrenaline, as well as adrenal weight, were increased, whereas body weight, locomotor activity and testicular function were decreased. Brain dopamine transporter binding sites were quantified by in vitro autoradiography using [3H] WIN 35,428 as ligand. Chronic stress reduced the number of binding sites (Bmax) in the caudate nucleus and the putamen without affecting the affinity (Kd). Stress did not influence the binding parameters in the nucleus accumbens, the substantia nigra or the ventral tegmental area. Furthermore, we found a positive correlation between locomotor activity and the Bmax values for [3H] WIN 35,428 binding in the caudate nucleus, the putamen and the nucleus accumbens. The present study shows that a naturalistic stressor, such as chronic psychosocial conflict, decreases dopamine transporter binding sites in motor-related brain areas, suggesting that the reduction in locomotor activity in subordinate tree shrews is related to the downregulation of dopamine transporter binding sites.

Animals↗
PubMed1991

Perceptions of submissiveness: implications for victimization.

Some researchers have suggested that a precondition of affective submissiveness may increase the likelihood of female victimization in sexual assault, whereas others have suggested that criminal offenders use perceptions of vulnerability when selecting a victim. In this study, based on American college students, men (decoders) rated videotaped women (encoders) dominant versus submissive using a semantic differential instrument. Cue evaluators analyzed the body language and appearance of the videotaped women using a Likert instrument. The results suggest that (a) men form differentiated perceptions of dominant versus submissive women, (b) such perceptions substantially rely on nonverbal cues, (c) dominant and submissive women display visually different behaviors and appearances, and (d) men tend to select submissive females for exploitation.

Criminal Psychology↗
PubMed2003

Taking a stand: using psychoanalysis to explore the positioning of subjects in discourse.

This paper is concerned with thinking through the cultural construction of personal identities whilst avoiding the classical social-individual division. Our starting point is the notion that there is no such thing as 'the individual', standing outside the social; however, there is an arena of personal subjectivity, even though this does not exist other than as already inscribed in the sociocultural domain. Our argument is that there are psychoanalytic concepts which can be helpful in exploring this 'inscription' and thus in explaining the trajectory of individual subjects; that is, their specific positioning in discourse. The argument is illustrated by data from a qualitative study of young masculinities, exploring the ways in which some individual boys take up positions in various degrees of opposition to the dominant ideology of 'hegemonic' masculinity.

Adolescent↗
PubMed2005

Full disclosure: telling patients when not being a research subject is a good choice.

Informed consent to participation in research generally requires giving a person information about the alternatives to being in the research study. It is quite common, however, for research subjects not to be given one particularly significant piece of information: the possibility of obtaining the "new" treatment being studied directly from a doctor without participating in the study. Since many people enroll in studies precisely to get such a new treatment, they frequently would prefer that option--which guarantees them that new treatment--to enrolling in a study where there is only a 50% chance of getting the new treatment. This issue becomes more complicated in the context of pediatric oncology research, since physician-researchers in this field have entered into a unique informal agreement not to offer such new treatments outside of research studies. That agreement, which in effect forces physicians to behave in a manner that subordinates the well-being of some of their current patients to that of future patients, is ethically and legally questionable.

Choice Behavior↗
PubMed1994

Abusive behavior in the workplace: a preliminary investigation.

Dealing with hostile interpersonal relationships at work has been the topic of many popular books and workshops. Yet, with the exception of sexual harassment, there is surprisingly little mention in the organizational research literature on the nature, extent, and costs of abusive work interactions. These more frequent, more tolerated, and, thus, more damaging interpersonal interactions involve hostile verbal and nonverbal nonphysical behaviors directed by one or more persons towards another. The primary aim is to undermine the other to ensure compliance. In this study, we examined the extent to which students experienced nonsexual nonphysical abusive behavior on their jobs, the impact of this experience on job satisfaction, the characteristics of the actor and target, and responses to these behaviors, particularly turnover. The results indicate that although most of the students had very positive interactions at work, exposure to abusive behavior was familiar, was relatively frequent, and had a negative impact on the targets. The actors tended to be bosses and older than the targets. The quality of the interpersonal relationships at work was related to job satisfaction and intention to leave. The implications of these results are discussed with respect to individual, situational, and organizational factors that may be related to the presence and impact of abusive interpersonal interactions. Avenues for research on the nature, extent, and impact of these behaviors at both the individual and organizational levels are identified.

Adaptation, Psychological↗
PubMed1976

Effects of interactions with older males on behavior and reproductive development in first-year male red-winged blackbirds Agelaius phoeniceus.

Male red-winged blackbirds Agelaius phoeniceus in their first year normally do not establish territories or breed. To investigate the possibility that interactions with older males might inhibit reproductive development of young males, we compared the behavior of first-year males in the presence and absence of older males. For three months during the first half of the breeding season, we studied mixed- and single-age groups of three males in standardized outdoor aviaries: two groups of three first-year males (FFF groups), two groups of one older and two first-year males (AFF groups), and one group of three older males (AAA group). In all groups one male established clear dominance, invariably the older male in AFF groups. The dominant male in FFF groups displaced subordinates less frequently than did the dominant older male in AFF groups early in the season, but equally frequently later. In May the largest testies weights of males in FFF groups were significantly lower than those of dominant older males in AFF groups. First-year males in the absence of direct interactions with older males can achieve levels of aggressive behavior comparable to those of a dominant older male in similar social environments but the seasonal development of their aggressive behavior occurs later and their testes in May are smaller than dominant adults'. This delay in the seasonal development of aggressive behavior in first-year males, independent of the immediate social environment, suggests that the age-dependent territoriality of males in this species is not strongly regulated by effects of older males on the development of younger males.

Age Factors↗
PubMed1990

Endocrine and behavioral responses to aggression and social dominance in the green anole lizard, Anolis carolinensis.

Adult males of the small arboreal iguanid lizard, Anolis carolinensis, will fight and form social dominance hierarchies when placed in habitats with limited resources. The relationships between time since initial aggressive interaction, relative social dominance, reproductive activity, and corticosterone and androgen levels were determined for 34 pairs of lizards. A discriminant analysis established a "dominance index" which indicated that over 90% of the difference between individuals who had won or lost aggressive interactions (putative social dominants and subordinates) was attributable to a single discriminant function reflecting altered body color, perch site selection, and circulating androgen. Animals that had darker body color also selected lower perch sites and had depressed rates of courtship relative to winners of fights and were thus designated as social subordinates. These animals also had levels of circulating androgen significantly lower than that of dominants, but circulating corticosterone was not significantly affected. Winners of fights showed a dramatic surge in circulating androgen at 1 hr but returned to near control values by 1 week; losers, however, showed depressed circulating androgen levels at 1 week.

Aggression↗
PubMed1988

Effects of water deprivation on urine marking and aggression in male house mice.

This study assessed the effects of water deprivation on male mouse urine marking and aggressive behaviors and endurance. In Experiment 1, the size of marks and frequency of marking were examined in 3 groups given 3 different weights of potato/day as their source of water. Males receiving the least water, 1.5 g potato/day, marked at significantly lower rates than males receiving 3 g potato/day or 6 g potato/day (p less than 0.01). The size of urine marks of males was judged by a panel to be unaffected by water deprivation. In Experiment 2, water-deprived males were not as aggressive as normal males and when paired with them were almost always subordinated. Experiment 3 tested the hypothesis that water-deprived males lost fights simply because they were weaker than normal males. When water-deprived and normal males were tested to determine the maximum length of time they could swim, no differences were found (p greater than 0.05). We conclude that water deprivation can directly affect the urine marking and aggressive behaviors of male mice. Such changes may be of adaptive importance during times of drought.

Aggression↗
PubMed1985

Subordination in male talapoin monkeys lowers sexual behaviour in the absence of dominants.

Three experiments assessed the consequences of social status for the socio-sexual behaviour and endocrine state of adult male talapoin monkeys (Miopithecus talapoin). In the first study, each of five males was individually placed into a group of adult females. Neither behavioural responses, nor plasma levels of testosterone, cortisol, or prolactin, predicted males' rank or hormone levels when all males were subsequently placed with these females. In the second study, each of four mixed-sex social groups lived continuously in a large cage for periods ranging from 9-15 months. There were marked differences between the behaviour and hormone levels of highest- and lowest-ranking males. In the third study, each highest- and lowest-ranking male from these groups was individually placed with females. Males that had experienced social subordination for long periods (9-15 months) showed infrequent sexual behaviour and had elevated levels of cortisol and prolactin. These results indicate that the experience of chronic social subordination is a strong predictor of how males will subsequently behave, since both the endocrine and behavioural effects of subordination persist even after the dominant males are removed.

Aggression↗
PubMed1992

Research in a hierarchy of values.

Research fraud has unfortunately become increasingly troubling and public, undermining public confidence and support of research and threatening the foundation of research. The response of the scientific establishment has varied, but the public perception of the response is that it has been too little and too late. Science, like other institutions supported by public funds, must be accountable to the public and must accept public scrutiny without an overly defensive posture. Cooperation with such public review ultimately benefits science. The root problems underlying fraud in research are not unique to science, but reflect individual and societal moral weaknesses. Science and research, although essential and critical societal activities, do not represent the highest priorities of society, and must be subordinate to higher moral and ethical standards whose sources are external to science itself.

Bioethics↗
PubMed1978

Adolescents' attempted influence on parental behaviors.

This study was designed to determine the extent to which adolescents attempt to influence the everyday behaviors of their parents. Questionnaires given to 84 adolescents (mean age 17.6 years) and their parents asked the respondents to indicate which of 31 parental behaviors the adolescent had attempted to influence and whether or not this influence resulted in parental behavior change. Results indicate that total attempted influence correlated significantly and positively with adolescent need for autonomy and significantly but negatively with father's need for dominance. Adolescents perceived attempted influence on more behaviors than did parents, and more influence attempts were reported directed toward mothers than fathers. Differences between the types of parental behaviors that attracted adolescent influence and those that did not are discussed.

Activities of Daily Living↗