A comparison of the aversive and female attractant properties of urine from dominant and subordinate male mice.
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Adrenal Glands↗
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[Catecholamine levels and tyrosine hydroxylase activity in the brain structures of male mice with a determined behavioral type in a population].
Biosynthetic activity in brain catecholaminergic neurons was studied in male mice with genetically determined dominant (PT strain) and subordinate (CBA) behaviour. The dominant PT mice were characterized by higher levels of catecholamines and tyrosine hydroxylase activity in most of the brain regions in comparison with subordinate CBA mice. Percent of animals with dominant type of behaviour was high among the hybrid F1 males derived from PT and CBA mice. These offsprings inherited also the high levels of noradrenaline and dopamine as well as the high tyrosine hydroxylase activity in the striatum and the brain stem. The obtained data suggest that the level of biosynthetic activity in the brain catecholaminergic neurons is essential for coordination of the brain neurochemical systems in expression of the dominant male mice behaviour in a population.
Animals↗
Semantic bias, homograph comprehension, and event-related potentials in schizophrenia.
OBJECTIVES: It is controversial whether a semantic processing bias for strong associates is present in schizophrenia, and unknown whether the language abnormalities observed in schizophrenia can be attributed to dysfunctions early or late in cognitive processing. Combined behavioral and event-related potential (ERP) data can indicate the nature and timing of such abnormalities. METHODS: Sensibility judgements of dominant and subordinate homograph sentences were measured in 12 schizophrenia patients and 13 normal controls. ERPs were recorded to the disambiguating sentence-ending word. RESULTS: All subjects showed greatest misinterpretation of subordinate homograph sentences, but schizophrenia patients particularly misinterpreted these sentence types. For control subjects, subordinate homograph sentences that were classified as nonsensical showed greater N400 than those classified as sensible. By contrast, the N400 of patients was large, regardless of the sensibility judgement--patients' brains initially responded to all subordinate sentences as if nonsensical. These data are consonant with a semantic bias. However, the patients' N400 to dominant homograph sentence endings was also larger than that of controls, a finding not consonant with a semantic bias. CONCLUSIONS: The behavioral results indicate a selective comprehension abnormality in schizophrenia dependent on the content of verbal memory. The ERP results suggest a pervasive contextual memory failure. A semantic activation decay model is proposed to explain these results.
Cognition↗
Heterogeneous growth in the Nile tilapia: social stress and carbohydrate metabolism.
Increase in heterogeneous growth as a result of grouping in the Nile tilapia, Oreochromis niloticus (L.), is presumed to be partially promoted by the social stress imposed by the dominant fish on the subordinates. Such stress may decrease the energy available for growth. In this study, the effect of social stress on carbohydrate metabolism was studied in adult, growing males. All animals were deprived of food during the experimentation period and pairing was imposed for either 2 or 4 days. Glycemia was measured before and after pairing, and muscle and liver glycogen contents were determined only after pairing. Subordinate fish showed the highest consumption of carbohydrate reserves. This response was caused by the social stress imposed which corroborates the idea that metabolic differences promoted by social stress may be involved in the rouping effect on heterogeneous growth in the Nile tilapia.
Agonistic Behavior↗
[The development of pathological forms of behavior in submissive male C57BL/6J mice during agonistic zoosocial interactions. A possible model of depression?].
It is shown that a long experience of defeats in daily zoosocial collisions (ZC) elicits changes in the structure of submissive behaviour. Male mice of C57BL/6J line after 20 defeats demonstrated poses of passive subordination instead of active defence and run away which they manifested in the first ZC. Moreover, new immobile poses appeared which were rare in the first ZC. Submissive animals (CA) demonstrated a decrease of travels in the open field test and an increase of immobility time in the Porsolt test. Chronic administration of imipramine (10 mg/kg, i.p., twice a day during two weeks against the background of repeated ZC) prevented an increase of depressivity, estimated in Porsolt test. Changes were noted in the content of serotonin and 5-HIAA in some brain structures of subordinated mice in comparison to control animals (five days of isolation). The data are discussed from a position of the development of depression in SA of C57BL/6J line as a result of a long nonavoided zoosocial stress.
Aggression↗
Toward a normative definition of medical professionalism.
In recent years, professionalism in medicine has gained increasing attention. Many have called for a return to medical professionalism as a way to respond to the corporate transformation of the U.S. health care system. Yet there is no common understanding of what is meant by the word professionalism. To encourage dialog and to arrive eventually at some consensus, one needs a normative definition. The author proposes such a definition and asserts that the concept of medical professionalism must be grounded both in the nature of a profession and in the nature of physicians' work. Attributes of medical professionalism reflect societal expectations as they relate to physicians' responsibilities, not only to individual patients but to wider communities as well. The author identifies nine behaviors that constitute medical professionalism and that physicians must exhibit if they are to meet their obligations to their patients, their communities, and their profession. (For example, "Physicians subordinate their own interests to the interests of others.") He argues that physicians must fully comprehend what medical professionalism entails. Serious negative consequences will ensue if physicians cease to exemplify the behaviors that constitute medical professionalism and hence abrogate their responsibilities both to their patients and to their chosen calling.
Clinical Competence↗
Assessment of danger to themselves and their infants by rhesus macaque (Macaca mulatta) mothers.
This study investigated whether rhesus macaque (Macaca mulatta) mothers distinguish between what is dangerous to themselves and what is dangerous to their infants. The behavioral interactions between 11 mother-infant pairs and other females living in their group were analyzed in the 1st 2 months of infant life. Mothers behaved as if they perceived higher ranking females as dangerous to both themselves and their infants, lower ranking females as dangerous to their infants but not to themselves, and their young daughters as relatively harmless to both themselves and their infants. Changes in maternal intolerance of infant handling between the 1st and 2nd months covaried with changes in the probability of infant harassment rather than with the temporal pattern of aggression received by mothers. The possible cognitive mechanisms underlying parental recognition of infant's special needs are discussed in the light of comparative evidence from other mammalian species.
Aggression↗
Forebrain arginine vasotocin correlates of alternative mating strategies in cricket frogs.
In cricket frogs, Acris crepitans, sexually active males can switch between calling and noncalling (satellite) mating strategies and injections of the neuropeptide arginine vasotocin (AVT) stimulate calling behavior. We report here that this behavioral variation of animals under field conditions is associated with variations in AVT-immunoreactive (AVT-ir) staining in distinct brain nuclei. In both calling and satellite males, one AVT-ir brain region was found in a continuous string of cells between the medial amygdala and the nucleus accumbens (ACC). Satellite males possessed significantly more AVT-ir staining in the brain (cells and fibers) than calling males at the level of the ACC, although not in the medial amygdala. This difference in AVT-ir staining in the ACC can, in part, be explained by differences in the density of staining within the cells and in cell size. In addition, satellite males had significantly higher AVT-ir staining in the fibers medial to the ACC than calling males. Because other studies have demonstrated that AVT stimulates calling behavior, a plausible hypothesis is that calling males are releasing more AVT from neurons in the ACC, depleting reserves within the cells, and that the released AVT elicits calling behavior. AVT immunoreactivity levels are also higher in the ACC in both calling and satellite males than in female cricket frogs, which do not call. Satellite males may therefore have AVT reserves that might allow them to call depending on the social conditions.
Animals↗
[The characteristics of the intragroup behavior of rhesus macaques and hamadryas baboons during the realization of food motivation in a competitive situation].
The aim of the present work is to consider the specific interrelations in "family" units of macaques (Macaca mulatta) and baboons (Papio hamadryas) during food-getting reactions in competitive conditions. Detailed analysis of dyadic interactions revealed that competing partners demonstrate more various types of behaviour tactics at the initial stage of learning. At the final one, only males of both investigated species performed instrumental reactions and received the food reward. All females demonstrated much more vocal reactions in comparison with males. Thus the variety of competing interactions between heterosexual partners, learning and possibility to realize its motivation correspond ro novelty of experimental situation and degree of intraspecies social subordination.
Animals↗
Prison homosexuality and its effect on post-prison sexual behavior.
Although there has grown up to a considerable literature on sex experiences in prison, little has been written on the post-prison behavioral patterns of those who, voluntarily or involuntarily, become initiated into homosexuality while incarcerated. In the light of the considerable number of prisoners and ex-prisoners in the original Kinsey sample, it is possible that the Institute for Sex Research might have in its files material that would shed light on this problem. To date, nothing has been forthcoming. In one of the few references to the subject, Kirkham (1972, p. 42) suggests that sexual experiences in prison may have permanent effects on the lives of some of the participants: "Can such men return to conventional heterosexual lives after release, or has the experience of being forced into acts of passive homosexuality been so traumatic as to preclude the resumption of sexual relations with members of the opposite sex?" In a search for an answer to his question, the present paper studies ex-prisoners whose initiation into homosexuality occurred during prison.
Age Factors↗
Annual reproductive strategy of the squirrel monkey (Saimiri sciureus).
The physiological and behavioral factors underlying the annual reproductive cycle of the squirrel monkey were evaluated under controlled laboratory conditions. Mating activity following the formation of two social groups served to synchronize the reproductive phases during the subsequent year of observation. Changes in male and female reproductive status were assessed during four designated phases: breeding, pregnancy, lactation and fatting. Behavioral and somatic changes in gonadectomized subjects, living in the social groups, were also evaluated. The variations in behavior and physiology across the year were considered in terms of factors constraining the timing of the natural reproductive pattern.
Animals↗
Climate as a moderator of the relationship between leader-member exchange and content specific citizenship: safety climate as an exemplar.
The present study integrates role theory, social exchange, organizational citizenship, and climate research to suggest that employees will reciprocate implied obligations of leadership-based social exchange (e.g., leader-member exchange [LMX]) by expanding their role and behaving in ways consistent with contextual behavioral expectations (e.g., work group climate). Using safety climate as an exemplar, the authors found that the relationship between LMX and subordinate safety citizenship role definitions was moderated by safety climate. In summary, high-quality LMX relationships resulted in expanded safety citizenship role definitions when there was a positive safety climate and there was no such expansion under less positive safety climates. The authors also found that safety citizenship role definitions were significantly related to safety citizenship behavior. Implications for both social exchange theory and safety research are discussed.
Adult↗
Altered anxiety-related and social behaviors in the Fmr1 knockout mouse model of fragile X syndrome.
The loss of fragile X mental retardation (FMR1) gene function causes fragile X syndrome (FXS), a common mental retardation syndrome. Anxiety and abnormal social behaviors are prominent features of FXS in humans. To better understand the role of FMR1 in these behaviors, we analyzed anxiety-related and social behaviors in Fmr1 knockout (KO) mice. In the mirrored chamber test, Fmr1 KO mice showed greater aversion to the central mirrored chamber than wild-type (WT) littermates, suggesting increased anxiety-like responses to reflected images of mice. Fmr1 KO mice exhibited abnormal social interactions in a tube test of social dominance, winning fewer matches than WT littermates. In a partition test, Fmr1 KO mice had normal levels of social interest and social recognition. However, during direct interaction tests, Fmr1 KO mice showed significant increases in sniffing behaviors. We further tested the influence of environmental familiarity on the social responses of Fmr1 KO mice to unfamiliar partners. In unfamiliar partitioned cages, Fmr1 KO mice did not differ from WT mice in investigation of unfamiliar partners. However, in familiar partitioned cages, Fmr1 KO mice showed less investigation of a newly introduced partner during the first 5 min and more investigation during the last 5 min of a 20-min partition test, behaviors consistent with initial social anxiety followed by enhanced social investigation. Our findings indicate that the loss of Fmr1 gene function results in altered anxiety and social behavior in mice and demonstrate that the Fmr1 KO mouse is a relevant animal model for the abnormal social responses seen in FXS.
Animals↗
Heightened aggressive behavior by animals interacting with alcohol-treated conspecifics: studies with mice, rats and squirrel monkeys.
Drug-free mice, rats and squirrel monkeys showed more aggression toward alcohol-treated conspecifics than under control conditions. Quantitative ethological analysis was used to assess the dose-dependent effects of ethyl alcohol on a range of aggressive, submissive, defensive, escape responses as well as on non-agonistic behavior such as associative responses, grooming, and locomotor activities. Two experimental situations were studied: resident-intruder confrontations in mice and rats, and interactions between members of established groups of squirrel monkeys. After PO administration of ethyl alcohol to intruder mice and rats, the non-drugged resident mice and rats attacked, threatened, and pursued intruders at higher frequencies during 5-min encounters. Similarly, subordinate squirrel monkeys who were members of three established groups, when given alcohol, were grasped, displaced, and displayed to more frequently by non-drugged group members than after water control injections during the first 40 min after injection. This change in aggressive behavior by non-drugged animals was related to the alcohol dose given to the intruder or subordinate animal; near-ataxic alcohol doses (3.0 g/kg in mice, 1.7 g/kg in rats, 1.0 g/kg in squirrel monkeys) altered the behavior of animals whose prevalent pattern is defensive and submissive so that they were the subject of most frequent and intense aggression.
Aggression↗
Exploring the use and effectiveness of behavior style analysis tools in the medical practice.
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Dominance-Subordination↗
Modifying aggressive behavior in the older dog.
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Aggression↗
The effect of recent life events stress, life assets, and temperament pattern on cardiovascular risk factors for Akron City police officers.
Police officers, as a group, experience many occupational demands with physiological and psychological effects that could be harmful to their health. A primary objective of this study was to analyze specific behavioral and physiological risk factors that could lead to hypertension and accelerated coronary artery disease. Three hundred thirty-one male Akron City police officers participated in the study. A group of volunteer males (n = 48) who worked in city clerical jobs were used as controls. Questionnaires were administered in order to measure such behavioral variables as recent life change, life assets, and temperament pattern. Blood chemistry and physiological variables were also measured. The police officers had higher diastolic blood pressure (DBP), norepinephrine (NE) levels, and recent life change unit (LCU) scores than the control group. Increased hostility and depression scores were associated with higher DBP and recent LCU scores and lower life asset unit (LAU) scores. Individuals with higher "dominant" scores and moderate to high recent LCU scores had higher cardiovascular risk factors than those with moderate to high recent LCU scores who were ranked as "subordinate." Rotating shift workers had abnormally elevated NE levels, which, if not controlled, may lead to higher cardiovascular risk. Behavioral intervention programs have been introduced with the goals of reducing stress, increasing life assets, and teaching relaxation techniques.
Adult↗
Arrested development of secondary sexual adornments in subordinate adult male mandrills (Mandrillus sphinx).
Previous studies of semifree-ranging mandrills identified two morphological and social variants of the adult male, based on behavioral and secondary sexual characteristics. "Fatted" males are social, with highly developed sex skin coloration, large testes, high plasma testosterone levels, and fat rumps; while "nonfatted" males are peripheral or solitary, with paler sex skin, smaller testes, lower plasma testosterone, and slimmer rumps. We present a detailed study of morphology and group association for 10 adult male mandrills, living in two semifree-ranging groups in Gabon, in order to relate differences between males to dominance rank. The results show that rather than existing as two distinct morphotypes, male mandrills represent a continuous spectrum of possibilities between social males with fully developed secondary sexual characteristics, and solitary males with muted secondary sexual characteristics. Alpha males (N = 2) had the highest testosterone levels, the most colorful sex skin, and the most active sternal glands, and were the only males to spend 100% of their time with the social group. Rank relationships between nonalpha males (N = 8) were not always clear, but all subordinate males had lower testosterone levels and less development of the secondary sexual adornments, and were less group-associated than alpha males. These findings suggest that only alpha males have sufficient testosterone to develop full secondary sexual characteristics, and we propose possible socioendocrine mechanisms underlying the suppression of testosterone and secondary sexual development in subordinate adults. We discuss differences in secondary sexual development in relation to reproductive strategies, and discuss the evolution of alternative reproductive morphs in primates.
Animals↗