Effects of transections to the vomeronasal nerves or to the main olfactory bulbs on the initiation and long-term retention of maternal behavior in primiparous rats.

While the onset of maternal behavior at parturition is mediated by hormones, the maintenance of maternal behavior during the first few postpartum weeks depends on experiences acquired while the dam interacts with pups (Rosenblatt, 1990). In fact, if female rats are permitted as little as 2 h or maternal experience within 36 h after Cesarean delivery, they exhibit heightened maternal behavior during maternal induction tests 10 days later; in contrast, dams separated from young at the time of Cesarean delivery and not permitted a maternal experience fail to respond maternally in tests 10 days later (Orpen & Fleming, 1987). In this study we investigated the role of chemosensory input through the vomeronasal and main olfactory systems in this maternal experience effect. Six groups of primiparous females were tested for maternal behavior to foster pups presented 9-10 days after Cesarean delivery: three groups were permitted to interact with pups for a 2-h period 36 h after Cesarean delivery; and three groups were separated from pups until testing and were given no maternal experience. Within each experience condition, one group sustained bilateral section of the vomeronasal nerves, one sustained bilateral coronal cuts through the midsection of the main olfactory bulbs, and one group sustained small medial olfactory bulb cuts. The results showed that animals sustaining vomeronasal or olfactory transections, regardless of experience condition, exhibited significantly reduced latencies to maternal behavior in maternal induction tests. However, these chemosensory disruptions did not prevent an additional facilitation of maternal behavior produced by a prior maternal experience.     

A behavior-based circuit model of how outcome expectations organize learned behavior in larval Drosophila

Drosophila larvae combine a numerically simple brain, a correspondingly moderate behavioral complexity, and the availability of a rich toolbox for transgenic manipulation. This makes them attractive as a study case when trying to achieve a circuit-level understanding of behavior organization. From a series of behavioral experiments, we suggest a circuitry of chemosensory processing, odor-tastant memory trace formation, and the "decision" process to behaviorally express these memory traces--or not. The model incorporates statements about the neuronal organization of innate vs. conditioned chemosensory behavior, and the types of interaction between olfactory and gustatory pathways during the establishment as well as the behavioral expression of odor-tastant memory traces. It in particular suggests that innate olfactory behavior is responsive in nature, whereas conditioned olfactory behavior is captured better when seen as an action in pursuit of its outcome. It incorporates the available neuroanatomical and behavioral data and thus should be useful as scaffold for the ongoing investigations of the chemo-behavioral system in larval Drosophila.     

The forked tongue and edge detection in snakes (Crotalus oreganus): an experimental test

Many stimulus-detection systems are lateralized to allow for simultaneous comparison of paired stimuli. It has been hypothesized that the deeply forked tongue of snakes and some derived lizards functions as a chemical edge detector where cues gathered by each tine are kept separate to provide two points of lateral odor assessment by the central nervous system via vomeronasal input. While following a chemical trail, one time can be on the trail, the other off, and such differential information prompts the snake to turn back to the trail. The authors tested this hypothesis in rattlesnakes within a predatory context by unilaterally severing the vomeronasal nerves. If edge detection is used by snakes during prey trailing, then unilateral denervation should disrupt trailing ability. The authors found no change in the seven separate trailing parameters measured. Therefore, they found no support for the edge detection hypothesis as it applies to prey trailing behavior. Instead, the deeply forked tongue may represent a chemosensory specialization to increase odor-sampling area, with snakes and derived lizards detecting only the concentration of chemical trails.     

Anticipated Regret and Time Perspective: Changing Sexual Risk-taking Behavior

In two studies we test the effects of anticipated affective reactions such as regret on behavioral expectations and behavior. These effects were examined in the context of sexual risk-taking behavior. More specifically, we tested the impact of the anticipated feelings associated with unsafe sex on sexual risk-taking behavior. We assumed a difference between the feelingsabout unsafe sex and the feelings people anticipate to haveafter this behavior. Two studies tested the hypothesis that respondents who are induced to focus on their anticipated, post-behavioral feelings are more likely to report negative feelings such as regret and to adopt safer sexual practices than respondents who are asked to focus on their feelings about the behavior itself. Study 1 shows that anticipated feelings after unsafe sex were more negative than feelings about the behavioral act itself, and that respondents who were asked to consider these anticipated feelings expressed stronger expectations to reduce their risk in future interactions. Thus, asking respondents to take a wider time perspective, and to consider the feelings they would haveafter having had unsafe sex, resulted in ‘safer’ behavioral expectations. Study 2 replicates the findings of Study 1, and also yielded a reliable effect of the time perspective manipulation on actual, self-reported behavior. Respondents who were asked to report on their anticipated feelings after unsafe sex showed less risky behavior in the five months following the experiment than the remaining respondents. Thus, the induced focus on post-behavioral emotions increased the likelihood of preventive behavior. Implications of these findings for behavioral intervention programs are discussed.     

Adaptive warning signals adjusted to driver passenger conversation: Impact of system awareness on behavioral adaptations

The study investigated behavioral adaptation caused by warning signals that adaptively support drivers engaged in a passenger conversation. Novel advanced driver assistance systems (ADAS) could monitor the driver state to provide warnings adjusted to the driver’s current need for support. While first research indicates positive effects of dynamically adjusting ADAS, the overall safety potential of such adaptive systems remains unclear as little is known about adverse behavioral effects. Occasional inappropriate support due to an incorrect prediction of the current driver state might lead to critical situations when drivers are aware of the adaptive nature of the system and thus rely on the expected system behavior. To better understand behavioral adaptation to dynamically adjusting warnings, 46 participants driving on a test track reacted to two types of warnings (auditory, vibrotactile-auditory) while engaging in driver-passenger conversation or not. In a compensating warning strategy, vibrotactile-auditory warnings were displayed during conversations and auditory warnings in situations without conversation. This strategy was compared to a non-compensating warning strategy in which these assignments were reversed. The impact of behavioral adaptation was measured by considering reactions to simulated failures of these strategies. The role of system awareness for behavioral adaptation was investigated by manipulating awareness of these warning strategies across groups. We found that vibrotactile-auditory warnings reduced the detrimental effects of conversation on reaction times. Crucially, adverse behavioral adaptation was observed whenever an expected vibrotactile-auditory warning was replaced by an auditory warning but this effect was restricted to drivers in the awareness group. The results show that adaptive warning signals optimize the effectiveness of warnings during driver-passenger conversation but adverse behavioral adaptation develops when drivers are aware of the underlying warning strategy. This implies that future adaptive systems are less likely to be associated with behavioral adaptation if the adaptive nature of the system remains unnoticeable to the driver. Our findings could be used for developing and optimizing user-centered ADAS.     

Relevance of non-human animal studies to the understanding of human sexuality

There are several reasons for studying sexual behavior in animals other than the human. Prominent among these is probably the use of sexual behavior as a model system for analyzing hormone actions on the brain. In this kind of study, lordosis behavior in the female rat has frequently been used as the behavioral end-point. Recently, the mouse has become a popular subject because of the availability of strains lacking estrogen or progesterone receptors. Animal sexual behavior is also studied for its own sake by biologists, by agricultural scientists and by those interested in the management of wildlife resources. Finally, there are some researchers interested in human sexual behavior who prefer to approach their problems through studies in non-human subjects, as they thereby gain access to techniques of experimentation impossible in human subjects. This is particularly important when the neurobiological basis of sexual behavior is the subject of study. Two striking similarities between humans and other mammals are the hormone dependency of sexual motivation and the fundamentally bisexual organization of the nervous system. In addition, animal studies have revealed how learning with sexual reinforcement can be an important determinant of sexual behavior. The role of learning has been largely ignored in human studies, and this has led to many misconceptions. Paramount among these is the idea that sexual behavior is associated with reproduction.     

Risk Taking for Sexual Versus Monetary Outcomes using the Balloon Analogue Risk Task

The present study examined risk-taking behavior in relation to sexual and monetary outcomes using the Balloon Analogue Risk Task (BART). Adult men (n = 61) completed two modified BART tasks (one with monetary outcomes and one with sexual outcomes) and a battery of self-report measures concerning sexual and nonsexual constructs. Several findings are reported. First, risk-taking behavior concerning sexual outcomes can be evoked and quantified using the modified BART task reported here. Second, risk-taking for money was associated with latent factors associated with criminal behavior, drug use, and gambling. Third, risk taking for sexual outcomes was associated with the latent factors of sexual excitability and criminal behavior. Results suggest that stimulus-specific measures of risk taking are better associated with some outcomes. Study findings are discussed in terms of their relevance to laboratory research on the behavioral processes that underlie risky decision making.

     

Increasing the Salience of Risky Sexual Behavior: Promoting Interest in HIV-Antibody Testing Among Heterosexually Active Young Adults1

The present study examines whether making the risk associated with unsafe sexual behavior more salient would increase interest in HIV testing. The HIV-related beliefs and behaviors reported by a sample of college students were assessed both before and after they had viewed a vulnerability-oriented film about HIV/AIDS. Viewing the film heightened sexually active participants' belief that they might currently be HIV seropositive. Among participants who were currently sexually active, heightened perceptions of risk and concern about sexual behavior predicted intentions to utilize HIV testing services (controlling for initial risk perceptions and behavior). Those who engaged in behaviors related to HIV testing during the 4-week period after the film had expressed stronger HIV intentions and more pronounced feelings of anxiety and concern about prior sexual behavior. These results suggest that risk-enhancing interventions can stimulate interest in HIV testing.     

Presenting problems of sexually abused girls receiving psychiatric services

Twenty-three behaviors among those suggested in the literature to be associated with sexual abuse were studied in 195 girls, ages 2-18 years, who were consecutive admissions to three Midwestern mental health agencies. Results indicated that sexually inappropriate behaviors, sleep disturbance, depressed mood, and delinquent behavior occurred more frequently in young abuse victims than in clinic comparisons. Sexually inappropriate behaviors and running away appeared more often in older sexually abused girls, than they appeared in older clinic comparisons. These comparisons of the presenting problems of sexually abused and nonabused girls suggested there are few behavioral "markers" of sexual abuse in clinical samples and that sexual abuse may not be a unique contributing factor in the ontogeny of childhood psychopathology.     

Heteronormativity,Disgust Sensitivity,and Hostile Attitudes toward Gay Men: Potential Mechanisms to Maintain Social Hierarchies

Within a social hierarchy based on sexual orientation, heteronormative ideology serves as a social force that maintains dominant group members’ status (e.g., heterosexual men). Disgust may be an emotional reaction to gay men’s violation of heteronormativity (i.e., same-sex sexual behavior) and motivate hostile attitudes toward gay men to promote interpersonal and intergroup boundaries. Based on this theoretical framework, we hypothesized that sexual disgust—compared to pathogen or moral disgust—would be most strongly associated with antigay hostility and would statistically mediate its relationship with heteronormativity. Heterosexual men in the United States (n?=?409) completed an online questionnaire assessing heteronormative ideology, disgust sensitivity, and hostile attitudes toward gay men. Results support the hypotheses and suggest that gay men’s sexual behavior is the most likely elicitor of disgust and antigay hostility, as opposed to a perceived pathogen threat or moral transgression. The findings indicate that heteronormative attitudes and sexual disgust are likely contributors to antigay hostility. Thus, intervention efforts should seek to improve tolerance of same-sex sexual behavior among heterosexual men, which may mitigate emotional reactions and hostile attitudes toward gay men.

     

Sociochemosensory and Emotional Functions: Behavioral Evidence for Shared Mechanisms

ABSTRACT— Olfaction and emotion are distinctively different systems. Nevertheless, there are reasons to suspect that they influence each other on the social level. Functionally, olfactory chemosensory communication is used by a wide range of animals to convey individual and group identity, as well as attraction or repulsion. Anatomically, the olfactory brain overlaps with the socioemotional brain, and is believed to have contributed to the evolution of the latter. Little is known about how the functional and anatomical links are manifested in behavior, however. Using human olfaction as a model, we demonstrate that chemosensory recognition of individuals—one of the most ubiquitous forms of social communication—is interconnected with both the cognitive and the visual processing of emotion. Our results provide the first behavioral evidence for mechanisms being shared by a sensory system and emotion.     

The Impact of Childhood Physical Abuse and Age of Sexual Initiation on Women's Maladaptive Posttraumatic Cognitions

Child abuse survivors often exhibit long-standing maladaptive beliefs. Sexual risk-taking could contribute to the maintenance of such beliefs by reinforcing cognitions that originally resulted from child abuse. In this study, 64 community women, most with elevated posttraumatic stress disorder symptoms, completed measures of childhood abuse, sexual risk-taking, and posttraumatic cognitions. Age of first consensual sexual intercourse mediated the relationship between childhood physical abuse and maladaptive posttraumatic cognitions in adulthood. Thus, age of sexual intercourse initiation might play an important role in women's recovery from childhood physical abuse. Clinicians should consider the possible impact of women's sexual history when challenging their cognitions during trauma-based cognitive behavioral therapy. Further, decreasing risky sexual behavior might partially protect against the negative effects of trauma.     

Snake aggregation pheromones: source and chemosensory mediation in western ribbon snakes (Thamnophis proximus)

Aggregation with conspecifics is a robust phenomenon among snakes that is mediated by chemical cues, although the source of such cues is unknown. Adult western ribbon snakes (Thamnophis proximus) discriminated between skin lipid extracts from conspecifics and those from a sympatric heterospecific snake, the corn snake (Elaphe guttata). Additionally, ribbon snakes were attracted to conspecific skin lipid-marked shelters when paired with control-marked shelters, but no preference was exhibited when shelters marked with E. guttata skin lipids were paired with control-marked shelters. Furthermore, prevention of chemical access to the vomeronasal organs of T. proximus eliminated the ability to respond to conspecific skin lipids. These results indicate that epidermal lipids are the source of chemical cues mediating attraction to shelters marked by conspecifics and that such signals are detected by the vomeronasal system.     

Magnitude and determinants of behavioral risk reduction: Longitudinal analysis of a cohort at risk for AIDS

The magnitude and predictors of longitudinal behavioral change are reported in a cohort of homosexual men at risk for AIDS. Self-reports of sexual behavior were obtained at two points in time separated by an interval of approximately six months. These self-reports were used to construct both dichotomous and continuous measures of changes in behavior consistent with reduction in the transmission of the AIDS virus (HIV). Although there was considerable variability in behavior. mean changes were consistently in the desired direction. Avoidance of anonymous sexual partners, monogamy, and modification of receptive anal sex to reduce exposure to semen by condom use or withdrawal prior to ejaculation appeared to be especially important in this cohort. Both multiple linear regression and multiple logistic regression were used to examine the relationship between a model of health behavior and these outcomes. Variables examined included knowledge of AIDS. perceived risk of AIDS. the perceived efficacy of behavior in reducing AIDS risk, difficulties with sexual impulse control, belief in biomedical technology to provide a prevention or cure, social norms supportive of behavioral change, and gay network affiliation. Of all these factors, only the availability of supportive peer norms was consistently, significantly and positively related to multiple measures of outcome. Differences between these analyses and longitudinal analyses reported elsewhere are discussed. These results suggest the policies regarding HIV antibody testing should be developed cautiously. taking account of the failure of a sense of risk to predict subsequent behavioral change. They also emphasize the important role of gay organizations in developing social norms supportive of behavioral risk reduction.     

Androgens and aggressive behavior in primates: A review

This review deals with possible central and peripheral effects of androgens upon primate aggressive behavior. One problem that clouds interpretation of experimental work is that measurements of dominance have often been employed, such as competition tests for food and water. Such measures often do not correlate with those obtained by quantifying aggressive interactions. It should be remembered that very few of the 188 primate species have been studied experimentally and that great behavioral and physiological diversity occurs within the order. Therefore, generalizations about the effects of androgens upon aggressive behavior in primates (including man) should be made with caution. Testosterone has an organizing influence upon the foetal brain of rhesus monkeys and may affect the development of neural mechanisms which govern aggression in males. More data are required on primates, however, since rhesus monkeys show some important differences from rodents as regards the effects of androgen upon sexual differentiation of the hypothalamus. In future, marmosets may provide a suitable model for such studies, because there is evidence that sexual differentiation of brain by androgen occurs postnatally in these monkeys. At puberty, male primates show a variety of behavioral changes and, during adulthood, males of seasonally breeding species may be more aggressive during the mating season, when testosterone levels are maximal. This does not indicate a causative relationship between testosterone and aggressive responses, because castration and androgen treatments have little effect upon aggression in prepubertal or adult males of several primate species. Androgens have pronounced effects on sexual responses in adult male monkeys, but their central effects upon aggression are much less important than among rodents. Elec trical stimulation of hypothalamic pathways has been employed to evoke aggressive behavior in marmosets and rhesus monkeys. In the rhesus, preliminary evidence indicates that such pathways show some sensitivity to androgens. In rodents it is known that these areas are richly supplied with monoaminergic neurons, which play an important role in aggressive behavior. There is little evidence on primates, however, and this remains a crucial topic for future research. Peripheral effects of androgens should also be considered. Many prosimians and New World monkeys use scent-marking behaviors and, in males, androgen-dependent chemical cues may be involved in sexual recognition and territorial behavior. This possibility awaits investigation. Finally, plasma testosterone levels may alter as a function of aggression itself; thus levels decrease if male rhesus monkeys are defeated by conspecifics. This might occur because neural events associated with giving (or receiving) aggression also influence pituitary function and hence alter gonadal testosterone secretion. Theoretically, it is possible that such changes in circulating testosterone might affect aggressive behavior via a feedback action on the brain, but the experimental evidence does not support such a view.     

Formulation of a behavior system for sexual conditioning

Empirical and conceptual developments that led to the formulation of a behavior system for the sexual conditioning of male Japanese quail are described. Initial efforts concentrated on conditioning with localized conditioned stimuli and on identifying behavioral indices of conditioning. Later, learning about species-typical cues and about contextual cues was also explored, and it became evident that different types of cues control different aspects of sexual behavior. The results were used to formulate a behavior system containing both response and stimulus dimensions. In this system, contextual cues and local cues are assumed to elicit only general search behavior unconditionally. In contrast, unconditioned responses to species-typical cues of a female quail include general search, focal search, and copulatory behavior. General search, focal search, and copulatory behavior can become conditioned to local cues. Conditioning can also modify focal search behavior elicited by species-typical cues and can result in various modulatory influences between different types of stimuli. The behavior system approach provides a framework for organizing the diverse sexual conditioning effects and suggests future directions for investigation.     

Physical, emotional, and behavioral reactions to breaking up: the roles of gender, age, emotional involvement, and attachment style

Associations between gender, age, emotional involvement, and attachment style and reactions to romantic relationship dissolution were studied in a survey of more than 5,000 Internet respondents. It was hypothesized that individual reactions to breakups would be congruent with characteristic attachment behaviors and affect-regulation strategies generally associated with attachment style. Attachment-related anxiety was associated with greater preoccupation with the lost partner, greater perseveration over the loss, more extreme physical and emotional distress, exaggerated attempts to reestablish the relationship, partner-related sexual motivation, angry and vengeful behavior, interference with exploratory activities, dysfunctional coping strategies, and disordered resolution. Attachment-related avoidance was weakly and negatively associated with most distress/proximity-seeking reactions to breakups and strongly and positively associated with avoidant and self-reliant coping strategies. Security (low scores on the anxiety and avoidance dimensions) was associated with social coping strategies (e.g., using friends and family as "safe havens"). Attachment insecurity, particularly anxiety, was associated with using drugs and alcohol to cope with loss.     

The role of risk perception and efficacy cognitions in the prediction of HIV-related preventive behavior and condom use

Abstract

Based on empirical findings on the central model variables of the Protection Motivation Theory, the influence of perceived susceptibility, perceived severity of the threat of AIDS, communicative and sexual self-efficacy, and outcome expectancy on various aspects of HIV-preventive behavior was examined. The study was based on a sample of 468 heterosexual adults between the ages of 20 and 45 years. The data were obtained by means of questionnaires filled out at various vacation sites that draw mass tourism or in the subjects' home town. The most significant predictor of behavior was found to be self-efficacy expectancy as regards assertiveness and use of HIV-related preventive measures. A high communicative self-efficacy expectancy, on the other hand, is associated with a higher level of risk behavior among certain subgroups and under certain behavioral aspects. This confirms the necessity of acknowledging the different forms of self-efficacy expectancy in sexual interactions. Perceived personal threat is also associated with risk behavior with respect to certain behavioral operationalizations. From this it can be concluded that one's own behavior is used as the basis for appraising one's susceptibility. The results also show that distinctions must be made when analyzing HIV-related risk behavior. In particular, a difference must be made between absolute behavior (degree of the risk behavior) and relative behavior (change - especially reduction - in risk behavior due to the danger of AIDS).