Identity matching-to-sample with olfactory stimuli in rats

Identity matching-to-sample has been difficult to demonstrate in rats, but most studies have used visual stimuli. There is evidence that rats can acquire complex forms of olfactory stimulus control, and the present study explored the possibility that identity matching might be facilitated in rats if olfactory stimuli were used. Four rats were trained on an identity match-to-sample procedure with odorants mixed in cups of sand as stimuli. Digging in the sample cup produced two comparison cups, and digging in the comparison cup that contained the same scent as the sample was reinforced. When criterion accuracy levels were reached, novel stimuli were added to the baseline training regimen. All 4 rats reached terminal performance of above 90% correct matching with more than 20 different baseline stimuli and matched novel stimulus combinations with above-chance accuracy; 3 of the 4 rats matched novel stimuli at levels significantly above chance. Accurate matching performance was demonstrated both with 2- and 3-comparison procedures. These results suggest that generalized matching-to-sample can be observed in rats when olfactory stimuli are used and, furthermore, that multiple-exemplar training may be important for its emergence.     

Enhanced feminine sexual behavior and infertility in female rats prenatally treated with an antiestrogen

An attempt to elucidate the possible role of prenatal estrogen on the development of feminine sexual behavior and reproductive function was made by treating females with the antiestrogen CI628 prenatally on days 13-19. Control females were prenatally treated with saline or remained untreated. The animals were delivered by caesarian section on day 22 of pregnancy and placed with foster mothers whose newborn pups had been previously removed. Intact peripubertal females in each treatment group were observed for several reproductive measures, including the capacity to become pregnant. Other females were ovariectomized in adulthood and treated with estradiol benzoate (EB) (1, 1.5, 2 or 4 micro g/rat) and 0.5 mg progesterone and tested for receptivity, proceptivity and sexual partner preference. Two weeks after the completion of these tests, the females were injected daily for 7 days with 0.25 mg testosterone and tested for sexual partner preference and mounting behavior. The results obtained showed accelerated vaginal opening, and infertility in the antiestrogen-treated intact females and enhanced receptivity and proceptivity in response to 1 micro g EB in the antiestrogen ovariectomized females. Sexual partner preference and mounting behavior did not differ between groups. These results suggest an involvement of prenatal estrogen on the development of female reproductive function, but not on behavioral differentiation.     

Neuronal substrates of relapse to cocaine-seeking behavior: role of prefrontal cortex

The return to drug seeking, even after prolonged periods of abstinence, is a defining feature of cocaine addiction. The neural circuitry underlying relapse has been identified in neuropharmacological studies of experimental animals, typically rats, and supported in brain imaging studies of human addicts. Although the nucleus accumbens (NAcc), which has long been implicated in goal-directed behavior, plays a critical role in this circuit, the prefrontal cortex (PFC) appears to process the events that directly trigger relapse: exposure to acute stress, cues previously associated with the drug, and the drug itself. In this paper, we review animal models of relapse and what they have revealed about the mechanisms underlying the involvement of the NAcc and PFC in cocaine-seeking behavior. We also present electrophysiological data from PFC illustrating how the hedonic, motor, motivational, and reinforcing effects of cocaine can be analyzed at the neuronal level. Our preliminary findings suggest a role for PFC in processing information related to cocaine seeking but not the hedonic effects of the drug. Further use of this recording technology can help dissect the functions of PFC and other components of the neural circuitry underlying relapse.     

Understanding the positive and negative outcomes of developmental challenges on the social psychology of female executives in top management teams

Drawing on social identity theory, this conceptual article proposes how working in a male-dominated top management team (TMT) leads to changes in the social psychology of female executives over time. Further, it simultaneously incorporates the role of various factors to develop a comprehensive understanding of positive as well as negative change experiences of female executives. Based on thorough review and integration of the relevant literature from the domains of organizational behaviour, gender management, and psychology, key themes have been extracted and a conceptual model has been proposed. It is suggested that female executives are likely to face epistemological shock after becoming a part of male-dominated TMTs; however, proactive interactions and development of their cultural toolkit is expected to polish leadership capabilities and improve leader identity in them. Conversely, challenges in developing their cultural toolkit may lead to experiences of emotional exhaustion and the eventual psychological detachment of female executives from their teams and work environment. Unlike the focus of existing literature on general social and cultural challenges faced by female workers, this research offers a unique theoretical direction regarding the essence of extensive psychological changes and their long-term prospects for females in male-dominated TMTs. Finally, it also offers practical implications for highlighting various ways to encourage proactivity and social support for creating diversity and inclusion-based leadership in organizations.     

Content analysis of infanticide and neonaticide cases in the UK

Twenty cases, 14 infanticides and 6 neonaticides committed between 1989 and 2020 by biological mothers were analysed using Smallest Space Analysis for the presence of themes. Three themes associated with offender motivation were identified: Desperation, Disturbance and Rejection. Desperation theme included variables suggesting the mother committed the crime as a result of distress or perceived necessity. Disturbance suggested the motivation behind the offence to be as a result of the mother's caregiving role being disturbed; and the Rejection theme explained complete maternal rejection of the infant or new-born as the motivation behind the crime. Alongside the themes, three core variables were identified to be common for the crime regardless of motivation: the crime being committed at Home, the victim Female, and the crime being Denied by the mother. The implications of the findings are discussed including the potential for an investigative support tool and developing understandings of neonaticide and infanticide as separate crimes.     

Effects of compounding drug-related stimuli: escalation of heroin self-administration

Previous experiments have demonstrated that presenting independently established discriminative stimuli in compound can substantially increase operant responding maintained by food reinforcement or shock avoidance. Recently, this phenomenon was also shown to occur with cocaine self-administration. The present study further assessed the generality of these stimulus-compounding effects by systematically replicating them with heroin self-administration. Rats' nose-poke responses produced intravenous heroin (0.025 mg/kg per infusion) on a variable-ratio schedule when either a tone or a light was present. In the absence of these stimuli, responding was not reinforced. Once discriminative control by the tone and light had been established, the stimuli were presented in compound under extinction (with heroin discontinued) or maintenance conditions (with heroin available during test-stimulus presentations). In extinction, the tone-light compound increased responding approximately threefold compared to tone or light alone. Under maintenance conditions, compounding increased heroin intake approximately twofold. These effects closely matched those obtained earlier with cocaine. This consistency across pharmacological classes and across drug and nondrug reinforcers further confirms that (a) self-administered drugs support conditioning and learning in a manner similar to that supported by other reinforcers; and (b) multiple drug-related cues interact in lawful and predictable ways to affect drug seeking and consumption.     

Pushing against Gender Barriers

This article presents the case study of Lilija Otīlija Grīviņa's calling to China. Her ministry is one example of how the practice of mission facilitates self-identification, as a person responds to the call of God regardless of their gender. The major sources of the study are archive materials from the Liebenzell Mission and the Latvian Lutheran Church, as well as Grīviņa's newsletters published in Chinas Millionen. To provide theological background for the missionary service of women, the study also looks at the work of German missiologists Gustav Warneck and Theodore Christlieb. The research uses a main historical comparative methodology to uncover the development of thought of women missionaries in the specific historical context.     

Effect of signaled reinforcement on response variability

Three experiments examined the effect of signaling reinforcement on rats' lever pressing on contingencies that reinforced variable responding to extend the exploration of signaled reinforcement to a schedule that has previously not been examined in this respect. In Experiment 1, rats responding on a lag-8 variability schedule with signaled reinforcement displayed greater levels of variability (U values) than rats on the same schedule lacking a reinforcement signal. In Experiment 2, rats responding on a differential reinforcement of least frequent responses schedule also displayed greater operant variability with a signal for reinforcement compared with rats without a reinforcement signal. In Experiment 3, a reinforcement signal decreased the variability of a response sequence when there was no variability requirement. These results offer empirical corroboration that operant variability responds to manipulations in the same manner as do other forms of operant response and that a reinforcement signal facilitates the emission of the required operant.     

Health Outcomes and Attitudes Toward Female Genital Cutting in a Community-Based Sample of West African Immigrant Women from High-Prevalence Countries in New York City

Female genital cutting (FGC), a deeply rooted cultural practice with high prevalence rates in many West African countries, is considered by many to represent systematic gender-based violence and human rights violation. Although short- and long-term health consequences of FGC have been examined in studies in Africa, the experiences of women who have immigrated to the Western countries such as the United States have remained largely unexplored. We sought to examine prevalence rates of FGC, as well as differences in demographic characteristics, health outcomes, and knowledge, attitudes, and beliefs among West African immigrants. This study employed audio computer-assisted self-interviewing with a community-based sample of 68 women from Gambia, Guinea, Mali, and Sierra Leone living in New York City. The rate of FGC was 68% overall and varied significantly by country, tribe or ethnicity, and marital status. Women with FGC had a significantly higher number of live births and were more likely to report a history of vaginal pain and decreased sexual arousal, but there were no other significant differences in gynecological and obstetric outcomes, sexual functioning, or psychological outcomes. Participants also had similar rates of opposition to FGC, although women with FGC were less likely to assert human rights as a reason to end the practice. Women reported a high level of surprise and unpreparedness for the FGC procedure, and 22% reported that it was done without their parents’ consent. Long-term health consequences of FGC among women who have immigrated remain unclear, although resistance to the practice is overwhelming.     

‘Familiar friends’: Catholic mother–daughter narratives

The main theoretical and practical focus of this paper is on the Catholic mother–daughter relationship, and how connections between women shape, and are shaped in, and through this nexus. It is contended that it is imperative that we begin to understand different representations of connections among, and between women, including that of mothers and daughters, as they compose part of the changing yet continual dialect of our (religious) feminine identities. The intent is to embrace the contradictions and polarities, which are apparent in these inter-generational relations. This article is set in middle class suburban Melbourne Australia, and spans the period from the early to late twentieth century. Conversations between an Anglo-Saxon Catholic mother and daughter act as a catalyst to discuss the matrilineal pedagogical dimensions that mark female relations within social and religious discourses.