The Effects of Selective Cholinergic Basal Forebrain Lesions and Aging upon Expectancy in the Rat

The effects of selective cholinergic cell loss within the basal forebrain (BF) were determined using a task that requires shifting of attention between two visual stimuli. Discriminability between two stimuli and response bias were determined in young and old F-344 rats given BF injections of IgG-192 saporin (100 ng). The lesion reduced ChAT activity in the frontal and parietal cortices, hippocampus, and olfactory bulbs. The lesion did not significantly alter Na⁺/K⁺-ATPase activity in cortex, hippocampus, or olfactory bulbs, or endogenous levels of neuropeptide Y and neurokinin B within the BF. The BF lesions impaired both stimulus discriminability and response bias in young and old rats. The BF lesions had a significantly greater effect upon stimulus discriminability and response bias in aged rats, compared to young rats, only when the stimulus duration was very brief, i.e., when the task was most difficult to solve. At longer stimulus durations, aging and lesions showed no interaction. The results suggest that the selective loss of cholinergic cells in the BF, but not normal aging, impairs the ability to discriminate between independent sensory stimuli. The loss of these cells confers a response bias in simple operant tasks involving motor responses to reward-related visual stimuli.     

Two Types of Competitiveness: Their Impact on the Perceived Interpersonal Attractiveness of Women and Men1

Previous research by Riskind and Wilson (1982) found that competitiveness in men was associated with perceptions of enhanced interpersonal attractiveness. This research used a single, global definition of competitiveness. The present study extended this earlier research by using two types of competitiveness, goal and interpersonal competitiveness, and by examining the perceived interpersonal attractiveness of competitive women as well as men. It was found that these two types of competitiveness generally have opposite effects. Goal competitiveness, in which one desires to attain a goal and to do one's best, was primarily perceived as enhancing interpersonal attractiveness. By contrast, interpersonal competitiveness, in which one desires to do better than others and to win over other people, showed fewer effects, but was primarily perceived as detracting from interpersonal attractiveness.     

Trauma and substance use: the role of defences and religious engagement

Substance use disorders commonly co-occur with posttraumatic stress disorder and are associated with greater impairment. There is some evidence to suggest that different coping strategies, including defence mechanisms and religious forms of coping, may buffer the relationship between trauma and SUDs. The purpose of this study was to evaluate the potential moderating roles of defence mechanisms and religious coping on the already-established relationship between trauma symptoms and substance abuse. Data were gathered from a sample of college students (N?=?380). Trauma symptoms were associated with increased substance use and abuse. The use of immature defences was significantly associated with trauma and substance use. Increased substance abuse was also associated with higher rates of negative religious coping. Individuals who endorsed trauma symptoms were also more likely to use positive and negative religious coping. Defences and coping did not moderate the relationship between trauma and substance use.     

Self-presentations of happiness: sincere, polite, or cautious?

Two studies addressed the meaning of expressed happiness in social relationships. In the first study, men expected to interact with a socially desirable or a socially undesirable woman. It was predicted that (a) when about to meet a socially undesirable woman, men would display more happiness publicly than is felt privately and (b) when about to meet a socially desirable woman, men would display less happiness publicly than felt privately. Results supported the former and tended to support the latter prediction. In the second study, the authors predicted that women would mistrust men's expressions of happiness upon meeting them such that (a) unattractive women would suspect men of inflating happiness and (b) attractive women would suspect men of suppressing happiness. Results supported the former but not the latter hypothesis. Taking relationship-specific goals into account appears to be important in determining whether emotion will be accurately conveyed and can be trusted.     

Capacities, context and moral status of animals

According to a widely shared intuition, normal adult humans require greater moral concern than normal, adult animals in at least some circumstances. Even the most steadfast defenders of animals' moral status attempt to accommodate this intuition, often by holding that humans' higher-level capacities (intellect, linguistic ability, and so on) give rise to a greater number of interests, and thus the likelihood of greater satisfaction, thereby making their lives more valuable. However, the moves from capacities to interests, and from interests to the likelihood of satisfaction, have up to now gone unexamined and undefended. I argue that context plays a morally significant role both in the formation of an individual's capacities, and in the determination of the individual's interests and potential for satisfaction based on those capacities. Claims about an individual's capacities and interests are typically presented as unconditional; but on closer examination, they are revealed to be contingent on tacit assumptions about context. Until we develop an understanding of how to account for the role of context within our moral theories, attempts to defend special moral concern for human beings based on their superior capacities are less firmly grounded than is commonly thought.     

A closer look at preschoolers' freely produced labels for facial expressions

Children's performance on free labeling of prototypical facial expressions of basic emotions is modest and improves only gradually. In 3 data sets (N = 80, ages 4 or 5 years; N = 160, ages 2 to 5 years; N = 80, ages 3 to 4 years), errors remained even when method factors (poor stimuli, unavailability of an appropriate label, or the difficulty of a production task) were controlled. Children's use of emotion labels increased with age in a systematic order: Happy, angry, and sad emerged early and in that order, were more accessible, and were applied broadly (overgeneralized) but systematically. Scared, surprised, and disgusted emerged later and often in that order, were less accessible, and were applied narrowly.