Self-uncertainty,social identity prominence and group identification

Drawing on uncertainty-identity theory (Hogg, 2007) and referring to the concept of social identity complexity, we conducted two experiments to test the hypothesis that people would identify most strongly with their group if they felt both self-uncertain and that their group's identity was prominent relative to other identities, either because it was distinct from other identities or because they had few other identities. Self-uncertainty was primed in both experiments after participants had been primed to consider their group's attributes to overlap with or be distinct from the attributes of other identities of theirs (Experiment 1, N = 90) or to consider few or multiple other identities they had (Experiment 2, N = 87). As predicted, group identification was strongest under high uncertainty and when identity distinctiveness or few other identities had been primed. Implications of this research for how we conceptualize identity complexity are discussed.     

Doing Good at Work Feels Good at Home,but Not Right Away: When and Why Perceived Prosocial Impact Predicts Positive Affect

When and why does the experience of helping others at work spill over into positive affect at home? This paper presents a within‐person examination of the association between perceived prosocial impact at work and positive affect at home, as well as the psychological mechanisms that mediate this relationship. Sixty‐eight firefighters and rescue workers completed electronic diaries twice a day over the course of 1 working week. Random‐coefficient modeling showed that perceived prosocial impact predicted positive affect at bedtime. This relationship was mediated by perceived competence at the end of the working day and positive work reflection during after‐work hours but not by positive affect at the end of the working day. The findings demonstrate that the experience of helping others at work has delayed emotional benefits at home that appear to be channeled through the cognitive mechanisms of perceived competence and reflection rather than through an immediate affective boost.     

Impugning Randomness, Convincingly

John organized a state lottery and his wife won the main prize. You may feel that the event of her winning wasn’t particularly random, but how would you argue that in a fair court of law? Traditional probability theory does not even have the notion of random events. Algorithmic information theory does, but it is not applicable to real-world scenarios like the lottery one. We attempt to rectify that.     

Form and function in religious signaling under pathogen stress

The evolution of religious traditions may be partially explained by out-group avoidance due to pathogen stress. However, many religious rituals may increase rather than decrease performers' susceptibility to infection. Moreover, religions often spread through proselytizing, which requires out-group interaction; and in other cases, the benefits of economic exchange increase religious pluralism and social interactions with out-groups.     

Relationship between chronic stress and carotid intima-media thickness (IMT) in elderly Alzheimer's disease caregivers

The stress associated with providing care for a spouse diagnosed with Alzheimer's disease can have adverse effects on cardiovascular health. One potential explanation is that chronic caregiving stress may contribute to the development of atherosclerosis. The purpose of this study was to determine whether the duration that one has provided care is associated with the degree of atherosclerotic burden, as measured by carotid artery intima-media thickness (IMT). One hundred and ten Alzheimer caregivers [mean age 74?±?8 (SD) years, 69% female] underwent in-home assessment of carotid artery IMT via B-mode ultrasonography. Data regarding medical history, blood pressure, and multiple indicators of caregiving stress were also collected. Multiple regression indicated that duration of care was positively associated with IMT measured in the internal/bifurcation segments of the carotid artery (β?=?0.202, p?=?0.044) independent of risk factors such as age, gender, body mass index, smoking history, sleep quality, hypertension status, and caregiving stressors. Duration of care was positively associated with IMT in the common carotid artery, but the relationship was not significant. These findings provide more evidence of the link between chronic caregiving stress and cardiovascular disease and indicate that enduring the experience of caregiving over a period of years might be associated with atherosclerotic burden.     

Preadaptation to the feeding schedule does not eliminate activity-based anorexia in rats

To test whether activity-based anorexia (ABA) still occurs after preadaptation to the feeding schedule, 20 rats were first exposed to a feeding schedule of one 90-min meal per day until adaptation occurred (measured by maintenance of stable body weight). Then, during ABA training, half the rats (wheel group) were confined in running wheels except during the daily meal, and half (cage group) were not. Wheel running suppressed feeding—that is, food intake in the wheel group was less than that in the cage group. Also, the rats in the wheel group lost weight, whereas those in the cage group did not. Wheel running increased over days. Thus, the defining characteristics of ABA were evident in rats that were not subjected to ABA training until after they had become well adapted to the feeding schedule. These findings support the view that the suppression of feeding produced by wheel running triggers the vicious circle of ABA. They also cast doubt on the hypothesis that activity-induced interference with adaptation to the feeding schedule plays a key role in causing ABA.