Timing the second response in two-response avoidance.

Rats were trained on a free-operant avoidance task requiring two lever presses within R seconds, with the opportunity for each response distinguished by differing stimuli. Response latencies at a variety of response-shock intervals were found to be proportional to the time available for the response. These results are shown to be consonant with a scalar expectancy model of timing behavior.     

Stress and subjective life expectancy: Cross-sectional and longitudinal associations in early adolescence

Using data from a longitudinal study, the present study employed a latent class mover-stayer analytical strategy to examine both the cross-sectional and longitudinal (+33 months) relationship between membership of stress classes, and subjective life expectancy. Participants were from 21 High schools in Scotland and Northern Ireland. Data were collected in the first year of High school (mean age = 12.5 years), and at +33 months (fourth year, or school year 11). Sample 1 consisted of 1171 adolescents (40.82% females, 2.56% unreported) in Northern Ireland. Sample 2 consisted of 1059 adolescents (52.79% females, 1.32% unreported) in Scotland. Adolescents with the lowest levels of stress projected the highest subjective life expectancy scores. Longitudinal analyses were jumbled and not in keeping with cross-sectional results. More research may be needed on the trajectory of subjective life expectancy over time before it can be depended upon as a reliable outcome variable in adolescent development.     

伴侣低头行为的影响及其心理机制

低头行为指的是线下社会互动时个体因使用手机而冷落社交对象的行为。目前关于低头行为研究最多的是伴侣低头行为。文章在剖析伴侣低头行为内涵之外,分析了伴侣低头行为带来的影响,并从期望违背理论、社会交换理论和相互依赖理论三个视角阐释伴侣低头行为发生的理论机制。总体上,基于现有研究我们认为未来可以从深化作用机制和探索跨关系研究（亲密关系—亲子关系）两个方面进行伴侣低头行为对亲密关系的研究。     

Inequalities in Health and Intergenerational Equity

In the popular folklore three-score-years-and-ten is treated as a fair innings for people, and thereby serves as an informal reference point for judgements about distributive justice within a community. But length of life alone is an insufficient basis for such judgements - a person's health-related quality-of-life also needs to be taken into account. If one of the objectives of public policy is to reduce inequalities in lifetime health, it will be demonstrated that this is very likely to require systematic discrimination against the older members of a community. The notion of community solidatity will also be tested, because a decision will need to be made as to whether the same fair innings applies to all members of the community, or whether some are entitled to more than others. The strength of the fair innings principle is that it brings these issues to the fore in a systematic way which should ais their resolition in a practical context.     

Safety Behavior After Extinction Triggers a Return of Threat Expectancy

Safety behavior is involved in the maintenance of anxiety disorders, presumably because it prevents the violation of negative expectancies. Recent research showed that safety behavior is resistant to fear extinction. This fear conditioning study investigated whether safety behavior after fear extinction triggers a return of fear in healthy participants. Participants learned that two stimuli (A and C) were followed by an aversive loud noise (“threat”), and one stimulus (B) was not. Participants then learned to use safety behavior that prevented the loud noise. Next, A and C were no longer followed by the loud noise, which typically led to extinction of threat expectancy. Safety behavior then became available again for C, but not for A and B. All participants used safety behavior on these C trials. In a final test phase, A, B, and C were presented once without the availability to use safety behavior. At each stimulus presentation, participants rated threat expectancy by indicating to what extent they expected that the loud noise would follow. Compared with the last extinction trial, threat expectancy increased for C in the test phase, whereas it did not increase for A and B. Hence, safety behavior after the extinction of classically conditioned fear caused a partial return of fear. The findings suggest that safety behavior may be involved in relapse after exposure-based therapy for anxiety disorders.     

Breaking down a barrier: increasing perceived out‐group knowledge reduces negative expectancies about intergroup interaction

Although intergroup contact is an effective way of reducing prejudice, negative expectancies about interacting with out‐group members often create a barrier to intergroup contact. The current study investigated cognitive appraisals by which negative expectancies may arise. Specifically, we examined whether increasing Anglo Australians' appraisals of their knowledge about Muslims would reduce their negative expectancies about an (ostensible) upcoming interaction with a Muslim Australian. Participants (89 Anglo Australians) completed a test that provided positive feedback either on their knowledge about Muslims or on their general knowledge (control). As predicted, Anglo Australians who received positive feedback on their knowledge about Muslims had a lower threat appraisal and expected to feel less anxious during the intergroup interaction compared with those who were in the control condition. This provides support for the precursory role out‐group knowledge may have as a resource that is appraised upon the prospect of an intergroup interaction.