Sensitivity to reinforcer duration in a self-control procedure

In a concurrent-chains procedure, pigeons' responses on left and right keys were followed by reinforcers of different durations at different delays following the choice responses. Three pairs of reinforcer delays were arranged in each session, and reinforcer durations were varied over conditions. In Experiment 1 reinforcer delays were unequal, and in Experiment 2 reinforcer delays were equal. In Experiment 1 preference reversal was demonstrated in that an immediate short reinforcer was chosen more frequently than a longer reinforcer delayed 6 s from the choice, whereas the longer reinforcer was chosen more frequently when delays to both reinforcers were lengthened. In both experiments, choice responding was more sensitive to variations in reinforcer duration at overall longer reinforcer delays than at overall shorter reinforcer delays, independently of whether fixed-interval or variable-interval schedules were arranged in the choice phase. We concluded that preference reversal results from a change in sensitivity of choice responding to ratios of reinforcer duration as the delays to both reinforcers are lengthened.     

TEACHING JOB INDEPENDENCE AND FLEXIBILITY TO MENTALLY RETARDED STUDENTS THROUGH THE USE OF A SELF-CONTROL PACKAGE

We examined mentally retarded individuals' use of picture cues and self-monitoring to initiate a series of tasks of varying type and order. Four severely to moderately retarded high school students participating in a vocational training program were trained to use a picture-cue system. The system consisted of photographs of vocational tasks that were inserted in the assigned order in a photoalbum sheet; self-management was accomplished by marking off each photo after its corresponding task was completed. Students were assigned seven tasks from a pool of 13 each day. Results indicated that the students quickly learned to use the picture-cue system to change tasks throughout their workday without trainer prompts and that performance was maintained as trainer feedback and presence were decreased. At the end of the study, two students who were exposed to novel photographs were able to initiate independently after only minimal training, suggesting that the use of the picture-cue system had become a generalized skill.     

The association between team‐level social capital and individual‐level work engagement: Differences between subtypes of social capital and the impact of intra‐team agreement

The study explored the association between team‐level social capital and individual‐level work engagement. Questionnaire data were collected from six companies in the dairy industry. Seven hundred seventy‐two participants divided into 65 teams were included. In confirmatory factor analyses, we found a superior model fit to a four dimensional model of social capital: bonding social capital, bridging social capital and two types of linking social capital. The results showed a positive association between all subtypes of social capital at the team level and work engagement at the individual level. However, this association only remained significant for linking social capital in relation the workplace as a whole when we adjusted for psychosocial working conditions. The level of intra‐team agreement in social capital score did not moderate the association between social capital and work engagement. In conclusion, the results provide further support for previous findings suggesting a positive association between social capital and work engagement. They add to the existing knowledge by suggesting that linking social capital in relation to the workplace is the most important explanatory variable for work engagement, thus emphasizing the need to distinguish between subtypes of social capital in research and practice.     

Ego depletion improves insight

Initial acts of self-control can reduce effort and performance on subsequent tasks – a phenomenon known as ego depletion. Ego depletion is thought to undermine the capacity or willingness to engage executive control, an important determinant of success for many tasks. We examined whether ego depletion improves performance on a task that favours less executive control: insight problem solving. In two experiments, participants completed an ego-depletion manipulation or a non-depleting control condition followed by an insight problem-solving task (i.e., matchstick arithmetic). Participants in the depleting condition demonstrated greater insight problem-solving accuracy than those in the non-depleting control condition. Priming theories of willpower did not impact these results. Although ego depletion is widely regarded as a “state of impairment”, attendant decreases in executive control may foster insightful thinking.     

Understanding supplement use: an application of temporal self-regulation theory

Vitamin and mineral supplement use is increasing worldwide. As evidence of the effects of these practices are equivocal at best, it is important to determine why individuals engage in vitamin and mineral supplement use through the application of a theoretical framework. The aim of this study was to employ temporal self-regulation theory (TST) to establish the determinants of supplement use. A cross-sectional design was used with a sample of 121 individuals who consume vitamins or minerals as dietary supplements. Hierarchical regression analyses were conducted to determine the influence of intention, habit, self-control, and the interaction between intention and habit and self-control on the frequency of supplement use. The model accounted for a significant proportion of variance in behaviour (R² = .44) with intention and habit significantly related to supplement use. Self-control moderated the relationship between intention and behaviour indicating that intention was not related to behaviour when self-control was low. The TST model offers a satisfactory account of supplement use and provides avenues for interventions aimed at increasing safe and beneficial supplement use and decreasing potentially harmful supplement use.     

Natural Disasters in Indonesia: Relationships Among Posttraumatic Stress,Resource Loss,Depression, Social Support,and Posttraumatic Growth

ABSTRACT

Indonesia is at significant risk for catastrophic natural disasters, including earthquakes, volcanic eruptions, and tsunamis. Few studies have examined psychological functioning following disaster exposure in Indonesia, the fourth most populous country in the world. This study assesses variables associated with posttraumatic stress and posttraumatic growth following a devastating earthquake in Central Java that ranks as one of the costliest in Indonesia. The participants were 85 men and women living in rural farming villages. Almost all (95%) experienced major home damage or total home destruction. Posttraumatic stress symptoms were associated with resource loss, depression, and concerns about future earthquakes. Participants reported moderate posttraumatic growth. Posttraumatic growth was associated with energy resource loss and social support. The findings support conservation of resources stress theory. The implications of the findings for intervention and recovery programs are discussed.     

资源多寡对大学生择偶线索偏好的影响

本研究采用分配择偶币的范式考察资源多寡对大学生择偶线索偏好的影响。结果发现：1）择偶资源多寡影响大学生的择偶线索偏好,低资源条件下人们更看重忠贞、健康等“必需品”（necessities）,高资源条件下则会增加对创造力等“奢侈品”（luxuries）的考虑。2）择偶线索偏好存在性别差异,当自身资源较少时,女性比男性更看重长期伴侣的社会经济地位,而男性比女性更看重伴侣的忠贞;当自身具备高资源时,性别差异不显著。本研究发现择偶线索中的“奢侈品”和国外研究结果类似,而“必需品”和国外研究差异较大。研究结果表明,择偶线索偏好可能受到进化和社会文化因素的共同影响。     

Can contesting orientations predict grittier,more self-controlled athletes?

Grit and self-control are highly desired qualities of character in the sport arena. This two-study investigation used a new theoretical approach, contesting theory, to examine whether contesting orientations could predict these characteristics among intercollegiate athletes. Contesting theory identifies two distinct modes of cognitively processing the meaning and purpose of contesting, one rooted in a contest-is-partnership metaphor and the other a contest-is-war metaphor. Study 1 (N = 799) found that contesting orientations added incremental utility beyond demographic and control variables to the prediction of the two dimensions of grit (perseverance and consistency). Specifically, the partnership orientation positively predicted higher grit scores. Study 2 (N = 1179) replicated the findings of Study 1 with only minor variations and also demonstrated that contesting orientations add to the prediction of self-control. Results are discussed in terms of the practical implications for sport practitioners and, more broadly, the value of contesting theory to positive psychology.     

急诊监护病房重症患者的预后和相关因素回顾分析

收集北京大学人民医院急诊监护3年间收治患者资料,并进行一年随访,结果发现随着年龄的增长,ICU病死率逐渐增加,生活不能自理的比例越来越高;而且ICU后病死率也越来越高。深入了解ICU患者的转归和预后情况,有利于我们更有效率地使用重症监护资源。