The coupling of short sleep duration and high sleep need predicts riskier decision making

Abstract

Objective: To examine how risk-related decision making might be associated with habitual sleep variables, including sleep variability, sleep duration and perceived sleep need in young adults cross-sectionally and longitudinally.

Design: 166 participants completed a 7-day protocol with sleep and risk-related decision-making measures at baseline (T1) and 12 months later (T2).

Results: Habitual short sleep duration (averaging < 6?h nightly) was identified in 11.0% in our sample. After controlling for baseline demographic factors and risk-taking measures, self-reported sleep need at T1 interacted with habitual short sleep in predicting risk taking at follow-up (F_8,139=9.575, adjusted R²=.431, p<.001). T1 greater perceived sleep need predicted more risk taking among short sleepers, but decreased risk taking among normal sleepers at T2. Variable sleep timing was cross-sectionally correlated with making more Risky choices at baseline and fewer Safe choices after loss at follow up.

Conclusions: Young adults with variable sleep timing and those with short sleep duration coupled with high perceived sleep need were more likely to take risks. The moderating effects of perceived sleep need suggest that individual differences may alter the impact of sleep loss and hence should be measured and accounted for in future studies.     

Quantifying the Value of Emotions Using a Willingness to Pay Approach

People generally seek out positive moods and avoid negative moods; however, it is unclear which motivation is more pronounced. Two studies addressed this issue by developing a value-based ranking of emotions based on the willingness to pay (WTP) approach. The approach utilizes money’s cardinal properties and assumes opportunity costs as with everyday purchases. In Study 1 British participants indicated they would be willing to pay more to experience positive than to avoid negative emotions. In Study 2 this positivity bias was replicated with another sample of British participants. However, Hong Kong Chinese participants did not show such a preference, and were willing to pay significantly less to experience positive emotions but more to avoid negative emotions when compared with British participants. Experiencing Love was given the highest WTP judgment in all samples. Thus, some emotions are universally valued, whereas preferences for others differ across cultural groups, perhaps shaped by norms. Implications concerning valuations of psychological states for policy purposes are discussed.     

Teasdale's differential activation hypothesis: implications for mechanisms of depressive relapse and suicidal behaviour

Teasdale's differential activation hypothesis (DAH) has been proposed as one account of cognitive vulnerability to depression. This view holds that important factors determining whether one's initial depression becomes more severe or persistent are the degree of activation, and content, of negative thinking patterns that become accessible in the depressed state. This phenomenon has been referred to as cognitive reactivity. Empirical support for the predictions of this model derives from a combination of cross-sectional and prospective studies. In this article, we evaluate this evidence with the goal of determining whether mood-induced cognitive reactivity can be considered a risk factor for depressive relapse/recurrence. Our review demonstrates sufficient evidence to consider cognitive reactivity as a potential causal risk factor for depressive relapse/recurrence. Furthermore, we extend the application of this model to the problem of suicidal relapse/recurrence including a review of preliminary support for this approach.     

Perceived body size affected by garment and body mass index

This study investigated the effect of garment size on perceived body size. The perceived body sizes of nine Chinese men, with Body Mass Index between 17.0 and 37.1 kg/m(2), wearing five sizes of white T-shirts were assessed using Thompson and Gray's Nine-figural Scale. Garment sizes on perceived body sizes were different for those of different Body Mass Index. A backpropagation neural net model was used to model the nonlinear relationship between the perceived body size and the body's BMI, body chest girth, and garment ease (difference between garment and body chest girth). When the BMI was less than 20, wearing larger-sized T-shirts tended to increase perceived body size. For large chest sizes and for taller persons (BMI of 20 to 28) large garments made the wearer look thinner. However, for small persons (BMI of 20 to 28) effect of garment size was relatively small. Obese persons (BMI of > 28), wearing garments too tight or too loose were perceived as larger. Minimum perceived body size was found for garment ease of 2 to 3 cm.     

Persistence of inaccurate beliefs about the self: perseverance effects in the classroom

The perseverance of erroneous self-assessments was examined among high school students. Subjects were first exposed to either highly effective or thoroughly useless filmed instruction, leading, respectively, to their consequent success or failure. No-discounting subjects received no assistance in recognizing the relative superiority or inferiority of their instruction. Discounting subjects, by contrast, were subsequently shown the opposite instructional film, highlighting the obvious differences in instructional quality. Subsequent measures revealed that all subjects recognized the effectiveness or ineffectiveness of their instruction, although this contrast was clearer for discounting subjects. Nevertheless, both discounting and no-discounting subjects continued to draw unwarranted inferences--in line with their initial outcomes--about their personal capacities, immediately afterward. Dissociated and disguised measures of academic preferences and perceptions completed weeks later produced even more dramatic results: The continuing impact of initial outcomes was generally greater for discounting than no-discounting subjects.     

Examining and reexamining the structure of Chinese-English bilingual memory

The asymmetry model of bilingual memory proposed by Kroll and Stewart assumes that translation from a first language (L1) into a second language (L2), or forward translation, is mediated by an underlying conceptual memory, whereas L2-to-L1, or backward, translation is lexical and direct. Lexical links from L2 to L1 are hypothesized to be stronger than those from L1 to L2, but conceptual links are stronger for L1 than L2. These assumptions were evaluated in this study, which used stimulus items with similar recognition thresholds. Proficient Chinese-English bilinguals were tested on picture naming, word naming, word translation and category matching. The translation asymmetry effect predicted by the model (i.e., backward being faster than forward translation) was demonstrated; matching an L1 item to a category name was also faster than matching an L2 item. This pattern of results, nevertheless, did not completely hold after an adjustment procedure which sought to control for variations in response production and concept retrieval times due to stimulus types. The present findings are consistent with previous ones which show increased L2 conceptual processing for the proficient bilingual. They also suggest that an extended version of the asymmetry model should take into account possible biasing effects associated with some conventionally used bilingual tasks.     

ASSESSMENT AND TRAINING OF CLINICAL INTERVIEWING SKILLS: ANALOGUE ANALYSIS AND FIELD REPLICATION

Two studies were conducted to assess and train clinical interviewing skills. In Experiment 1, eight university practicum students (“therapists”) and either role played or volunteer “clients” were audiotaped during simulated interviews. Following the collection of baseline data on both therapist and client responses, training was provided by way of written materials, classroom instruction and practice, and quizzes. Results of a multiple baseline design across subjects showed improvements in therapists' interviewing skills and subsequent increases in client responding. Experiment 2 replicated and extended the research to a hospital outpatient clinic, in which therapists interviewed the parents of children with behavior problems. In addition, four months following the completion of Experiment 2, follow-up data collected during a maintenance condition showed continued high levels of therapist and client behavior. Finally, a panel of expert peers indicated that each response category was judged highly relevant to the behavioral assessment process.     

Does Parental Relational Aggression Interact with Parental Psychological Control in the Prediction of Youth Relational Aggression?

In a sample of 117 youth and their parents, the associations between parental relational aggression, psychological control, youth gender, and youth relational aggression were examined. Boys with parents high on relational aggression and psychological control reported more relational aggression than boys with parents high on relational aggression and low on psychological control. Girls with parents low on relational aggression and high on psychological control reported more relational aggression than girls with parents low on relational aggression and psychological control. Results indicate youth may learn to use relational aggression from their parents, and have implications for intervention with relationally aggressive youth.