Delay-discounting probabilistic rewards: Rates decrease as amounts increase

The independence of delay-discounting rate and monetary reward size was tested by offering subjects (N = 621) a series of choices between immediate rewards and larger, delayed rewards. In contrast to previous studies, in which hypothetical rewards have typically been employed, subjects in the present study were entered into a lottery in which they had a chance of actually receiving one of their choices. The delayed rewards were grouped into small ($30–$35), medium ($55–$65), and large amounts ($70–$85). Using a novel parameter estimation procedure, we estimated discounting rates for all three reward sizes for each subject on the basis of his/her pattern of choices. The data indicated that the discounting rate is a decreasing function of the size of the delayed reward (p < .0001), whether hyperbolic or exponential discounting functions are assumed. In addition, a reliable gender difference was found (p = .005), with males discounting at higher rates than females, on average.     

Parenting typologies in Georgian and Belgian adolescents: Associations with self-esteem

The parenting context is of fundamental importance for the optimal development of adolescents. Making use of a person-centered approach, we derived parenting typologies from the perspective of Georgian and Belgian adolescents based on four dimensions of perceived parenting (responsiveness, structure, psychological control, and autonomy support). Further, we examined how perceived parenting typologies were associated with adolescents' self-esteem. The study sample included 511 Georgian and 830 Belgian adolescents (N = 1341; 48% female). A cluster-analytic procedure on the full sample was conducted separately for mothers and fathers. The analysis yielded five parenting typologies: Supportive—Highly structuring (high responsiveness and structure), Highly structuring—Moderately controlling (high structure and psychological control, moderate—responsiveness), Supportive—Low structuring/controlling (high responsiveness and autonomy support, low structure and psychological control), Highly controlling (very high psychological control, low responsiveness and autonomy support) and Uninvolved (low on all dimensions). Results indicated that the Highly structuring—Moderately controlling paternal cluster was more prevalent in the Belgian sample. A country-moderating effect was found with the paternal Uninvolved profile associated with low levels of self-esteem in Belgian adolescents, but with moderate levels of self-esteem in Georgian adolescents.     

GAP-43 gene expression regulates information storage

Previous reports have shown that overexpression of the growth- and plasticity-associated protein GAP-43 improves memory. However, the relation between the levels of this protein to memory enhancement remains unknown. Here, we studied this issue in transgenic mice (G-Phos) overexpressing native, chick GAP-43. These G-Phos mice could be divided at the behavioral level into “spatial bright” and “spatial dull” groups based on their performance on two hidden platform water maze tasks. G-Phos dull mice showed both acquisition and retention deficits on the fixed hidden platform task, but were able to learn a visible platform task. G-Phos bright mice showed memory enhancement relative to wild type on the more difficult movable hidden platform spatial memory task. In the hippocampus, the G-Phos dull group showed a 50% greater transgenic GAP-43 protein level and a twofold elevated transgenic GAP-43 mRNA level than that measured in the G-Phos bright group. Unexpectedly, the dull group also showed an 80% reduction in hippocampal Tau1 staining. The high levels of GAP-43 seen here leading to memory impairment find its histochemical and behavioral parallel in the observation of Rekart et al. (Neuroscience 126: 579–584) who described elevated levels of GAP-43 protein in the hippocampus of Alzheimer’s patients. The present data suggest that moderate overexpression of a phosphorylatable plasticity-related protein can enhance memory, while excessive overexpression may produce a “neuroplasticity burden” leading to degenerative and hypertrophic events culminating in memory dysfunction.     

Work-Related Flow Dimensions differentially Predict Anxiety,Life Satisfaction,and Work Longevity among Filipino Counselors

Flow at work was associated with optimal psychological outcomes in the organizational setting. However, previous studies have concentrated on work-related flow as an outcome rather than a catalyst of positive psychological functioning. Further, the differential impact of work-related flow domains on key outcomes was still uncharted. To address this empirical gap, the current investigation examined work-related flow dimensions as differential predictors of anxiety, life satisfaction, and work longevity among 133 Filipino guidance counselors. The results of hierarchical regression analyses have shown that work enjoyment served as a robust predictor of anxiety, life satisfaction and work longevity even after controlling for the influence of relevant demographic variables. Absorption positively predicted work longevity. However, intrinsic work motivation did not predict any outcome. Discussion points revolved around the unique theoretical contributions of the current study to the foregoing work-related flow theory and concrete practical implications to emphasize the psychological benefits of work-flow especially in the field of counseling.