Do behavioral measures of self-control assess construct-level variance?

The Iowa Gambling Task: Men and Women Perform Differently. A Meta-analysis

The Iowa Gambling Task (IGT) was designed to assess decision-making under conditions of complexity and uncertainty; it is currently one of the most widely used tests to assess decision-making in both experimental and clinical settings. In the original version of the task, participants are given a loan of play money and four decks of cards and are asked to maximize profits. Although any single card unpredictably yields wins/losses, variations in frequency and size of gains/losses ultimately make two decks more advantageous in the long term. Several studies have previously suggested that there may be a sex-related difference in IGT performance. Thus, the present study aimed to explore and quantify sex differences in IGT performance by pooling the results of 110 studies. The meta-analysis revealed that males tend to perform better than females on the classic 100-trial IGT (UMD = 3.381; p < 0.001). Furthermore, the significant heterogeneity observed suggests high variability in the results obtained by individual studies. Results were not affected by publication bias or other moderators. Factors that may contribute to differences in male and female performance are discussed, such as functional sex-related asymmetries in the ventromedial prefrontal cortex and amygdala, as well as differences in sensitivity to wins/losses.

Self-control as a mediator of age on students' compulsive buying

Prior research on compulsive buying addresses a negative association with dispositional self-control and a decreasing effect of age. However, there is currently no sufficient explanation for the observation that older individuals show a reduced risk for compulsive buying patterns. Our empirical contribution is to test the assumption of a reducing effect of dispositional self-control on compulsive buying in a cross-cultural sample of Chinese (n = 268) and German (n = 247) college students with the Short Form of the Self-Control Scale and the Compulsive Buying Scale. We observed that females show a higher proneness to compulsive buying and older participants show decreased compulsive buying. Mediation analysis reveals that age has a reducing effect on compulsive buying that is fully mediated by dispositional self-control. According to the last observation, our study delivers an explanation of the reduced compulsive buying proneness of older individuals. We discuss limitations and alternative explanations of our study.