Parent-peer influence as a predictor of marijuana use.

Although there is some literature which discusses adolescent reference groups, none have utilized reference group theory to examine the relative impact of the parent and peer reference groups and to attempt to predict behavior among teenagers from this knowledge. This study attempts to correct this deficiency by examining the frequency of marijuana use in a nonrandom sample of college students from a large southwestern university. Ordinal type scales and tau-b provide a statistically strong degree of association between the type of reference group orientation and marijuana use. The results of this study show that the influence of the most salient reference group appears to be an important predictor of whether or not an individual may engage in the use of marijuana.     

Similarity effects in face recognition

Three experiments are described which examine the effects of similarity on face recognition using a new application of hierarchical clustering analysis (HCS). Experiments I and II employed a within-groups design where subjects attempted to recognize targets among decoys from the same and different cluster to the target. Common cluster membership accounted for 72% and 84%, respectively, of all false alarms in the two experiments. Absolute error rates were affected by the number of targets actually present in the array and the style of the instructions given to subjects but were not influenced by whether successive or simultaneous test presentation was employed. Experiment III used a between-subject design where targets were embedded in arrays composed from same or different clusters. False alarm rates were significantly higher for the same cluster condition, but hit rates were unaffected by recognition context. The significance of these findings for theories of face identification is discussed.     

The issue of force and energy in behavioral change

The issue of force and energy in behavioral change involves the following question. Assuming that certain ideas or cognitions help individuals to change their basic personality structure, is it important that these ideas be conveyed by the therapists, or by the clients, to themselves, in a vigorous, forceful and dramatic manner? This question, along with the concomitant one of “intellectual” versus “emotional” insight, has been neglected and avoided in much of the recent literature. This article considers these questions, tries to formulate an operational definition of force and energy in behavioral change, and suggests some specific things that clients may do to achieve “emotional” insight or elegant philosophic reconstruction.     

The material-weight illusion revisited

Experiment 1 documents modality effects on the material-weight illusion for a low-mass object set (58.5 g). These modality effects indicate that the material-weight illusion is principally a haptically derived phenomenon: Haptically accessed material cues were both sufficient and necessary for full-strength illusions, whereas visually accessed material cues were only sufficient to generate moderate-strength illusions. In contrast, when a high-mass object set (357 g) was presented under the same modality conditions, no illusions were generated. The mass-dependent characteristic of this illusion is considered to be a consequence of differing grip forces. Experiment 2 demonstrates that the enforcement of a firm grip abolishes the low-mass material-weight illusion. Experiment 3 documents that a firm grip also diminishes perceptual differentiation of actual mass differences. Several possible explanations of the consequences of increasing grip force are considered.     

Charpentier (1891) on the size-weight illusion

This paper offers background for an English translation of an article originally published in 1891 by Augustin Charpentier (1852-1916), as well as a summary of it. The article is frequently described as providing the first experimental evidence for the size-weight illusion. A comparison of experiments on the judged heaviness of lifted weights carried out by Weber (1834) and by Charpentier (1891) supports the view that Charpentier's work deserves priority; review of other experimental studies on the size-weight illusion in the 1890s suggests that the idea that the illusion depended on "disappointed expectations," especially with respect to speed of lift, became dominant almost immediately following the publication of Charpentier's paper. The fate of this and other ideas, including "motor energy," in 20th-century research on the illusion is briefly described.     

FUZZY-TRACE THEORY AND FRAMING EFFECTS IN CHILDREN'S RISKY DECISION MAKING

Traditional theories of cognitive development predict that children progress from intuitive to computational thinking, whereas fuzzy-trace theory makes the opposite prediction To evaluate these alternatives, framing problems were administered to preschoolers, second graders, and fifth graders Consistent with fuzzy-trace theory, results indicated (a) that younger children focused on quantitative differences between outcomes and did not exhibit framing effects (risk avoidance for gains, risk seeking for losses) and (b) that older children assimilated these quantitative differences and displayed framing effects     

Post-traumatic stress disorder (PTSD): A rational emotive behavioral theory

The PTSD Theory and practice of rational emotive behavior therapy (REBT) is explained and compared with other forms of cognitive behavior therapy (CBT) that help clients to dispute their dysfunctional cognitive processing and to use exposure. Because these other CBT Theoreries do not emphasize REBT's principles of absolutist musts and demands it is shown how REBT hypotheses may better explain some of the cognitive processing theories of other CBT formulations regarding PTSD.