Toward Better Prevention: Constructions of Trust in the Sexual Relationships of Young Women

Research on HIV/AIDS interventions indicates that many heterosexual women implement the construct of trust when deciding if preventive measures are necessary. The personal construct model evaluated in this experiment proposes that young women's choice to resist changing from a trust to a nontrust position can be understood in terms of the relationship between their constructs and the hierarchical organization of their construct subsystems. Findings suggest that women with well-defined networks of implications on their nonpreferred pole of the trust/mistrust construct resist HIV-preventive messages that require them to mistrust their partner because the proposed change will involve successive use of subordinate constructs that are incompatible with each other.     

The Effect of Examining Actual Products or Product Descriptions on Consumer Preference

Many consumers purchase products in stores, where they can physically examine and touch the items. In addition, consumers shop for products online or through direct mail, where they cannot physically examine and touch the merchandise. Building on an analysis of perceptual mechanisms involved in the sense of touch, we find that products with primarily material properties, such as clothing or carpeting, are more likely to be preferred in shopping environments that allow physical inspection than in those environments that do not. We also find that there is no difference in preference across the two environments for products with primarily geometric properties, such as packaged goods, for which vision is highly diagnostic. Furthermore, when the touch properties of a material product are verbally described, this reduces the difference in preference between the two environments.     

A Longitudinal Analysis of the Role of Biopsychosocial Factors in Predicting Body Change Strategies Among Adolescent Boys

In this study we examined the role of biopsychosocial factors on adolescent boys' body modification strategies over an 8-month period. Participants were 434 adolescent boys aged between 11 and 16 years. The majority of respondents were from Anglo-Australian backgrounds (83%); the others were from Asian and European non-English-speaking backgrounds. The results indicated a consistent relationship between perceived encouragement to engage in body change strategies and increases in adolescents' body modification strategies, including muscle gain, weight gain, and weight loss. In addition, poor parent relations, being younger, and higher scores on the pubertal development scale predicted increased use of food supplements. However, the stability of the body modification strategies and the examined variables over the 8-month period were low. Further studies are needed to examine the stability of adolescent self-perceptions over both longer and shorter periods. Moreover, researchers need to include other factors that may be more relevant for adolescent boys (e.g., involvement in sports).     

Stimulus Equivalence: Effects Of A Default-response Option On Emergence Of Untrained Stimulus Relations

Human subjects were exposed to a concurrent-chains schedule in which reinforcer amounts, delays, or both were varied in the terminal links, and consummatory responses were required to receive points that were later exchangeable for money. Two independent variable-interval 30-s schedules were in effect during the initial links, and delay periods were defined by fixed-time schedules. In Experiment 1, subjects were exposed to three different pairs of reinforcer amounts and delays, and sensitivity to reinforcer amount and delay was determined based on the generalized matching law. The relative responding (choice) of most subjects was more sensitive to reinforcer amount than to reinforcer delay. In Experiment 2, subjects chose between immediate smaller reinforcers and delayed larger reinforcers in five conditions with and without timeout periods that followed a shorter delay, in which reinforcer amounts and delays were combined to make different predictions based on local reinforcement density (i.e., points per delay) or overall reinforcement density (i.e., points per total time). In most conditions, subjects' choices were qualitatively in accord with the predictions from the overall reinforcement density calculated by the ratio of reinforcer amount and total time. Therefore, the overall reinforcement density appears to influence the preference of humans in the present self-control choice situation.     

Increasing the Generativity of Identity-Based Procedures for Establishing Arbitrary Conditional Relations

The Psychological Record - Previous studies have shown that conditional discrimination training procedures involving identity matching to complex samples can produce emergent arbitrary relations....     

Aggressive Responding in the Laboratory Maintained by the Initiation of a Provocation-Free Interval

The Psychological Record - Four adults participated in an experiment designed to study how the duration of an interval free from provocation, following aggressive responding, affected the...