The effects of social motives on behavior in social dilemmas in two cultures

Subjects in Santa Barbara, California, and Groningen, The Netherlands, participated in a seven-person social dilemma game, presented in terms of a conservation of resources problem. Prior to their decision making in the social dilemma game, subject's social motive (altruistic, cooperative, individualistic, competitive) was assessed by means of two different classification procedures. On the basis of previous research findings American subjects were expected to display relatively more competitive social motives, and Dutch subjects relatively more cooperative ones. However, no indications of crosscultural differences were found neither with regard to the distribution of social motives nor with regard to the amount of resources taken for self in the social dilemma game. In both locations, competitive subjects took most resources for self, individualistic subjects took next most, cooperative subjects took less than individualists, and altruistic subjects took the least. In addition to predictive validity, indices of the convergent validity of two social motive assessment procedures were described.     

The syllable-length effect in number processing is task-dependent

Two experiments were run in order to investigate the relationship between syllable length of number names and eye-fixation durations during silent reading of one- and two-digit numbers. In Experiment 1, subjects had to read a series of three numbers and recall them orally; in Experiment 2, subjects had to indicate manually whether the value of the middle number was between the values of the outer numbers. The effect of syllable length was controlled for possible confounding effects of number frequency and number magnitude. Findings indicated that fixation duration depended on syllable length of number names in the first task, but not in the second task. The results call into question the claim that phonological encoding is imperative in visual processing; phonological encoding was used only when the numbers had to be recalled, and not when they were coded for computational purposes.     

Fractional Design Wizard: A computer program for cost-effective experimental research design

The computer program Fractional Design Wizard creates fractional factorial designs that are cost-effective and especially useful for discarding irrelevant factors from a large number of possible candidates. The program is intended for researchers who are relativelynew to the field of fractional design and who want to acquaint themselves with the use of fractions for the reduction of large experimental designs. Fractional designs allow estimation of main effects, and sometimes two-way interactions, without one’s having to examine all treatment conditions. The program needs Microsoft Windows 95 or better and 32 MB of memory. In a step-by-step fashion, the user can specify the required properties of the fractional design. When there are more valid designs, the user can generate these successively If necessary the user can go back to diminish the requirements. The output can be copied, printed, and saved. The program generates all the information that is needed for the use and interpretation of fractional designs. A help file explains the use of the program and also the purpose, the analysis, and the interpretation of fractional designs. The program, which is written in Object Pascal, is available as freeware on www.fss.uu.nl/ms/hl/fracdes.htm.     

Safer Sex in Social Context: Individualistic and Relational Determinants of AIDS‐Preventive Behavior Among Gay Men1

This longitudinal study of gay men examined safer sex within steady relationships and assessed whether relationship quality influenced safer sex with casual partners. The theoretical frameworks of Rusbult's (1980) investment model of romantic relationships and of Ajzen's (1988, 1991) model of planned behavior were used. Unprotected intercourse with a steady partner was practiced significantly more often when both partners in a steady relationship were seronegative and had an explicit agreement to keep it safe with casual partners. However, there was no indication that explicit agreements reduced the occurrence of unsafe extrarelational sex. Both the investment model of romantic relationships and the model of planned behavior were successful in accounting for sexual risk behavior outside the relationship.     

On the likelihood ratio test in structural equation modeling when parameters are subject to boundary constraints

The authors show how the use of inequality constraints on parameters in structural equation models may affect the distribution of the likelihood ratio test. Inequality constraints are implicitly used in the testing of commonly applied structural equation models, such as the common factor model, the autoregressive model, and the latent growth curve model, although this is not commonly acknowledged. Such constraints are the result of the null hypothesis in which the parameter value or values are placed on the boundary of the parameter space. For instance, this occurs in testing whether the variance of a growth parameter is significantly different from 0. It is shown that in these cases, the asymptotic distribution of the chi-square difference cannot be treated as that of a central chi-square-distributed random variable with degrees of freedom equal to the number of constraints. The correct distribution for testing 1 or a few parameters at a time is inferred for the 3 structural equation models mentioned above. Subsequently, the authors describe and illustrate the steps that one should take to obtain this distribution. An important message is that using the correct distribution may lead to appreciably greater statistical power.     

The syllable-length effect in number processing is task-dependent.

Two experiments were run in order to investigate the relationship between syllable length of number names and eye-fixation durations during silent reading of one- and two-digit numbers. In Experiment 1, subjects had to read a series of three numbers and recall them orally; in Experiment 2, subjects had to indicate manually whether the value of the middle number was between the values of the outer numbers. The effect of syllable length was controlled for possible confounding effects of number frequency and number magnitude. Findings indicated that fixation duration depended on syllable length of number names in the first task, but not in the second task. The results call into question the claim that phonological encoding is imperative in visual processing; phonological encoding was used only when the numbers had to be recalled, and not when they were coded for computational purposes.     

Understanding AIDS preventive behavior with casual and primary partners in homosexual men: The theory of planned behavior and the information-motivation-behavioral-skills model

Abstract

This study examined whether components from the Information-Motivation-Behavioral-Skills Model, in particular information, added explanatory power to factors derived from the Theory of Planned Behavior with respect to predicting AIDS-preventive behaviors among gay men. Participants were recruited from a longstanding cohort study in Amsterdam. Multivariate regression analyses showed that concepts from the Theory of Planned Behavior could account adequately for intentions to use condoms with casual as well as with steady partners. Actual behavior was best predicted by past behavior. In addition, structural equation modeling demonstrated that the causal paths as posited by Theory of Planned Behavior had a good fit to the data. From the presented findings implications for preventive interventions can be drawn. Specifically, interventions to increase condom use with casual partners need to focus at improving perceived behavioral control regarding this behavior, for instance through skills training. Interventions aimed at safer sex within steady relationships should take into account that the HIV-status of the individual and his partner plays an important role in the occurrence of unprotected anal sex in a romantic dyad.     

Illness perceptions and coping explain well-being in patients with Huntington's disease

This study sought to investigate the contribution of illness perceptions and coping mechanisms to the explanation of well-being of patients with Huntington's disease (HD). We investigated the Leventhal et al. assumption of the Self-regulation Model that coping mediates the relationship between illness perceptions and patients’ well-being. Illness perceptions, coping, and well-being in 77 HD patients were assessed with validated questionnaires; motor performance and cognitive performance were assessed with Huntington's disease-specific measures. The assumption that illness perceptions influence HD patients’ well-being via coping was not supported. The results indicate that both coping and illness perceptions made a major contribution to the explanation of variance in HD patients’ psychosocial well-being. Variance in their physical well-being was explained by illness perceptions mainly. The need to conduct further research on the interrelationships between illness perceptions, coping, and well-being in this patient category is discussed.     

Developing Successful Communication Strategies: A Test of an Integrated Framework for Effective Communication1

In studies of advertising, many communication strategies have been formulated, but little research has been carried out on the process of deciding what strategy can be used best in a particular situation. In social psychology, models have been developed that specify a number of behavioral determinants. Though communication practitioners often use these models, scientific proof of the effectiveness of persuasive messages based on these models is largely absent. In this study, knowledge from advertising studies and social psychology is combined in an integrated framework for effective communication. In an experiment on chocolate‐bar buying behavior, we prove that by making use of this framework, we can predict which advertising strategy is the most effective.     

Parenting style as a mediator between children's negative emotionality and problematic behavior in early childhood

Negative emotionality is considered to be the core of the difficult temperament concept (J. E. Bates, 1989; R. L. Shiner, 1998). In this correlational study, the authors examined whether the relations between children's negative emotionality and problematic behavior (internalizing and externalizing) were partially mediated by parenting style (authoritative and authoritarian) in a community sample of 196 3-year-old children and their mothers. The authors assessed maternal perception of child negative emotionality using the Children's Behavior Questionnaire (M. K. Rothbart, S. A. Ahadi, K. L. Hershey, & P. Fisher, 2001) and assessed problematic child behavior by means of maternal report using the Child Behavior Checklist (T. M. Achenbach, 1992). The results showed that the relations between child negative emotionality and internalizing and externalizing behaviors were partially mediated by mothers' authoritative parenting style. Moreover, when the authors used confirmatory factor analysis to decontaminate possible overlap in item content between measures assessing temperament and problematic behavior, the association between negative emotionality and internalizing behavior was fully mediated by authoritative parenting.