Positive and negative reinforcement: Should the distinction be preserved?

Michael (1975) reviewed efforts to classify reinforcing events in terms of whether stimuli are added (positive reinforcement) or removed (negative reinforcement). He concluded that distinctions in these terms are confusing and ambiguous. Of necessity, adding a stimulus requires its previous absence and removing a stimulus its previous presence. Moreover, there is no good basis, either behavioral or physiological, that indicates the involvement of distinctly different processes, and on these grounds he proposed that the distinction be abandoned. Despite the cogency of Michael's analysis, the distinction between positive and negative reinforcement is still being taught. In this paper, we reconsider the issue from the perspective of 30 years. However, we could not find new evidence in contemporary research and theory that allows reliable classification of an event as a positive rather than a negative reinforcer. We conclude by reiterating Michael's admonitions about the conceptual confusion created by such a distinction.     

Response Mode Effects and Moral Values

In five studies, we measured the extent to which subjects weight moral product attributes in different response modes. We found that nonprice judgments such as likelihood of purchase ratings were more reflective of expressed moral attitudes than were pricing responses, and that holistic price evaluations were especially unlikely to reflect moral considerations. Post-task ratings confirmed the preference results, as did an experiment controlling for the influence of task goals. Our results have implications for compatibility theories of preference elicitation, the predictability of respondent ratings of attribute unacceptability, and the measurement of utilities for morally charged attributes.     

The moderator-mediator variable distinction in social psychological research: conceptual, strategic, and statistical considerations

In this article, we attempt to distinguish between the properties of moderator and mediator variables at a number of levels. First, we seek to make theorists and researchers aware of the importance of not using the terms moderator and mediator interchangeably by carefully elaborating, both conceptually and strategically, the many ways in which moderators and mediators differ. We then go beyond this largely pedagogical function and delineate the conceptual and strategic implications of making use of such distinctions with regard to a wide range of phenomena, including control and stress, attitudes, and personality traits. We also provide a specific compendium of analytic procedures appropriate for making the most effective use of the moderator and mediator distinction, both separately and in terms of a broader causal system that includes both moderators and mediators.     

Self-Presentation in Job Interviews: When There Can Be “Too Much of a Good Thing”1

Male and female subjects interviewed female applicants for an entry-level management position. The applicants were actually confederates of the researcher who engaged or did not engage in two different tactics of self-presentation: the emission of many positive nonverbal cues and the use of one popular grooming aid (perfume). It was predicted that alone, each of these tactics would enhance ratings assigned to the applicants. However, together, they would induce negative reactions among interviewers (e.g., attributions of manipulativeness to the applicant). It was further hypothesized that such reactions would be stronger among male than among female interviewers. Finally, it was predicted that the two self-presentational tactics investigated would affect interviewers' memory for information presented by the applicants. Results offered support for all of these hypotheses.     

Environmentally Induced Positive Affect: Its Impact on Self-Efficacy,Task Performance,Negotiation, and Conflict1

Male and female subjects performed several tasks either in the presence or absence of an environmental source of positive affect (pleasant artificial scents produced by two commercially manufactured air-fresheners). Consistent with the findings of previous research on the impact of positive affect, results indicated that several aspects of subjects' behavior were influenced by this variable. Participants exposed to pleasant scents set higher goals on a clerical coding task and were more likely to adopt an efficient strategy for performing this task than subjects not exposed to such conditions. In addition, males (but not females) reported higher self-efficacy in the presence of pleasant artificial scents than in their absence. Participants exposed to pleasant scents also set higher monetary goals and made more concessions during face-to-face negotiations with an accomplice. Finally, subjects exposed to pleasant scents reported weaker preferences for handling future conflicts with the accomplice through avoidance and competition. Analyses of covariance suggested that these differences stemmed largely from contrasting levels of positive affect among subjects in the neutral and pleasant scent conditions. Together, these results suggest that pleasant artificial scents may provide a potentially useful means for enhancing the environmental quality of work settings, and hence the performance and attitudes of persons in them.     

Genetic differences in avoidance learning by Rattus norvegicus: escape/avoidance responding, sensitivity to electric shock, discrimination learning, and open-field behavior

The behaviors of rats selectively bred for either good or poor shuttle box avoidance learning were studied. The results of Experiment 1 indicated that the phenotypic difference in avoidance learning is not associated with differences in speed of escape or avoidance responding. Differences between the lines in frequency of intertrial responses (ITRs), which appear during training but not during pretest, suggest that ITRs in animals of the low-avoidance (SLA) line are more suppressed by electric shock than in animals of the high-avoidance (SHA) line. This result suggests that SLA animals may be more emotionally responsive than SHA animals. Experiment 2 demonstrated that the animals of the two lines do not differ in absolute sensitivity to electric shock, and Experiment 3 showed that the poor performance of the SLA line is not due to an inability to learn. Experiment 3 also provided evidence which suggests that the poor avoidance learning by SLA animals is due to their emotional reactivity. Observations of open-field behavior in Experiment 4 are consistent with this hypothesis. The major consistent correlate of the phenotypic difference in avoidance learning is greater emotionality or emotional reactivity in SLA than in SHA animals.     

Gender differences in attributions about microcomputer learning in elementary school

To investigate whether girls' attributions about computer use were more likely to follow a pattern of learned helplessness, boys' and girls' attributions about a computerized drill-and-practice task and a tutorial program were assessed. Factor analysis of responses on an attribution questionnaire revealed three factors that differed across gender and across task. Multiple regression, using exposure time, group size, attributions, and interactions to predict posttest scores, showed different patterns for boys and girls and between tasks. For the drill-and-practice task, girls benefited from increased exposure time, and attributions to ease of task and ability predicted performance for both boys and girls. For the tutorial task, increased exposure time did not benefit either sex. Girls, however, benefitted from working in larger groups, while boys benefitted from working in smaller groups. Attributions to luck, as well as perceptions of ability and ease of task, predicted posttest scores. However, for girls, attributions to luck predicted higher scores, while for boys, attributions to luck were negatively correlated with performance. Implications for including appropriate feedback to encourage a mastery approach in computer learning, as well as optimal group size and group composition for positive attributional style and academic success, are discussed.This research was supported by Concordia University and the Fonds Pour la Formation des Chercheurs et l'Aide a la Recherche (Grant EQ-2951), Government of Quebec, Canada.The authors wish to thank Ms. Patricia Peters for assistance with the statistical analysis, and Dr. Philip Abrami, for his contribution to the project.