Melioration--defined as choosing a lesser, local gain over a greater longer term gain--is a behavioral tendency that people and pigeons share. As such, the empirical occurrence of meliorating behavior has frequently been interpreted as evidence that the mechanisms of human choice violate the norms of economic rationality. In some environments, the…

A theory of timing is proposed, based on the observation that signals of reinforcement elicit adjunctive behaviors. Transitions between these behaviors are described as a Poisson process. These behaviors may come to serve as the basis for conditional discriminations of the passage of time. (SLD)

This article critically examines the evidence for interpersonal complementarity according to four recent theories. The only prediction found to be regularly supported is that friendly-dominant and friendly-submissive behaviors are complementary. A repeated finding is that hostile-dominant acts are frequently responded to with further…

Diverse data challenge and undermine the central assumptions of the traditional trait approach to personality. The implications for conceptions of individual differences and situations in the study of personality are examined. (Author)