Two studies examined models that preschoolers, fifth-graders, and adults use to guide predictions of self-beneficial, goal-directed action. Found that preschoolers' predictions were consistent with an animal-based model, fifth-graders' with biology-based and complexity-based models, and adults' predictions with a biology-based model. All age…

Examines the initial reactions of type A and type B boys and men to uncontrollable events. Type A individuals are characterized by extremes of competitive achievement striving, impatience, and aggression, a pattern of behavior implicated by recent research in the etiology of coronary heart disease. Type B individuals exhibit the relative absence…