This study tests the hypothesis that perceived freedom is a function of the probability that actors will behave in a line with their dispositions by varying the pattern of extrinsic rewards associated with the behavior alternatives. Subjects in both experiments are college students. (CM)

Data revealed a similar pattern of personality, environment, and behavior differences between all nonuser and user groups, suggesting a pervasive social-psychological constancy. The same variables were also predictive of the shift from nonuse to use over time among the high school students but not the college students. (JB)