College students (N=27) were assigned to a time-extended or a marathon group or a control condition to evaluate the effects of encounter experiences on self-perception and interpersonal behavior. Both experimental groups showed significantly greater changes in self-perceptions from pretest to posttest than the control group. (Author)

To determine whether the addition of milieu principles to a contingency program increases its effectiveness, the investigators compared two treatment programs in a mental hospital: (a) a social learning or token economy approach and (b) a combined social learning and milieu approach. (Author)