This study is an initial report in a research program to examine the nature and influence of one set of structural variables--participation patterns--on patterns of interaction in sensitivity training groups. (Author)

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)

The role of feedback in T-groups was studied. Results indicate that feedback increases as T-groups progress, feedback is more emotional and non-evaluative than cognitive in nature, positive and direct feedback to the leaders increases as the group develops, and specific feedback between members increases as groups progress. (SE)