Four experiments examined freely interacting groups to investigate the determinants of group members' reactions to opinion deviates and conformists. In the 1st experiment, the deviate was rejected more when he or she articulated the dissenting opinion in close proximity to the group-decision deadline versus at an earlier point in the group discussion. In the 2nd, 3rd, and 4th experiment, the deviate was rejected more when the group discussion was carried out in a noisy versus a quiet environment. Furthermore, when the conformist's contributions to the group's attempts to reach consensus were made salient (in Experiment 4), he or she was evaluated more positively in a noisy versus a quiet environment. The results were discussed in terms of the notion that group members' tendency to denigrate a deviate or extol a conformist may be stronger when their need for collective cognitive closure is heightened.