Is there an optimal level of positive and negative feedback in group therapy? A response surface analysis.

Interpersonal feedback is an important process in group therapy. Feedback can be both positive and negative, and group researchers have noted the importance of both positive and negative feedback in fostering cohesive groups and evoking behavioral change (Yalom & Leszcz, 2005). However, there is a paucity of research examining the amount and valence (i.