Group polarization refers to the enhancement of a group's prevailing attitudes through group discussion. the enhancement of a group's prevailing attitudes through group discussion. the lack of critical thinking that results from a strong desire for harmony within a group. the lack of critical thinking that results from a strong desire for harmony within a group. the tendency of individuals to exert more effort when working as part of a group. the tendency of individuals to exert more effort when working as part of a group. a split within a group produced by striking differences of opinion among group members.