Self-categorization theory

Self-categorization theory  suggests that our individual functioning at any given moment is dependent on whether or not we categorize ourselves as similar or different from groups. When we see ourselves as similar to a group, we engage in depersonalization, a key concept in self-categorization theory. Depersonalization is when individuals see themselves as embodying the social category of the group rather than their own personal identities. Therefore, from this perspective the Asch results are interpreted as an outcome of depersonalization processes whereby the participants expect to hold the same incorrect opinions as others in the "group". See also  Asch conformity experiments