Personal identity and social identity: two different processes or a single one? / Identidad personal e identidad social. ¿Dos procesos diferentes o uno solo?

Abstract Personal identity, or the definition of oneself in terms of personal idiosyncratic attributes, and social identity, or the definition of oneself in terms of affiliations with different categories or groups, have often been examined as two separate phenomena in the psychosocial literature. However, there are at least two theories which have deliberately researched the relationship between the two. One of these theories has done so for almost five decades (Social Identity Theory), while the alternative approach (Identity Fusion, or the visceral sense of oneness with the group) began to be developed less than one decade ago. The purpose of this special issue is to survey how approaches grounded upon both theories have attempted to explain some individuals’ extreme behaviours for their group. It also includes studies that examine the origins of identity fusion, the processes that relate it with extreme behaviour (such as the extension of familial ties to groups or the acceptance of violence), as well as a subtle demonstration of how group identity can affect interpersonal relationships.