Abstract
Mfost of social psychology's theories of the self fail to take into account the significance of social identification in the definition of self. Social identities are self-definitions that are more inclusive than the individuated self-concept of most American psychology. A model of optimal distinctiveness is proposed in which social identity is viewed as a reconciliation of opposing needs for assimilation and differentiation from others. According to this model, individuals avoid self-construals that are either too personalized or too inclusive and instead define themselves in terms of distinctive category memberships. Social identity and group loyalty are hypothesized to be strongest for those self-categorizations that simultaneously provide for a sense of belonging and a sense of distinctiveness. Results from an initial laboratory experiment support the prediction that depersonalization and group size interact as determinants of the strength of social identification.

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