The Role of Identity in Human Behavior Research: A Systematic Scoping Review

Many theories of motivation recognize a person's identity adds value to the prediction of behavior; albeit indirectly, through constructs such as social norms, self-efficacy, perceived behavioral control, and values. Recently, behavioral research has more directly assessed the influence of identity on behavior; however, it is unclear whether such research aligns with the theoretical establishments of identity. This review investigated the identity theory alignment of existing behavior research by systematically searching, screening, and reviewing identity-behavior relevant papers, across three behavioral psychology databases. Twenty-three papers meet the inclusion criteria for review (original research with a primary focus on identity and behavior, within healthy adult population), and data relating to identity-behavior theoretical viewpoints, research methods, and study findings were extracted and synthesized to provide a scoping overview of current research. Most reviewed papers presented identity as a loosely defined construct; commonly operationalized as social identity, omitting the theorized multiplicity of social and self-identities. Overall outcomes suggested that identity influences behavior indirectly through intention strength, rather than directly as a post-intention mechanism. While existing research has been crucial in illuminating potential influences of identity on behavior, there is a need to strengthen current understandings and theoretical alignments within future research relating to identity and behavior.