People are generally motivated to increase the diversity of their self-concepts, within their relationships and outside of them. Self-expansion enhances both individual and relationship well-being; however, almost no research has investigated what circumstances attenuate people’s desire for self-expansion. The present research addressed this question by testing the central hypothesis that experiencing lower self-concept clarity would predict less interest in self-expansion. Across three studies, the present research demonstrated that individuals primed with low self-concept clarity expressed less interest in self-expansion outside of romantic relationships (Studies 1–2) and were less likely to actually self-expand by incorporating attributes from a potential romantic partner into the self (Study 3). Despite the benefits of self-expansion, certain situations may reduce people’s desire to add content to the self.
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