The authors address the debate on pancultural self-enhancement by suggesting that some Japanese enhance their self-worth by praising and receiving praise from others included in the self. The authors call this process “mutual self-enhancement” and validated a scale for its measurement in Japan and the United States. Mutual self-enhancement was positively correlated with including others in the self, relational self-construal, family support, and sympathy. Mutual self-enhancement was not related to the interdependent self, collectivism, and approval from others, confirming that the process involves including others in the self via self-expansion rather than fitting into an interdependent relationship network. Future studies based on the self-expansion model will consider the inclusion of in-group members in the self as an important part of mutual self-enhancement that predicts well-being in East Asian countries such as Japan.
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