The present study examined effects of subject person, object person, and their interactions on personality cognition. Seven undergraduates rated both their own personality and that of the other six peers three times, using the Seikenshiki Personality Inventory. A factor analysis of the rating data yielded four personality factors: Extraversion, Egocentrism, Neuroticism, and Endurance. Two-way ANOVAs on factor scores showed that all main effects of object person and subject person as well as all interaction effects were significant. However, the magnitude of these effects varied for each personality factor. Object person showed the largest effect for Extraversion, while subject person showed the largest effect for Egocentrism; for Endurance, both of them showed considerable effects; and the interaction effect was large for Neuroticism. These results suggest that not only object person but both subject person and their interaction affect personality cognition.
