RUBIN, KENNETH H. Egocentrism in Childhood: A Unitary Construct? CHLD DEVELOPMENT, 44, 102-110. 10 boys and 10 girls in each of grades kindergarten, 2, 4, and 6 were individually tested on measures of communicative, cognitive (private speech), role-taking, and spatial egocentrism. Measures of conservation skills, popularity, and intelligence were also taken. Egocentrism decreased significantly with age on all measures. A factor analysis revealed a single factor, reflecting the high interrelationships among role-taking, communicative, and spatial egocentrism, as well as conservation. Mental and chronological age also loaded significantly on the primary factor, suggesting that experience accrued with age facilitates decentration. Both theoretical and methodological difficulties were cited as reasons for the failure of cognitive egocentrism to load on the decentration factor.
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Kenneth H. Rubin (1973) studied this question.
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