This study examined a relationship between psychological differentiation and extraversion and possible sex differences in performance. A significant curvilinear relationship was observed for boys only. Boys were more field independent and extraverted than girls. Subjects were 192 (109 girls and 83 boys), students in Grades 11 and 12 from private and public schools in Oshawa and Ottawa, Canada. Their mean age was 17.4 yr. Psychological differentiation was measured by the Group Embedded Figures Test and extraversion by the Eysenck Personality Inventory, Form B.
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