Formal operations and ego identity in adolescence.

This study investigated the relationship between the development of formal operations and the formation of ego identity in adolescence. Two Piagetian formal tasks, the combinatorial and equilibrium in the balance, and two measures of ego identity, a semistructured interview and an incomplete sentences test, were administered to 20 males and 20 females each at age levels 10-12, 13-15, and 16-18 years. Significant positive correlations were obtained between combinatorial ability and degree of identity, suggesting that high identity may facilitate the application of combinatorial operations. Males exhibited superior performance on the balance task; thus they may utilize more effective cognitive strategies, or be more inherently motivated to solve mechanical problems than females. On the identity interview, females showed a greater degree of commitment to future goals than males in middle adolescence; this may reflect the earlier maturation of females.