Abstract
Previous studies of the development of information processing in children have frequently been methodologically suspect and inconclusive in outcome. A study was designed to overcome some of the difficulties encountered in earlier studies. Six boys and six girls at each year of age from 5 to 11 inclusive were tested for one week on a serial, numerals-keys choice reaction time task with 2, 4, and 8 alternatives. Results were consistent with Hick's (1952) law. Both reaction time (RT) and the rate of gain of information improved with age, but the intercept constant, a more labile index, did not. These findings suggest that development is largely restricted to the process of response selection within a 4-stage decomposition of RT. Girls consistently exhibited both faster RTs and higher rates of gain of information than boys. These sex differences are interpreted in relation to recent notions of cerebral maturation in males and females.
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