This study explored the hypothesis that Japanese children perform significantly better on simultaneous processing than on sequential processing. The K-ABC served as the criterion of the two types of mental processing. Regression equations to predict Sequential and Simultaneous processing from McCarthy performance were derived from three validity studies of the K-ABC in which 123 American children were tested on both the McCarthy Scales and the K-ABC and were applied to Lynn's analysis of Japanese McCarthy standardization data. Results of these analyses supported the hypothesis that Japanese children show a preference for simultaneous processing across virtually the entire 2 1/2- to 8 1/2-yr. age range.
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