Abstract
Evidence of cerebral lateralization was found in children of 3, 4, and 5 yr of age, A dichotic listening experiment revealed a right ear advantage for verbal stimuli and a left ear advantage for nonverbal stimuli in children at these ages. During the finger tapping experiment, secondary tasks (reciting and humming) reduced both left and right index finger tapping rates. However, reciting disproportionately reduced tapping on the right while humming disproportionately reduced tapping on the left finger in each of the three age groups. The asymmetry of function revealed in both experiments suggests that the left hemisphere is in some sense specialized for verbal functions, and the right hemisphere for nonverbal functions by the age of 3.
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