Critique of Miller's "degree of lateralization as a hierarchy of manual and cognitive skill levels"

M E Smith


Miller (Neuropsychologia 20, 155-162, 1982) reported a correlational study in which an association between handedness measures and tests of cognitive development was found. It was concluded that the degree to which manual dexterity is lateralized predicts cognitive development, and that these measures are related aspects of the development of cerebral specialization. This conclusion is questionable in that the intellectual skills necessary for performance on the cognitive development tests are probably not functionally lateralized. In addition, when the influence of chronological age is partialled out, there is no residual correlation between lateralization of manual dexterity and cognitive performance.


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