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Interaction between handedness and cerebral functional dominance.

The relationship of handedness and cerebral functional dominance in man and in other animals is reviewed. It is concluded that there is a two-way interaction between these two phenomena. Firstly, the dominant hand does not necessarily dominate all performances; the hand superiority for a given performance is determined by the degree of cerebral dominance for that particular function. Secondly, the preferred hand asserts its priority in mediating information processing.