Abstract
Verbal and nonverbal stimuli were presented tachistoscopically to two groups of deaf subjects, differentiated on the basis of primary communication mode, and to hearing controls. Hearing subjects exhibited a right visual field superiority for the perception of verbal material, and a left visual field superiority for nonverbal material. Deaf subjects whose communication system is exclusively oral showed a left hemifield advantage for the perception of both types of material, while no differences were found on any of the tasks for deaf subjects whose communication is primarily manual. The results are discussed in terms of their implications for underlying patterns of cerebral differentiation in the deaf.
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