Abstract

The effects of a presumed unilateral brain lesion on language functions are examined i n a case of “pure word deafness.“ The patient (WB) was totally impaired in his auditory perception of speech while retaining much written comprehension, spontaneous speech and writing. As is usually the case, the word deafness was contaminated by some indication of auditory agnosia and some specific aphasic deficits. The patient's performance on auditory-tactile iTiakhing tests provides a striking contrast with the performance of split-brain patients. The right hemisphere in these patients is able to make both a visual-tactile and an auditory-tactile match between word and object. Case WB, on the other hand, was unable to make an auditory-tactile match. A possible explanation for the lack of right hemispheric language function in this case is offered. The damaged left hemisphere may have an interfering effect on the potential linguistic capacity of the nondominant hemisphere.

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