Bilateral Tachistoscopic Word Perception in Aphasic and Normal Subjects

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Abstract
The present investigation examined the role of the right cerebral hemisphere in linguistic perception following left cerebral insult which had resulted in aphasia. Bilateral tachistoscopic procedures, employing a central fixation mark, were utilized to investigate the visual half-field preferences of 30 aphasic Ss, grouped relative to the amount of time since the onset of left cerebral insult, and a group of 10 normal, control Ss. Statistical analyses indicated a significant left visual half-field preference for the aphasic Ss. In contrast, a significant right visual half-field preference was revealed for the normal, control group. Results did not show a simple decrement in recognition scores of the aphasic Ss but rather a shift in visual-field preference relative to the normal Ss' preference.