Abstract
This study was conducted with the aim of evaluating the effect of delayed auditory feedback (DAF) on patients with unilateral hemispheric damage. The experimental subjects consisted of three groups of 15 persons: normal male subjects in their fifties, the patients with left sided hemispheric damage and these with the right sided respectively. Each subject was asked to read a list consisting of 50 Japanese syllables under NAF (normal auditory feedback) and DAF with a delay of 0.2 seconds. The experiment was conducted by presenting DAF to one ear during the task with white noise masking the other ear. Two indices of DAF effect were employed: number of articulatory errors and total speaking time.As a result, a significantly greater number of articulatory errors occurred when presenting DAF to the ipsilateral ear of hemispheric damage than to the contralateral. In the measurement of total speaking time, however, no significant differences between the ears were found.
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