Cerebral asymmetry in 2 experiments using dichotic delayed auditory feedback (DAF) and immediate auditory feedback (IAF) was investigated. In Experiment I, 18 male and 18 female right-handed 18-30-yr.-old 5s were presented with DAF and IAF on a simple verbal repetition task. In Experiment II, ear and hand differences were assessed on a tapping test under DAF and IAF in 15 male and 5 female 18-32-yr.-old 5s. The intensity of the DAF at which an error occurred served as the measure of disruption. Right-ear DAF was more disruptive on the verbal activity and left-ear DAF on the tapping task. Findings supported a cerebral laterality explanation. It was noted that individual ear differences were not sufficiently clear-cut to support the use of this DAF method in a clinical context.
Five right·handed Ss listened to stimuli presented alternately to each ear at a rate of 2/sec and adjusted the precise timing of the stimulus to one ear so that the rhythm appeared completely regular. The mean errors in this setting were measured for a control condition with loud stimuli, and for an experimental condition with near·threshold stiml.J.li, and sinusoidally modulated white noise in the ear opposite to the stimulus. The results show a significant difference of about 4 msec between the two conditions, the stimulus to the right ear being apparently delayed in the experimental condition relative to the stimulus to the left ear. This suggests that the right cerebral hemisphere is involved in the perception of rhythmic stimuli.
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