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Studied left-right differences between ears employing delayed auditory feedback (daf). 31 male and 25 female students were timed while reading prose passages and word lists and while piano playing. Reading times were found to be significantly lengthened with disruptive daf to the right ear, and playing times were similarly increased when the daf was played to the left ear, under certain conditions of dichotic stimulation. These effects occurred when a secondary input to the other ear consisted either of long-delayed nondisruptive feedback, or instantaneous amplified or attenuated feedback, but were not apparent with constant-level 90-db white noise. The need for competitive stimulation to obtain left-right differences is considered, together with the possible contributions of handedness, cerebral asymmetry, ipsilateral pathways, and transcommissural routes. Findings are also discussed in terms of attentional processes. (63 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

(C) 1971 by the American Psychological Association