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Science 8 October 1971:
Vol. 174. no. 4005, pp. 164 - 166
DOI: 10.1126/science.174.4005.164
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Articles

Hemispheric Asymmetry of Electrocortical Responses to Speech Stimuli

Lenore K. Morrell 1 and Joseph G. Salamy 2

1 Department of Medicine, Stanford University School of Medicine, Stanford, California 94305, and Neuropsychology Laboratory, Veterans Administration Hospital, Palo Alto, California 94304
2 Department of Psychiatry, University of California Medical Center, San Francisco 94122, and Veterans Administration Hospital, Palo Alto, California 94304

In a group of normal adults, averaged cortical evoked responses to natural speech stimuli were recorded from scalp electrodes placed symmetrically over the two cerebral hemispheres at frontal, Rolandic, and temporoparietal leads. The amplitude of the most prominent component was consistently larger in left hemisphere derivations, with the major hemisphere difference observed in the temporoparietal records. These electrophysiological measures may be sensitive indicators of hemispheric specialization of function.


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