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Asymmetrical Brain Electrical Activity Discriminates Between Psychometrically‐Matched Verbal and Spatial Cognitive Tasks

Asymmetrical Brain Electrical Activity Discriminates Between Psychometrically‐Matched Verbal and... This study compared the asymmetry of different features of brain electrical activity during the performance of a verbal task (word finding) and a spatial task (dot localization) that had been carefully matched on psychometric properties and accompanying motor activity. Nineteen right‐handed subjects were tested. EEG was recorded from F3, F4, C3, C4, P3, and P4, referred to both Cz and computer‐derived averaged‐ears references, and Fourier transformed. Power in the delta, theta, alpha, and beta bands was computed. There were significant Task X Hemisphere effects in all bands for Cz‐referenced data and for the alpha and beta bands for ears‐referenced data. The effects were always either greater power suppression in the hemisphere putatively most engaged in task processing or greater power in the opposite hemisphere. Correlations between EEG and task performance indicated that Cz‐referenced parietal alpha asymmetry accounted for the most variance in verbal task performance. Power within individual hemispheres or across hemispheres was unrelated to task performance. The findings indicate robust differences in asymmetrical brain physiology that are produced by well‐matched verbal and spatial cognitive tasks. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Psychophysiology Wiley

Asymmetrical Brain Electrical Activity Discriminates Between Psychometrically‐Matched Verbal and Spatial Cognitive Tasks

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References (49)

Publisher
Wiley
Copyright
Copyright © 1990 Wiley Subscription Services
ISSN
0048-5772
eISSN
1469-8986
DOI
10.1111/j.1469-8986.1990.tb01970.x
Publisher site
See Article on Publisher Site

Abstract

This study compared the asymmetry of different features of brain electrical activity during the performance of a verbal task (word finding) and a spatial task (dot localization) that had been carefully matched on psychometric properties and accompanying motor activity. Nineteen right‐handed subjects were tested. EEG was recorded from F3, F4, C3, C4, P3, and P4, referred to both Cz and computer‐derived averaged‐ears references, and Fourier transformed. Power in the delta, theta, alpha, and beta bands was computed. There were significant Task X Hemisphere effects in all bands for Cz‐referenced data and for the alpha and beta bands for ears‐referenced data. The effects were always either greater power suppression in the hemisphere putatively most engaged in task processing or greater power in the opposite hemisphere. Correlations between EEG and task performance indicated that Cz‐referenced parietal alpha asymmetry accounted for the most variance in verbal task performance. Power within individual hemispheres or across hemispheres was unrelated to task performance. The findings indicate robust differences in asymmetrical brain physiology that are produced by well‐matched verbal and spatial cognitive tasks.

Journal

PsychophysiologyWiley

Published: Jan 1, 1990

Keywords: ; ; ;

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