TASK DEPENDENT CEREBRAL LATERALIZATION OF THE 40-HERTZ EEG RHYTHM

Task dependent lateralization of the 40 Hz EEG rhythm and its relationship to 40 Hz EMG activity were investigated in 24 right‐handed subjects. Each subject was administered four tests: verbal analogies, mathematical problems, facial discrimination, and geometric figure rotation. Bilateral EEG and EMG activity were recorded during each of the tests. Lateralization of the 40 Hz EEG rhythm was found during three of the four tasks. No comparable lateralization of 40 Hz EMG activity was found. Results are discussed in terms of 40 Hz EEG as resulting from a focused state of cortical arousal, and of 40 Hz EEG as differentiable from 40 Hz EMG. Copyright © 1979, Wiley Blackwell. All rights reserved