Consistency of task-related EEG asymmetries.

Temporoparietal EEG was recorded bilaterally while 11 subjects performed 4 verbal and 4 spatial tasks on two occasions. Significant differences in integrated EEG asymmetry (8-12 Hz) were found between verbal and spatial tasks in both sessions. Subjects’ verbal-minus-spatial differences in the ratio of left to right integrated amplitude were reliable both between- (r =.88) and within-(mean r =.75) subjects. A percent time measure did not show significant task effects and had poor reliability. For integrated amplitude, the means of the left/right ratios of the 8 tasks were also very consistent between sessions.

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