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Abstract
EEG activity of eight male volunteers was monopolarly recorded at P3 and P4 during an initial baseline and during performance of three series of cognitive tasks: one verbal, one spatial and one “mixed” demanding verbal and spatial processing. Interhemispheric correlation of the EEG activity was compared among tasks and between successful and unsuccessful trials. There was a significant main effect for success or failure of cognitive processing with increased interhemispheric correlation during unsuccessful trials regardless of their nature. There was no main effect for tasks. Interhemispheric correlation proved to be sensitive to success or failure in information processing.