Changes in interhemispheric amplitude relationships in the EEG during sleep.

Abstract The method of integrative EEG analysis has been used to establish ratios between amplitudes in the left and right cerebral hemispheres during spontaneous sleep in man, in cats and in rabbits. The data indicate that coincident with each occurrence of a shift from a period of slow wave sleep to a period of rapid-eye movement sleep a reversal of the deviations of the individual ratios from the overall mean ratio established for the whole period of recording took place. This indicates a change in interhemispheric amplitude relationships and might be related to the differences in brain function during the two kinds of sleep.