Figure 11

Effect of somatosensory stimulation during waking on the nonREM sleep EEG. Interhemispheric asymmetry index [100*(power in left derivation/power in left + right derivation)] of the frontal and central derivation during the first hour of sleep under baseline condition (BL) and after right hand stimulation (STIM). Intermittent vibratory stimulation of the right hand prior to sleep caused a significant shift of EEG power towards the activate hemisphere at the central, but not at the frontal derivation. Closed circles above the abscissa indicate significant differences from baseline (p< 0.05; paired t-test). (Adapted from ref. 83)

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published 2000