Changes in EEG spectral power induced by theta-tDCS during REM sleep.

<p>Spectral power for theta-tDCS (black lines) and sham stimulation (gray lines) averaged across all EEG locations (A) and for submental electromyographic (EMG) activity (B). Time course of gamma band activity during the five 1-min stimulation-free periods immediately succeeding the stimulation intervals (S1–S5), averaged across all electrode sites for theta-tDCS (black bars) and sham stimulation (empty bars) (C). ‘Ba’ refers to baseline activity prior to stimulation. **, P<0.01; *, P<0.05; for comparisons between the theta-tDCS and sham stimulation conditions by t-test (n = 16).