Supplementary Figure 4: Sample EEG Recordings During tACS
From: Induction of self awareness in dreams through frontal low current stimulation of gamma activity
EEG and EMG data recorded during sham condition (top) and with tACS stimulation of 12 Hz (center), respectively 40 Hz (bottom). The EEG at site Fpz is shown unfiltered while the EMG is filtered to demonstrate that subject remained in REM sleep throughout stimulation; awakening (sham: t = 220 s, 12 Hz: t = 195 s, 40 Hz: t = 215 s) is signaled by a marked change in the EMG. Note also that the EEG samples shown are not corrected for ocular artefacts. The horizontal accolades schematically indicate the phases defined in the main text, namely, before stimulation (I), during stimulation (II), as well as after forced awakening (IV). During phase II, the tACS current is applied for 30 s generating the very large amplitudes indicated as a solid blue block in the unfiltered EEG (center and bottom frames). Phases I, II, and III (not indicated here) cover REM sleep, and phase IV corresponds to wakefulness
