Figure 3
Spectral power in ON and OFF windows. (A) Topography of slow-wave activity (SWA; 1–4.5 Hz) within 8 s window snippets (ON1, ON2, OFF) containing few (1–2), medium (3–4) and many (\(\ge\) 5) stimuli within the first 6 s in ON1. The difference in SWA (STIM\(-\)SHAM) in relation to the average of both nights is displayed. White dots represent electrodes with significant differences between conditions (paired t test, cluster corrected, see methods); the black cross indicates the target electrode. (B) Relative power spectral density (PSD, mean ± 95%CI) of 8 s window snippets (ON1, ON2, OFF) belonging to ON|OFF-window pairs which had 1–2 stimuli within the first 6 s in ON1. PSD values within window snippets are normalized to the channel average of the entire ON|OFF window (window- and frequency-wise). Relative PSD values thus indicate a redistribution of PSD within windows. The average PSD of all electrodes is depicted. Bottom panel displays significant differences between conditions (paired t test, FDR corrected).
