Figure 4.

ICSS and NCS manifest similar sleep phenotypes during recovery. Means and standard errors of (A) time in NREMS, (B) NREMS episode duration, (C) NREMS episode frequency, (D) time in REMS, (E) REMS episode duration and (F) REMS episode frequency after NCS (gray bars) and ICSS-2 (white bars), shown as difference from baseline. Gray background indicates lights off. Baseline versus recovery: *P < 0.05. ICSS, intracranial self-stimulation; NCS, noncontingent stimulation; NREMS, nonrapid eye movement sleep; REMS, rapid eye movement sleep.