SOs, spindles, and SPWRs during NREM sleep in the non-learning control Experiment 2. A, Mean density per minute (left) and amplitude (right) of SO in CG (circles) and IL (squares) B, Mean density per minute (left) and amplitude (right) of spindles in CG (circles) and IL (squares). Spindle density in IL is significantly reduced in the OPTO condition. C, Mean density per minute (left) and peak-to-peak amplitude (right) of SPWR in dHC. For CG and IL: N = 19; for hippocampus: N = 16. Within-subject design. Red symbols, OPTO; black symbols: CTRL. Error bars indicate SEM. *p < 0.05.