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Individual differences in loop gain between sleep states. (A) shows individual participant differences between N2 and N3 (p = 0.750, n = 24), (B) N3 and REM (p = 0.25, n = 21), and (C) N2 and REM (p = 0.750, n = 39). Group means with error bars representing standard error of the mean are shown adjacent to the individual data columns. P-values reported correspond to the results of within-participants t-test.
