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Figure 3 | BMC Neuroscience

Figure 3

From: Homeostatic regulation of sleep in the white-crowned sparrow (Zonotrichia leucophrys gambelii)

Figure 3

Differences in the EEG power spectrum between vigilance states during the baseline dark period. A. The relative EEG power spectrum of drowsiness, SWS, and REM sleep is plotted as percentage of the waking EEG power spectrum. Spectra refer to the first 6 hours of the dark period for all vigilance states except REM sleep, where the entire dark period contributed to the average spectrum. Values are means (± SEM, n = 6) of relative power density for each frequency bin (0.25 Hz, range: 0–25 Hz). The horizontal bars above the abscissa indicate frequency bins that differed significantly between vigilance states (p < 0.05, 2-tailed paired t-test). Waking (W), drowsiness (D), SWS sleep (S) and REM sleep (R). B. Mean slow wave activity (SWA, 0.5–4 Hz) in drowsiness, SWS and REM sleep expressed as percent of SWA in waking. Asterisks denote significant differences between states after correction for multiple comparisons.C. Time course of the EEG power spectrum in drowsiness and SWS and the two states combined (NREM) for the first three 2-hour intervals of the dark period. For each frequency bin (0.25 Hz) values are expressed as means (± SEM, n = 6) relative to the mean EEG power spectrum in that bin over the entire dark period in the corresponding vigilance state. Horizontal bar depicts frequency bins where 1-way repeated measures ANOVA (factor "time interval") was significant (p < 0.05)

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