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. Author manuscript; available in PMC: 2009 May 16.
Published in final edited form as: Behav Brain Res. 2008 Jan 4;189(1):41–51. doi: 10.1016/j.bbr.2007.12.019

Figure 2. EEG spectral profiles of vigilance state EEGs.

Figure 2

Data are mean (normalized) Fourier transformed EEGs from REM sleep, NREM sleep and wakefulness (P30–P45 n=8, P50 n=6, P55 n=4). Note that NREM slow-wave activity increases sharply between P30 (A) and P35 (B) and that a peak in the theta frequencies is first evident at P40 (C).