Table 2. Spectral power in gamma band, ∆[HbT], and arteriole diameter (∆D/D) at 0.01 Hz.

Spectral Power at 0.01 Hz	Alert	Asleep	All Data d
Gamma band Power (a.u.)	5 ± 3.2	34 ± 51 (p<0.001)	21.7 ± 20.6 (p<0.06)
∆[HbT] Power (a.u.)	36.5 ± 28.6	176.2 ± 98.9 (p<5.3 × 10−10)	128.9 ± 63.8 (p<7.9 × 10−6)
∆D/D Power (a.u.)	34.9 ± 25		45.6 ± 33.6 (p<0.06)

Mean ± 1 standard deviation. p-values as a comparison to ‘Alert’. Shaded region indicates insufficient data for that arousal state.