Rapid changes in arousal states of healthy volunteers during robot-assisted gait training: a quantitative time-series electroencephalography study

Table 1 Absolute and relative alpha power densities in the occipital region

Absolute power density (mean ± SE, μV²)		Relative power density^a(mean ± SE, %)
Eyes closed	Eyes open	Eyes closed	Eyes open
23.9 ± 3.5*	2.4 ± 0.2	60.8 ± 2.4*	26.0 ± 1.7

*paired t-test, eyes closed vs. eyes open, P < .0001.
^aRelative power density = {absolute power density of the alpha band (8.0–12.9 Hz)}/{absolute power density of the global EEG band (2.0–30.0 Hz)} × 100 (%).

ISSN: 1743-0003