Figure 2.

Effects of NA depletion on behavioral states [controls, n = 27; NA depleted (depl.), n = 16]. In this and the following figures, NA-depleted rats are those animals in which NA levels were <10% relative to saline-treated controls. Top, Time course of the amount of wakefulness, NREM sleep, and REM sleep during 24 h of baseline (12 h light/dark condition). Bars represent 6 h mean values (+SEM) expressed as a percentage of recording time. Bottom, Mean absolute EEG power values (μV²/0.5 Hz) of the 24 h baseline during wakefulness, NREM, and REM sleep. Values represent EEG power per 0.5 Hz bin (±SEM) on a logarithmic scale (parietal derivation).