Figure 10.

Pie charts presenting the mean percentage of time spent in wakefulness, quiet sleep, and active sleep during the first hour (top) and the 3 hr recording period (bottom) after the combined injection of scopolamine and bicuculline or scopolamine and carbachol, respectively. Compared with the percentages observed after the injection of scopolamine and carbachol (n = 5), the injection of scopolamine did not block the increase in the percentage of time spent in active sleep (p < 0.01) or the reduction in the percentage of time spent in quiet sleep (p < 0.05) and wakefulness (p < 0.05) induced by bicuculline (n = 6) during the first hour of recording. During the 3 hr recording period, the injection of scopolamine and bicuculline produced significant changes only in the percentage of the time spent in active sleep (p < 0.01).