Fig. 9.

Combined graphs showing the effects on EEG delta power (light black line), locomotor activity (heavy black line), and body temperature (gray line) of lesions in the dSPZ (A) and the PVH (B). Thelefty-axis demarcates delta power, therighty-axis shows body temperature, and thex-axis is time = 24 hr. Locomotor activity is in arbitrary units. After a dSPZ lesion (A), there was loss of circadian rhythm in body temperature, but delta power and activity from the same animal showed a clear circadian rhythm. InB (PVH lesion), body temperature, EEG delta power, and locomotor activity all showed robust circadian rhythms.