Fig. 5
From: The suprachiasmatic nucleus: age-related decline in biological rhythms
Reduced MUA rhythms in the SCN of middle-aged mice in vivo. Representative serial-plotted actograms of neural and locomotor activity showing diurnal and circadian rhythms of MUA in the SCN of young (a) and middle-aged (b) mice. Light conditions are indicated at the top of the figure; open bars are light phases, and closed bars are dark. The bottom trace represents simultaneously recorded locomotor activity. The number of spikes for MUA or locomotor activity was counted every minute