Figure 4. Circadian rhythm of locomotor
activity in SCN lesioned mice. A:
Representative actogram of a mouse that received SCN lesion. B:
A mouse that received a sham lesion. C: The periodogram
analysis (χ2) indicated that the locomotor activity is no longer
rhythmic after the SCN has been lesioned. D: It is still
rhythmic in the sham-lesioned mice.