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. Author manuscript; available in PMC: 2010 Oct 19.
Published in final edited form as: Physiol Behav. 2009 Jul 17;98(4):427–432. doi: 10.1016/j.physbeh.2009.07.007

Fig. 2.

Fig. 2

Representative actograms constructed from motion detector data on mice without running wheels. (A) BALB/cJ mice re-entrain to 6-hr advances of the light-dark cycle within 1–2 circadian cycles in the absence of running wheels, whereas C57BL/6J mice require 7–8 cycles. (B) Large phase advances in activity rhythms are expressed by BALB/cJ mice but not C57BL/6J mice after single-day 6-hr advances of the light-dark cycle followed by release to constant darkness. Shaded areas correspond to lights off. (**, p<.01; ***, p<.001)