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. 2012 Oct 9;7(10):e46843. doi: 10.1371/journal.pone.0046843

Figure 4. Locomotor periodicity persists in individual N. vectensis exposed to constant darkness.

Figure 4

A and C) Locomotor activity of individual animals over the course of 4 days. On day 1, animals were maintained on a 12 hr: 12 hr LD photoperiod and released to constant darkness for days 2–4 of the experiment. B and D) FFT analysis was conducted on raw activity data during the DD days for each individual. B) An example of an animal with a prominent circadian component showing a period of approximately 24 hours. D) An example of an animal with a primary frequency component of approximately 12 hours. This component is not seen on Day 1 when the animal is in LD (only a nocturnal peak is evident), but emerges as the animal is transferred to constant darkness.