Unimodal and bimodal behavior patterns in animals housed in 12 hr light: 12 hr dark (LD).

<p>24-hr profile of locomotor behavior in individual <i>N. vectensis</i> showing A) unimodal or B) bimodal patterns of activity. Dark bars indicate lights off and white bars indicate lights on. The red line indicates a calculated moving average of 10 bins. C) 24 hr profile of locomotor behavior averaged from 18 animals (group data) showing unimodal pattern of activity. D, E) FFT analysis of the same individuals showing a strong frequency component at approximately 24 hours. E) Example of FFT analysis from an individual showing a prominent bimodal pattern of activity with a higher frequency peak at approximately 11 hours. F) FFT analysis of group data showing a strong frequency component at approximately 24 hours. All FFT analyses were conducted on raw data over the 4 days in LD.