Figure 1
Light-dark cycle synchronization of circadian rhythms in blind primates. Shown are representative double-plotted motor activity records of a blind marmoset during photoentrainment, advance and delay of light phase, and free-run in constant light condition (LL). Time is indicated at the bottom, day at left side, and the light-dark cycle (LD) or LL on the right side. The boxes represent the light phase of the LD cycle.
Figure 2
Circadian pattern of motor activity in blind and normal marmoset. (A) Representative double-plotted motor activity of a blind (left) and a normal (right) animal. (B) Wave form plot of activity of blind (left) and normal (right) marmoset. Both animals showed a bimodal pattern of activity, but this bimodal pattern was less prominent in the blind animal, which showed a shorter active phase compared to the normal animal. (C) Periodogram of activity rhythms for blind (left) and normal (right) marmoset in the LD cycle. (D) Entrainment of the blind marmoset after the time of lights-on was delayed by 6 hours. (E) Entrainment of the sighted marmoset after the time of lights-on was delayed by 6 hours.