Figure 1
From: Light-dark cycle synchronization of circadian rhythm in blind primates
![Figure 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1740-3391-3-10/MediaObjects/12973_2005_Article_18_Fig1_HTML.jpg)
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.