UV-A. Cryptochromes entrain the circadian clock to light. These include personal relationships, social demands, or life tasks that entrain circadian rhythms. The technique involves using sound waves to entrain brain waves. The resulting "Drosophila" exhibits arrhythmic activity and cannot entrain to any light-dark cycle. Regiment left Somme-Bionne Oct. 11, 1918 to entrain for Vignemont. Infants have a natural tendency to entrain to the sounds that surround them. This indicated that some blind humans can entrain to light through non-visual photoreceptors (2007). As glaciers move over their beds, they entrain and move material of all sizes. Meanwhile, mice with eyes removed could not entrain to light.