Erckens W, Weber F
Experientia. 1976 Oct 15;32(10):1297-9. doi: 10.1007/BF01953103.
Rudiments of an ability for endogenous time-measuring are indicated a) by bimodal activity in the dark phase of LD-cycles of 16:16 or 24:24 h and b) by damped activity oscillations frequently following a transition from LD to constant conditions. These oscillations always have the same period length as the applied LD.
a) 在16:16或24:24小时的明暗周期的黑暗阶段出现双峰活动;b) 在从明暗周期转变为恒定条件后,经常出现衰减的活动振荡。这些振荡的周期长度总是与所施加的明暗周期相同。