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The evolutions of randomly selected neuronal oscillators in the LP (a) and the SP (b). The asymmetrical degree p = 0.6 and 1 correspond to the LP (long photoperiod) and the SP (short photoperiod) respectively. The mean of the neuronal intrinsic periods τ is 23.5 h, and the period of the external light-dark cycle is 24 h. The gray (white) area corresponds to the darkness (light).
