The term biological clock is used to designate the phenomenon, displayed by organisms, of pacing activity in a cyclic manner related to environment. Many nocturnal animals, for example, are capable of entraining the onset of their activity with the light-to- dark transition in a periodic light-dark regime in which the period or ratio of light to darkness varies widely. This paper presents the development of an electronic model for simulation of the adaptation of the endogenous circadian rhythm of nocturnal ani mals due to light stimuli.
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