Abstract
To be of full functional significance for the organism, circadian rhythms have to be synchronized to the 24-h day. This is done by response to periodic signals from the environment, the Zeitgebers (Pittendrigh 1981). The entrained state is characterized by a stable phase angle difference ψ between rhythm and Zeitgeber; sign and amount of ψ depend on the period τ of the rhythm (as measured in constant conditions) and on the period T of the Zeitgeber. Furthermore, circadian systems can be entrained to periods deviating from 24 h only within certain limits (Aschoff and Pohl 1978).
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Aschoff, J., Daan, S., Honma, KI. (1982). Zeitgebers, Entrainment, and Masking: Some Unsettled Questions. In: Aschoff, J., Daan, S., Groos, G.A. (eds) Vertebrate Circadian Systems. Proceedings in Life Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68651-1_2
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DOI: https://doi.org/10.1007/978-3-642-68651-1_2
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