Zeitgeber 2525075 210115689 2008-05-04T15:14:17Z Hordaland 4755260 /* See also */ See also Ultradian, as "Ultradian rhythm" is a red link. '''Zeitgeber''' (from [[German language|German]] for "time giver", synchronizer) is any external (exogenous) cue that [[Entrainment (chronobiology)|entrains]] the internal (endogenous) time-keeping system of organisms. The strongest zeitgeber, for both plants and animals, is light. Other, non-photic, zeitgebers include temperature, social interactions, pharmacological manipulation and eating/drinking patterns. The German term „Zeitgeber“ came into the [[English language]] when [[Jürgen Aschoff]], one of the founders of the field of [[chronobiology]], used it in the 1960s. It is now in common use in the scientific literature in this field. == See also == *[[Phase response curve]] *[[Circadian rhythm]] *[[Infradian rhythm]] *[[Ultradian]] *[[Melatonin]] *[[Suprachiasmatic nucleus]] or nuclei (SCN) == Literature == * Aschoff J (1965) The phase-angle difference in circadian periodicity.In "Circadian Clocks" (J. Aschoff, ed.). North Holland Press, Amsterdam, p 262–278. [[Category:German loanwords]] [[Category:Circadian rhythms]] [[Category:Sleep physiology]] {{biology-stub}} [[de:Zeitgeber]] [[es:Zeitgeber]]