Zeitgeber (from German for "time giver") is any environmental cue that keeps circadian rhythms entrained by resetting the internal clocks that generate endogenous rhythms. Zeitgebers include light, food, noise, social interactions, and alarm clocks.

See also

Literature

• Aschoff J (1965) The phase-angle difference in circadian periodicity.In "Circadian Clocks" (J. Aschoff eds.). North Holland Press, Amsterdam, p 262–278

German loanwords

Zeitgeber