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Zeitgeber
Zeitgeber: An environmental agent or event that provides the cue for setting or resetting a biological clock. To be synchronized with our environment , we need the input of Zeitgebers. The most important Zeitgeber in nature is light. Social factors, chemical factors and activity can also serve as Zeitgebers. Light is a so-called photic type Zeitgeber, whereas activity, for example, is called a non-photic Zeitgeber for the biological clock.
Zeitgeber comes from the German Zeit, time + Geber, giver = time-giver. The term Zeitgeber was introduced into science about 1954 by Jürgen Aschoff, then the Director of the Max-Planck-Institute in Erling-Andechs, near Munich.
Last updated on 05/15/2008
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