zeitgeber

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zeitgeber

(tsīt′gĕb′ər, zīt′-)
n.
An external stimulus or cue, such as daylight or a regularly repeated occurrence, that serves to regulate an organism's biological clock.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

zeitgeber

A factor in the environment that has periodicity and is capable of synchronising the endogenous circadian rhythm into a 24-hour cycle. Without zeitgebers, the free-running human clock has long been believed to be about 25.3 hours; more recent work by Charles A. Czeisler MD, PhD, pegs the internal human clock at 24 hours and 11 minutes, ±16 minutes.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

zeitgeber

Zeit, German, time, geber, keeper A factor in the environment with a periodicity, capable of synchronizing the endogenous circadian rhythm into a 24-hr cycle; without zeitgebers, the free-running human clock is 25.3 hrs. See Circadian rhythm, Jet lag, Shift work, Sleep disorders. Cf REM sleep.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

zeitgeber

(tsīt′gā″bĕr, zīt′) [Ger. Zeitgeber, timekeeper]
Any of the mechanisms in nature that keep internal biological clocks synchronized (entrained) with the environment. Zeitgebers can be physical, involving light or temperature (e.g., sunrise, sunset), or social, involving regular activities (e.g., consistent mealtimes).
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
These groundbreaking studies, which are discussed in the section below, helped reorient the prevailing entrainment paradigm for humans and restored light to its rightful place atop all circadian zeitgebers. In the clinical realm, these studies also prompted the psychiatry field to take a closer look at a newly emerging tool whose utility was being explored for the treatment of mood disorders.
In addition to light, a physician should utilize as many other synchronizers (zeitgebers) as possible to support the circadian rhythm.
In addition to the environmental Zeitgebers, humans are influenced by social markers.
Besides biological effects, social zeitgebers could significantly influence on M/E (Roenneberg et al., 2003).
Long-distance air travel also disrupts zeitgebers, environmental cues that induce adjustments in the internal body clock.
The circadian system is acutely sensitive to environmental photic cues, with natural light being one of the universal and predominant environmental time cues, or zeitgebers. The suprachiasmatic nucleus (SCN) within the hypothalamus regulates the body's circadian system and has been established as the master circadian pacemaker or master clock.
However, it is modulated by social and environmental zeitgebers. Several factors have been identified that influence morningness, for example age, gender and evidence for a genetic basis has been found recently (Hur, Bouchard, & Lykken, 1998).
Frank said based on her clinical experience--she has been following some patients for 10-12 years--people with bipolar disorder are vulnerable to disruptions in their social zeitgebers throughout life.
Frank said based upon her clinical experience, individuals with bipolar disorder remain vulnerable to disruptions in their social zeitgebers throughout life.
The light-dark cycle is the most important zeitgeber or time-cue for resetting the sleep/wake rhythm to the 24-hour day, with other environmental cues such as regular social interactions and meals acting as secondary zeitgebers.