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.

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.

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.

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).
References in periodicals archive ?
Wever, "Spontanperiodik des menschen bei ausschluss aller zeitgeber," Naturwissenschaften, vol.
In addition to light, a physician should utilize as many other synchronizers (zeitgebers) as possible to support the circadian rhythm.
A series of methods based on light exposure /deprivation and on the modulation of zeitgeber in the central nervous system were created, all meant to resynchronize internal clocks.
maximus in captivity was predominantly nocturnal, and light seems to be the most important Zeitgeber promoting synchronization of the activity rhythm.
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.
Any drug with significant zeitgeber (chronobiotic) properties would be expected to produce a parametric modulation of free-running period, particularly (as is the case for H.
(9) This internal 'clock' allows each individual Palolo to independently register the exact sequence of lunar cycles which have transpired since the last mating season, thus allowing the worm to perfectly synchronise its moment of detachment with that of all the other worms (according to Aveni, "the dim lunar illumination is the zeitgeber that entrains the animal to a lunar periodicity', 1989:174, but see note 10).
Magnetic field of the Earth as additional Zeitgeber for endogenous rhythms?
Jet lag can be defined as "the condition where the circadian clock is out of step with the environment." (41) The Ames Research Center asserts that crossing time zones produces an additional zeitgeber disruption regularly encountered by flight crews.
The persistence of rhythms in the absence of a dark-light cycle or other exogenous time signal (i.e., a Zeitgeber) clearly seems to indicate the existence of some kind of internal timekeeping mechanism, or biological clock.
It is interesting to note that this detective narrative is a tale of vengeance, one that is perpetrated by all three murder suspects who all have reasons to hate Oswald Zeitgeber. One of these, Madame Quaston, intended to avenge the death of her daughter who, "poursuivie par le vieux debauche, fut contrainte de se jeter a l'eau pour sauvegarder son honneur" (277).