zeitgeber

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zeitgeber

(tsīt′gĕb′ər, zīt′-)

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).

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Unlike them, the melatonin agonist agomelatine--approved in the European Union--has additional antidepressant properties provided by its serotonergic component, besides its role of Zeitgeber in sleep regulation (19, 26).

Chronobiology perspectives in psychiatry/Perspective ale cronobiologiei in psihiatrie

Cette composante du traitement vise le developpement de strategies pour etablir des Zeitgeber sociaux reguliers et stabilisateurs des rythmes biologiques, et la protection contre l'impact negatif des zeitstorer destabilisants.

Psychotherapie interpersonnelle et des rythmes sociaux (PTIRS) dans le trouble bipolaire II: structure du traitement et exemples cliniques

Bright light therapy was unsuccessful for one child, and the other three children were treated using forced waking and regular daytime schedules and night routines that acted as zeitgebers.

Behavioral approaches to the treatment of sleep problems in children with developmental disorders: what is the state of the art?

For circadian rhythms in larval release, the light/dark cycle serves as the Zeitgeber (e.

Circadian rhythm in larval release by the crab rhithropanopeus harrisii: Entrainment model

3rd: Zeitgebers (events in nature that tell the time of year) for this week include occasional sightings of foxes and coyotes frolicking at night in their mating rituals, starlings and sparrows scouting for nesting areas in and around your eaves.

Poor Will's Countryside Almanack for Deep Winter, Late Winter & Early Spring 2010

One possibility is that in bays and estuaries, characterized by turbid water that limits the penetration of light, light levels fluctuate with each tide and thus provide a redundant tidal zeitgeber.

Rhythms of locomotion expressed by Limulus polyphemus, the American horseshoe crab: II. Relationship to circadian rhythms of visual sensitivity

6), indicating that the LD cycle is capable of synchronizing the time of larval release and acts as a natural zeitgeber for entraining the circadian rhythm in larval release by E.

Larval release rhythm of the mole crab Emerita talpoida (Say)

virens, the response is interpreted as being an adjustment to the new photoperiodic cue, or Zeitgeber, where the observed inactivity at the expected dawn is evidence for transient behavior prior to attaining a steady state in the following scotophases.

Interaction between photoperiod and an endogenous seasonal factor in influencing the diel locomotor activity of the benthic polychaete Nereis virens Sars

Hydrostatic pressure fluctuations do not entrain an 'endogenous' rhythm, but since they coincide with the tidal cycles in the field, they could be the zeitgeber of the tidal rhythm.

The tidal rhythm of emergence, and the seasonal variation of this synchrony, in an intertidal midge

The anterolateral arteries are often subject to periodic cycles of hemolymph flow without any apparent zeitgeber in C.

The FMRfamide-related peptides F1 and F2 alter hemolymph distribution and cardiac output in the crab cancer magister

1: Zeitgebers for this week include woodcocks arriving from the South, cardinals singing near 6:30 a.

Poor Will's Countryside almanack for early spring and middle spring of 2010

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.