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- W2076004457 abstract "Under free-running conditions, the grey lesser mouse lemur expresses a circadian activity–rest rhythm with a period particularly short (22.50 ± 0.6 h) for a mammal. Light exerts a strong suppressive effect upon activity. After transfer from nycthemeral to free-running conditions the duration of activity was systematically increased. This extension took place in the first cycle and was characterized by both a phase advance in activity onset and an even larger phase delay in activity offset. This phenomenon was more pronounced after long day entrainment. Any shift of the light–dark cycle was followed the next day by a corresponding shift in activity onset. The phase response curve pattern was similar to that already described for nocturnal mammals. Due to the strength of light as a zeitgeber and the plasticity of the response to photic conditions, the mouse lemur appears as a convenient species for chronobiological studies on non-human primates. En isolement sensoriel et sous lumière rouge permanente (RR), le Microcèbe, prosimien malgache, exprime un ryhtme circadien d'activité-repos de période particulièrement courte (22,50 ± 0,6 h). Chez cette espèce nocturne, la lumière exerce un puissant effet inhibiteur sur l'activité. Par rapport au rythme nycthéméral, le rythme circadien est caractérisé par une extension de la durée d'activité d'autant plus marquée que la photophase du cycle lumineux précédant le RR était longue. Dès le premier cycle RR cette extension se manifeste par une avance du début et un délai de la fin d'activité. Tout décalage horaire du cycle jour–nuit entraîne immédiatement un décalage correspondant de l'activité. Sous RR, l'application d'un pulse de lumière en période d'activité peut entraîner un déphasage de plusieurs heures du rythme au cycle suivant. Ces réponses signent une plasticité adaptative particulière vis-à-vis de la photopériode. Le microcèbe constitue un modèle pour des études de chronobiologie chez les primates." @default.
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- W2076004457 date "1999-09-01" @default.
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- W2076004457 title "Duration of activity and period of circadian activity–rest rhythm in a photoperiod-dependent primate, Microcebus murinus" @default.
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