Functional absence of extraocular photoreception in hamster circadian rhythm entrainment

The mammalian circadian pacemaker is entrainable by light via the retina. The putative role of extraocular light perception was investigated in blinded hamsters. These animals were shaved and exposed to a light-emitting pad for either 30 min or 3 h. The absence of any phase-shifting effects on wheel...

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Veröffentlicht in:	Brain research 1999-06, Vol.831 (1), p.337-339
Hauptverfasser:	Meijer, Johanna H., Thio, Bing, Albus, Henk, Schaap, Jeroen, Ruijs, Aleid C.J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals Biological and medical sciences Blindness - physiopathology Circadian rhythm Circadian Rhythm - physiology Cricetinae Cryptochrome Extraocular light perception Fundamental and applied biological sciences. Psychology Mesocricetus auratus Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration Photic entrainment Photic Stimulation Photoreceptor Cells, Vertebrate - physiology Skin - radiation effects Space life sciences Suprachiasmatic nucleus Vertebrates: nervous system and sense organs Visual Perception - physiology Visual system
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Zusammenfassung:	The mammalian circadian pacemaker is entrainable by light via the retina. The putative role of extraocular light perception was investigated in blinded hamsters. These animals were shaved and exposed to a light-emitting pad for either 30 min or 3 h. The absence of any phase-shifting effects on wheel running activity rhythms indicates that extraocular light perception plays no functional role in photic entrainment of the circadian pacemaker in the hamster.
ISSN:	0006-8993 1872-6240
DOI:	10.1016/S0006-8993(99)01509-7