Loss of eye movements abolishes light entrainment of circadian mesolimbic catecholamine excitability: A function for REM? |
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Authors: | Janice R Stevens Arthur A Livermore Jack Fellman |
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Institution: | University of Oregon Health Sciences Center Portland, Oregon 97201, USA |
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Abstract: | Light entrainment of the circadian rhythm of mesolimbic dopamine excitability, measured by the amphetamine-induced locomotor response, and the circadian feeding rhythm was abolished following section of the extraocular muscles of the rat. Endogenous (free-running) circadian rhythms were preserved. The results are consistent with electrophysiologic evidence that the rapid eye movements during paradoxical sleep transmit light-modulated electrical potentials to regions of the brain that influence circadian rhytms and dopamine release. |
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