Changes in selective brain cooling across the behavioral states of the ultradian wake-sleep cycle.
In cats, the behavioral state-dependent negative correlation of the pontine-hypothalamic temperature difference, an indicator of selective brain cooling, with the hypothalamic-ear pinna temperature difference, which is an indicator of heat loss from the heat exchangers of the head, is suppressed after bilateral common carotid ligature. Behavioral state-dependent selective brain cooling may underlie a thermal feedback mechanism differentiating the relative influences of hypothalamic and extra-hypothalamic thermoreceptors on the thermoregulatory system during quiet wakefulness and NREM sleep.
Azzaroni
A
A
Department of Human and General Physiology, University of Bologna, Piazza Porta San Donato 2, 40127, Bologna, Italy.
Parmeggiani
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PL
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001831:Body Temperature / Q000502:physiology; D001833:Body Temperature Regulation / Q000502:physiology*; D002339:Carotid Arteries / Q000502:physiology; D002415:Cats; D002940:Circadian Rhythm / Q000502:physiology*; D002941:Circle of Willis / Q000502:physiology; D003080:Cold Temperature; D007031:Hypothalamus / Q000098:blood supply / Q000502:physiology*; D008297:Male; D012895:Sleep, REM / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology*