The behavioral state-dependent changes in the hypothalamic temperature of homeotherms reflect extracerebral adjustments in circulatory variables to influence the temperature and flow of the arterial blood cooling the brain. There are different mechanisms for brain cooling, i.e. systemic and selective brain cooling, which are affected by the changes in body posture and vasoconstrictor sympathetic outflow related to wake-sleep behavioral states.
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Pier Luigi Parmeggiani (1995) studied this question.
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