Abstract
1. 1. The hypothalami of golden-mantled ground squirrels at various stages of hibernation were heated and cooled while rates of heat production and loss were continuously monitored. 2. 2. The hypothalamus of the euthermic squirrel between bouts of torpor is extremely sensitive to temperature displacement and activates thermoregulatory mechanisms with little or no negative feedback from extrahypothalamic core or peripheral receptors. 3. 3. During deep hibernation the CNS regulator of body temperature is inactive. 4. 4. Low temperatures which induce arousals are sensed in the brain but probably not in the hypothalamus. 5. 5. Arousals involve a rapid re-activation of the hypothalamic temperature regulator and a rapid rise in the set point for body temperature to the euthermic level.
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