Four adult human subjects were tested under 3 conditions of internal body temperature: hypothermia, normal and hyperthermia. Under each of these conditons, they judged the intensity (degree of warmness or coolness) and the hedonic quality (degree of pleasantness or unpleasantness) of a series of stimuli ranging from hot to cold. Whereas hedonic quality if greatly influenced by the value of internal body temperature, the perception of warmness or coolness is independent of internal temperature and dependent only on peripheral stimulation.