We examined the relationship between a humid stimulus and humid senses such as sticky and wetting sensations. It becomes clear that a humid sense did a constant change to the stimulus like temperature and pressure sensations. It was found that the change of humid sense evaluated by the power law of Stevens was more linear than by the law of Weber-Fechner. Moreover, a constant relation was observed between the exponents of humid sense for the power law of Stevens and the vapor pressure of the environment. It was suggested that the humidity sense changed with the environment humidity, and was more correlated to the vapor pressure of the environment than the relative humidity of the environment.
The effects of skin coolingon the regional differences of thermoregulatory responses wearing a water-perfused suit ware studies. A women subject was kept in the rest supine posture in a climatic chamber of temperature of 30.0±0.5°C, relative humidity of 50±3% and air velocity of 0.2m/sec. The tests were repeated three times under the same experimental conditions. The temperature set at a suit was maintained at 33°C for 30 min., then lowered to 24°C by every 3°C for every 30mins. On torso, the change in thermal sensation at a given decreased skin temperature was greater, but the change in skin blood flow at a given dcreased skin temperature was smaller than that on extremities. These results suggest that the degree of variation in thermal sensitivity and in skin blood flow against lowering skin temperature were greatly different from the sites of trunk and extremities.