抄録
A piezo-plethysmograph [1] with calibrating mechanism was devised. With cold stimulus on the palm of a hand, strong vasomotor reflex was observed corresponding to the difference between the skin temperature and the temperature of stimulus. When the process of giving light stimulus 30 seconds before a cold one was repeated 29 times, vasomotor reflex was caused by light stimulus alone.
Visible rays as well as infra-red rays exerted influence on vasomotor reflex.
The wind had some more effect on vasomotor reflex other than physical cooling effect, and a strong reflex was recognized with the wind blowing notwithstanding an over-coat and a scarf worn.
The reflex ceased soon after the wind blew out. The width of landscape had a strong effect on vasomotor reflex. The velocity of the change of volume in the finger was expressed as an index of vasomotor reflex.
