Abstract
Nine healthy subjects received noxious cold stimulations at 20.degree., 15.degree., 10.degree., 5.degree. and 0.degree. C on the thenar eminence of both hands. Each stimulus lasted 30 s. At the end of the stimulus, subject estimated pain intensity on a scale graduated from 0 (no pain) to 10 (intolerable pain). The results showed that the intensity of cold pain and that of the stimulus are linearly correlated (Spearman test P < 0.001). Cold pain obeys Stevens'' law with an exponent equal to 1.