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1 Psychological Laboratories, Harvard University, Cambridge, Massachusetts
Thresholds for pricking pain, as well as withdrawal points and endurance limens, were measured in 40 untrained subjects. The measurements were made in terms of the instantaneous temperature of the skin during thermal irradiation. The thresholds were lower and more variable for these subjects than for highly trained ones. They varied with the region of skin stimulated, ranging from 40.8°C on the palm to 42.2°C on the forehead, and were about 1°C higher on skin blackened with India ink than on normal skin. Adaptation to pain occurred regularly, sensitivity being decreased in repeated measurements. Implications for pain threshold measurements in general are discussed.
Submitted on March 31, 1958
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