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Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
James D. Hardy, Herbert G. Wolff, and Helen Goodell of Cornell University proposed the unit based on their studies of pain during the 1940s-1950s; they defined one dol to equal two "just noticeable differences" (jnd's) in pain. The unit did not come into widespread use and other methods are now used to assess the level of pain experienced by patients.