Expectancy, redefinition and reported pain

Three groups of subjects were administered a redefinition strategy which asked them to focus on sensations during noxious stimulation. Those in one group were informed that the strategy would reduce pain (positive expectancy), those in a second were informed that it would augment pain (negative expectancy), and those in a third were given no information on expectancy. Subjects in a fourth group received neither redefinition nor instructions on expectancy. The four groups did not differ either in expectancy of pain reduction or in reduction of reported pain. Subjects in all groups expected more pain than they reported, and expectations for pain reduction showed only a small correlation with degree of reported pain reduction. In all groups, men reported less pain than women.