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Division of attention produces inhibition of pain (mean ± SEM). A, During the stimulus conditions where proximal probes had a high probability (50%) of being activated (35/49°C and 49/49°C), distal pain ratings were significantly reduced relative to single stimuli and to conditions where the proximal probe had a low probability (0%) of being activated (off/49°C). B, Such reduction in pain ratings was not observed at proximal sites.
