This "pain reduces pain" study looks at how the brain reduces pain when a person feels two painful sensations at the same time. There is considerable evidence that the brain can "turn down" pain using natural endogenous pain-control systems. The current CPM study measures whether attentional processes can also make a measurable contribution to pain inhibition alongside neurochemical mechanisms.
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worst pain ratings of foot only
Timeframe: rated immediately after each thermal stimulus
worst pain on graphic rating scale during test+conditioning stimulus
Timeframe: measured immediately after the stimuli