The researchers gave each of 24 participants an fMRI scan, which measures blood flow in the brain. They tracked the participants’ brain activity as a small portion of their forearm was exposed to heat, which was either painful (quite hot) or not painful (pleasantly warm). A computer algorithm then analyzed the data for patterns, looking for types of brain activity that occurred in response to painful or not painful heat.
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Brain Scans Suggest a New, Objective Way to Measure Pain | 80beats