PET and MRI brain scans were combined to make these images, illustrating activity in the brain’s mu opioid system. On top, study participants were experiencing pain. On the bottom, they thought they were receiving an injection of painkiller medicine that was actually a placebo. Image Courtesy of University of Michigan
PET and MRI brain scans were combined to make these images, illustrating activity in the brain’s mu opioid system. On top, study participants were experiencing pain. On the bottom, they thought they were receiving an injection of painkiller medicine that was actually a placebo. Image Courtesy of University of Michigan