Before revision: Not only have Siri Leknes and Irene Tracey, two leading neuroscientists in the study of pain and pleasure, concluded that pain and reward processing involve many of the same regions of the brain, but also that the functional relationship lies in that pain decreases pleasure and rewards increase analgesia, which is the relief from pain.
After revision: Not only have Siri Leknes and Irene Tracey, two neuroscientists who study pain and pleasure, concluded that pain and reward processing involve many of the same regions of the brain, but also that the functional relationship lies in that pain decreases pleasure and rewards increase analgesia, which is the relief from pain.