Great episode! Who is the author/and the study Dr. Mackey is citing related the pain stimulus distal inhibiting the primary pain stimulus?

Sean Mackey mentioned a study by Labar in the late seventies on rodents, which explored the phenomenon of distal pain stimuli inhibiting the primary pain stimulus. This process activates a brain stem circuit with descending pathways to the spinal cord, effectively inhibiting pain. This phenomenon, termed diffuse noxious inhibitory control (DNIC), is matched in humans as conditioned pain modulation (CPM) 1.