A lot of people study it. I’m blanking on exactly the book, but Robert Sapolsky writes quite a bit about it. Might be in Why Zebras Don’t Get Ulcers. IIRC ther

A lot of people study it. I’m blanking on exactly the book, but Robert Sapolsky writes quite a bit about it. Might be in Why Zebras Don’t Get Ulcers. IIRC there are different kinds of placebo effects. One of the most robust is pain relief. I think Sapolsky makes the case that endorphins (“endogenous morphines”) do some of the leg work here, but that’s probably not the whole story.