Took me a bit of skimming + reading to get to it, but section 3 about causes (and blocking) of intrinsic motivation reflect what you'll find in Daniel H. Pink's book, Drive.
It's been quite a few years since I read it, but I did read it which is more than I can say for some of the non-fiction on my shelves. While I liked it, I can't remember how helpful or impactful it was to read it.
https://www.danpink.com/books/drive/
Presumably built off the same research.