A couple of years ago I read a book called Phantom in the Brain by VS Ramachandrin. I named one of my characters in my novel after him. Anyway, I don't expect anyone to read the book but here's a documentary about his work.
Part 1. Part 2. Part 3. Part 4. Part 5. Part 6. Part 7. Part 8. Part 9. Part 10.
What he's documented is that the will, feelings, thoughts, language, and even consciousness (awareness) are just aspects of the brain.