Gavin deBecker has written two very powerful books about what we call "intuition" or "gut feeling." He believes that's what we call the brain's subconscious processes of observing and analyzing observations. He believes that when we trust those "gut feelings" we are better at keeping ourselves safe.
"Protecting the Gift" is the title of one of the books, I don't remember the other one. My ex threw my copy out because he said it was ******** that I shouldn't read... which made it clear that it was useful reading.