Head over heart - but
The time spent practising, reading, watching is all aimed at fine tuning and adding focus to the brain. It has to be considered the best weapon in this game. That being said, I have noticed, come to recognize, the “feeling”.
It’s not something you can force or guess at. It has to just happen. The initial look at your hole cards and you get that feeling “I need to play this hand”. Tracking when I recognize it, my hand hits around 80% of the time. That doesn’t mean I win them all tho as my opponent can hit and be better a well.