It's interesting you used the word 'feeling' because unfortunately the English language uses the word synonymously with emotions. Whereas we both know in this c

It's interesting you used the word 'feeling' because unfortunately the English language uses the word synonymously with emotions. Whereas we both know in this context that you meant a thing that you 'can't quite put your finger on'. I have a theory that these feelings are more tied to the primitive parts of our brains/bodies. Especially if something causes danger/stress/exertion. I liken it to a hunter going through a jungle and they experience a dangerous/stressful experience, the brain puts a bookmark for all of the environmental stimuli that are present at that time/place. So when the same stimuli are experienced again the quick, primitive part can say "something isn't right, no time to explain!"