> If it is possible, maybe it is what some people supposedly feel as "auras"

I've always held two complementary beliefs regarding auras and similar senses:

1. It's plausible that some humans can sense subtle information about things like emotional states or reactions in other humans using non standard sensing mechanisms (so maybe electric fields rather than sight, for example).

2. I'm very certain that for overwhelmingly most humans who claim they can see auras, it's one of: bullshit, fakery, self delusion, wishful thinking, charlatanism, a scam.

Yeah, synesthesia combined with being attuned to body language and emotions could account for lot. I even remember there was some anecdote of a famous physicist (Feynman?) who investigated this soviet mind reader and found that he was picking up on subtle bodily clues.