Have you ever had a gut feeling that someone who seemed nice was actually horrible? And has it ever been correct? We have two ways of assessing people (apparently). There is the initial, non-verbal, ‘gut’ reaction, and then there is the rational assessment which follows. Often the two conflict. So you might have a negative gut reaction, but then find your mind saying “no, hang on, give her a chance, she’s probably nice.”
For example, my sister took her dog for a walk shortly after moving to a new area. A guy in his 60s came jogging past and stopped to say hello. He was super friendly and smiley and nice, but she said he made her skin crawl. In spite of the gushing welcome and nice manners there was something ‘off’. She later found out that he was a convicted paedophile. How do we do it? What is it we pick up on? Is it something in the body language or the tone of voice or what?