The brain seems to track low-level, statistical behavior

In other words, the brain seems to be tracking low-level, statistical properties of behavior in order to make complex decisions regarding other people's character.It needs to decide is this person's behavior typical or is it out of the ordinary?In the situation with the obnoxious-football-fan-turned-good-samaritan,your brain says,Well, in my experience,pretty much anyone would lend someone their umbrella,but the way this guy acted at the football game,that was unusual.And so, you decide to go with your first impression.