By Stephen Cheney
The human body has sensors all continually inputting to the brain. But those impulses are also competing for the brain's attention. The brain sometimes shuts some inputs off in order to focus on those that it wants. When a friend is talking you may focus on that and exclude hearing a door opening. When a friend is nagging you, you may not register what is said, your mind listening to the remarkably interesting calls of birds far in the distance. When you are communicating with someone while they are observable by you, you register their body language somewhat subconsciously. You don't have to know why or how, just register impressions overall. This subtle sensing feeds information of meaning to the brain and assists you to make judgements that may turn out to be correct even though you may not be able to explain why.