Generally a large part of the message in human communication is being transmitted nonverbally, through those non-verbal forms. Most of the described components are culturally and situationally dependent and therefore not easy to interpret - with the exception of facial expressions - see FACS (Facial Action Coding System) and the Six Basic Emotions. Using non-verbal communication sometimes we replace and sometimes we support or emphasize our verbal communication. It is a human nature that by nonverbal communication we express emotions. During normal communication, where the emphasis is on communicating facts or logical information is a nonverbal communication around 30% while when we expressing emotional content it can be up to 90% of the message.

What does perception have to do with communication?