This is because a person generally has less conscious control over these than other signals. Vocal cues can predict deception . Space is important . Personal space is needed and if it is invaded intentionally and at times by oversight can cause an individual to feel uncomfortable or threatened. Studies have shown that individuals that do not respect others space are less popular and often rejected by others.
Gestures communicate .
Hand signals can communicate without the use of any speech. Touching can be friendly or it can be aggressive. The way a person stands reflects their level of confidence and comfort level. When you interact socially develop your listening and observations skills . The above are a guide for looking for the clues to deception they are not full proof.