Psychology of body language

   
   In their book Social Psychology: Understanding Human Action, psychologists Robert A. Baron and Donn Byrne explain: "Information (about other people's behavior) is often provided by 'nonverbal cues' relating to others' facial expressions, eye contact, and body posture... Our current moods or emotions are often reflected in posture, position and movement of our bodies. Such nonverbal cues are usually termed body language."  

   In our everyday communication we all use our body language. Starting with walk, body position and completing with our countenance. All this factors indicates our feelings, emotions etc. Considering on the gestures of the person we can understand him even better
than considering  on his verbal intercourse.

    Understanding of the body language is useful in many situations. By understanding the signs we can change our behavior towards the person. For instance, individuals' hand movements - especially vertical one - can indicate a positive interpersonal relationship. Open and wide
shoulders mean "I would like to meet new people". Standing with hands on hips - readiness, aggression. Brisk, erect walk indicates confidence etc.

   It is important remember that some of us are not able to use verbal language at all. So in their 
case body language plays a huge role. So we should keep in mind that even without words we can
be complete.
   
   The main thing in understanding nonverbal behavior is to distinguish the main differences between the signs. When you distinguish the main signs you can use your knowledge and interpret the all 
behavior of the person. 

http://www.lifepositive.com/mind/psychology/body-language/body-gestures.asp