Body language is something that we all understand unconsciously, but rarely take much notice of; unless it is strikingly obvious in some way. Over the last thirty years or so a lot of research has been done into the hidden language of non-verbal communication and we now know that our every thought and feeling is in some way communicated through our central nervous system to our body. This communication manifests itself through our physiology or bodily responses to the world outside of our internal thoughts and feelings and shines for all to see. Fortunately, few people are sufficiently well versed in the secret signs, symbols and messages of this non-verbal process, which means that our own individual inner hopes and fears, thoughts and feelings remain relatively safe from the prying eyes of those who would love to know and understand them.
However, we all share something in common when it comes to body language and it is for this reason that we do have, albeit underdeveloped in most people, a natural instinct for reading the body signals of others. That commonality comes from our own culture in which we all share similar body gestures and movements that correspond to what we think and feel. In all cultures people within them use their body in the same way to express culturally learned non-verbal communication. This means that when your body receives messages from your brain regarding certain things like self-consciousness, embarrassment, attraction, excitement, doubt and fear, it will make the same or similar gestures and movements as everyone else would in a similar mental or emotional state. Simply by living out our lives within our own culture we naturally learn and display those cultural non-verbal traits. As a simply example, we never need to tell someone which side to walk past us and we tend always to greet new people with a hand shake and a moderate smile.