Did you know that there is a whole study devoted to the subject of body language? Undoubtedly there is also great debate on the subject, whether or not you can rely on what you see as a negative or positive signal. Under general circumstances one cannot take anything for granted but there are times when body language tells all.
In the case of a dramatic event the way people react is very telling. Additionally there is no question that when people are interested in something their body gestures change. If your buddy turns to you and say's, Look at that beautiful woman, you don't just stay slouched back in your seat, you immediately sit up and look to find her.
As people when we are interested in something we sit up and pay attention, and this is true no matter who you are, if you want to hear what is being said you move closer to listen. The reason you want to hear is because you are interested in what is being said and you want to find out more.
Watch this for yourself in various environments; you will see what I am talking about if you don't already understand what I mean. After all I could be some cuckoo, so you should find out for yourself.
So reactions are actually more telling over that of general posture. A woman may have her arms folded while talking to you or with her friends, which does not necessarily mean she is disinterested, this may be her general comfortable posture. We as humans have a tendency to be protective of ourselves, so we naturally can be weary in unfamiliar territories or with people we do not know.
On the other hand reactions are more true to the moment. If you walk by a girls and she reacts by stopping her conversation and glancing at you, then she is interested.
In conclusion observe your own body language and that of those around you, pick up on the subtle reactive signals and soon enough you will begin to understand what means what.
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