Very much what [MENTION=14825]bellisima[/MENTION] said and it all depends on the situation though and I don't do it intentionally, if I do I make mistakes, but I notice body language, eye movements, micro expressions, voice inflection, placement of feet, hand movements, an overuse of details, omission of details, whether they are moving naturally with a comfortable, fluid flow or whether they are fluid like a robot (ie forced, unnatural movements) and it is only after making these observations without any real intent that I can begin to piece it all together intentionally for a complete picture, sometimes, I do it quickly, other times it may take some time, but if I start with the intention of reading someone I end up projecting onto them and make false assumptions, also I did not use one period in this post I truly hope there are no grammar Nazi's that see this!