|Self Development : Interpreting Body Language|
It may sound odd, but often you can tell how far someone is engaged - or not - in a conversation through the state of the eyes.
The reason for this is that, when interested, the pupils often get larger and in contrast when they are dis-interested, they sometimes get smaller.
So, if you want to see if someone's body language is showing interest or dis-interest then why not take a look at the eyes.
Of course the eyes of everyone vary so you will need to know someone fairly well to get used to detecting subtle changes before using this method of reading their thoughts and feelings.
Questions about body language: