When we participate in a meeting, our brain registers much more than just the spoken conversation. Next to verbal expressions, a good, often significant part of the communication happens in nonverbal manner. We have learnt to draw conclusions from the body language of our counterparts, their facial expression, posture, gestures or the signals sent through mere eye-contact. We decode a smile and flushing cheeks, the tone and volume of voice and plenty of other signals, through which we "read" others. In a meeting, everybody communicates, even without saying a single word.