Body language of nervousness and speaking
First off many people are not comfortable speaking in front of crowds or even groups of one two people let alone a full room so an adventure in speaking brings out the nervousness even for successful leaders. One of the “tells” that you may pick up on is the way that the man or the woman walks to their spot to speak or their pulpit. You may see a lack of confidence or possibly even a slow long walk to where they need to be. For someone who is confident it just seems like they should be there, they have a good stride, they show confidence and they just seem comfortable wherever they are.
As you watch for the nonverbal cues of nervousness you will see than hands shake or even a look of being lost. You may see signs of lack of confidence with the walk or just while the man or the woman is standing there. Many times the man or the woman will focus in on one or two people that they may think are “safe” and it makes the situation awkward or dilutes the message that is being delivered.
If there is a pulpit for the person to stand behind there may be a “death grip” on the edges and the whole speech or talk and the person may learn in. While a woman or a man is behind a pulpit they may just look down at their notes and not even look up at the people that they are addressing.
Body language of lies and or deceit while speaking
While you watch the man or the woman giving a presentation there are signs and signals that you may observe while they present that will give you clues to if they are telling the truth or not.
Since you have base lined the speaker you will be able to tell what is a normal or routine action for them or if their touch is out of the ordinary. You will also want to look for a mismatch where they may say that like something but their head shakes no like they were answering a question silently.