David Cameron is a very good speaker with a similar level of nonverbal skills. He does at times though tend to use the "Vertical Hand Chop" excessively (and its variations). This is in part due to his tendency to speak in a rapid, staccato style - as if he were a barrister on the attack in court (but certainly not in all court matters) - or during particularly vigorous defense of an idea before Parliament. In such scenarios this may at times be very beneficial. In other contexts however, his speeches are more effective and he builds more rapport when he slows down and use a bit less alpha (sometimes hyper-alpha), and over-repetition of this hand chop.
Here Mr. Cameron is chopping rapidly. Using this gesture with a higher speed increases its alpha and conversely, slowing it down increases the beta. Any leader should always contextualize the nonverbal with the verbal and the relative importance of the subtopic within the speech as a whole. Speeches have many of the characteristics of a good song. They have a crescendo & decrescendo qualities, verses, speed changes, etc. and all nonverbals should match the desired effect.
In this photo Mr. Cameron uses the hand chop with open - fingers. This configuration makes it less alpha and more beta.
Increased tension in the hands is highly correlative with increased facial tension. Compare the U.K. leader's face and hand (high tension) in this image to that immediately above - where both are much less tense. This increased tension is consistent with more anger and increased relative priority with what is being discussed verbally (which of course is not always evident when only listening to the words). Such patterns are not only seen in political speeches - but are seen repeatedly evident in sales, court, mediation or negotiations.
Note again the contrast of the tension on the P.M.'s face here compared to when his palm is more up-turned.
Here his palm-partially oriented down and his twisting of his hand & wrist act as a visual nonverbal metaphor for the "unlocking" of which he speaks (a body language analog of an onomatopoeia). This configuration again also conveys the relative importance he feels about this subject and his/U.K.s role in it.
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