Gestures must be symmetrical. When people are speaking and they make movements on their body their speech and body movements need to be congruent. It is the same with gestures. If someone responds to a question with a shoulder shrug then it should happen on both shoulders.
Deception Tip 16: Beware of asymmetrical gestures, as truthful expressions are symmetrical. Shoulder shrugs more prominent on one side may be indicative of deception.
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E16 - Symmetrical Gestures - Deception Tips Podcast