Telling a lie causes a tingling sensation in the delicate facial and neck tissues and a rub or scratch, is required to satisfy it. This is why some people use collar pull gesture, when they tell a lie and suspect that they have been caught out. It is also used when a person is feeling angry or frustrated and needs to pull the collar away from his neck in an attempt to let the cool air circulate around it.
Neck Scratch
The index finger of the writing hand scratches below the earlobe, or may even scratch the side of the neck. This gesture is a signal of doubt or uncertainty and is a characteristic of the person who says, 'I'm not sure'.
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