When we consciously or unconsciously make that decision, we snuff out that little voice in our head.

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When done consciously, followers of NLP call this matching.

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The girl beside him cracked a trace of a smile too, but looked away self-consciously when she saw me notice.

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Yet we miss some of the most powerful means of persuasion humans have when we don't consciously use nonverbal gestures to support our arguments.

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