This is a great line: "I have too much respect for our brains to buy that "limited brain bandwidth" explanation." I wish more people would subscribe to this. I also like the way R. Douglas Fields tracks down the answer to the question. "(The) connection is borne out by research showing that hand and mouth movements are tightly coordinated. In fact, that interplay often improves performance." In such a case, words literally mirror hand gestures, and vice versa. It seems to me this would make the semantics of such words quite interesting - what does an utterance 'mean' when it's an unconscious reflection of an effort to turn a screwdriver?
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