It is also conceivable that Trump's exaggerated mouth movements are simply another example of a generalised strategy that involves using "supernormal stimuli" to attract attention to himself. Recent research on humans suggests that, like birds and fish, we too have an innate orienting reflex to supernormal stimuli, and that we respond more powerfully to things that are larger-than-life, whether in the realm of luxury goods, food or sex. Maybe Trump's mouth movements - together with his histrionic hand gestures and overstated opinions - are all unknowingly designed to capitalise on this human reaction.

特朗普夸张的嘴型也可能是一种广义上的战术，即用“超常刺激”来博取人们的注意力。近日一项人类研究显示，与鸟、鱼一样，人类对于奢侈品、食物、性等方面的“超常刺激”也具有天生的定向反射，对于惹人注目的事物反应更加强烈。也许特朗普的嘴型及其做作的手势和夸张的言辞都在不知不觉间利用了人类的自然反应。

So which facial expressions will Trump opt for during his inauguration? Will he try to present himself as a tough guy by putting on his alpha face and jutting out his chin, or will he embrace everyone with a big smile, or possibly even a zipped smile, with or without a puckered chin? Whatever happens, Trump's face is sure to provide important clues about his attitude to the occasion and what is going through his mind. Having chosen to be everyone's face, there's really nowhere for him to hide.

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