A real happiness smile, what's known as a Duchenne smile, after a neurophysiologist who studied it, involves moving the eyes.

真正开心的微笑是杜乡式微笑，在一个神经心理学者研究后发现，包括眨眼睛。

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Dr Baxendale, who is a neurophysiologist, has looked into some of the scientific evidence and this has not reduced his concerns.

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The neurophysiologist, who is based at Manchester Royal Infirmary, has developed an electrocardiogram system used in heart monitoring to spot early signs of the disease.

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