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Any list of the world's top ten most famous paintings will surely include da Vinci's Mona Lisa. Part of the painting's appeal is its mystery. 在任何世界名画前十名的列表中，一定都会有达芬奇的“蒙娜丽莎”。其吸引力部分来自于它的神秘。 Those lucky enough to have an unobstructed view of the Mona Lisa at the Louvre often stare in awe, baffled by the smile that seems to flicker and fade. Gazing at a reproduction of the work produces the same effect. Now she's smiling, now she's not. 那些有幸可以在卢浮宫自由欣赏蒙娜丽莎的人们眼神中常常都充满了敬畏，他们也对蒙娜丽莎那看似一闪即逝的微笑也感到困惑。即使看它的复制品也会产生同样的效果——似笑非笑。 What's the deal with Mona Lisa's smile? 蒙娜丽莎的微笑是怎么回事呢？ Harvard neuroscientist Margaret Livingstone is pretty sure she's solved the puzzle. Presuming nothing, Livingstone reasoned that the famous portrait's flickering smile is caused by the way we see. 哈佛大学的神经科学家Margaret Livingstone很确信自己已经解开了这个疑惑。其实没什么其它原因，Livingstone将蒙娜丽莎这个著名画像的如闪即逝的微笑的原因归为我们看它的方式。 Our eyes use two separate regions to see. One is the fovea, a central area used to see colors and pick out details such as fine print. The area around the fovea is better at detecting motion, shadows, and stark, black and white contrasts. | 
