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One appeal of the most famous painting in the world that is able to look radiant, but then turned into a serious and cynical.
Now scientists claim to have found the answer to these changes, namely our eyes that sends random signals to the brain.
They believe that the Mona Lisa's smile can be seen depending on the cells in the retina and what channels to use the image into the brain.
Different cells within the eye is designed to take a variety of colors, contrast, background and background front.
All depends on what cells first captures the image and what channel is used to interpret the brain. These channels codify the data based on object size, clarity, brightness and location of the visual field.
"Sometimes one wins over another channel, and senuyum visible, but if others take over, the smile will not look," said Dr Luis Martinez Otero, a neuroscientist from the Institute of Neuroscience in Alicante, Spain who conducted the study.
To get a more complete picture about the reasons behind Mona Lisa's smile Dr. Martinez Otero consider various different aspects of the Mona Lisa.
He then proceed through different visual channel, and ask the volunteers if they see the smile in the painting or not.
Volunteers tend to see the Mona Lisa smile after they had previously shown a dark screen, and make Martinez Otero concluded that the central cells is Mona Lisa's smile can be felt.
Is Leonardo intend to sow so much confusion in the audience of his paintings brain? Martinez Otero argues. Leonardo wrote in one notebook that he is trying to paint a dynamic expression, because that is what he sees on the street. "
This research was originally presented at the Society for Neuroscience annual meeting in Chicago. This is not the first time for scientists to deconstruct the work of Leonardo da Vinci's.
In 2000, Margaret Livingstone, a neuroscientist at Harvard Medical School, suggests that Mona Lisa's smile is more prominent in the camera than the center of the eye.
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