Humans are intelligent animals relying heavily on the sense of vision. More than 80% of information collected from our surroundings is visual. Needless to say, such visual information enters the human sensory system at the eye retina at which the image of an exterior object is detected. The operation of the visual system is quite mysterious. The retina has a 2-dimensional surface. The retina converts an image into an electrical signal, so inherently 3-dimensional information about an exterior object is reduced down to 2-dimensional data. How does the human brain reconstruct a 3-dimensional figure from the 2-dimensional picture on the retina? This very complicated process still eludes the efforts of cognitive neu-roscientists.
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