The human retina the part of the eye that converts incoming light into electrochemical signals has about 100 million light-sensitive cells. So retinal images contain a huge amount of data. High-level visual-processing tasks like object recognition, gauging size and distance, or calculating the trajectory of a moving object couldn't possibly preserve all that data: The brain just doesn't have enough neurons. So vision scientists have long assumed that the brain must somehow summarize the content of retinal images, reducing their informational load before passing them on to higher-order processes. Read more on ScienceDaily
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