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Brain neurons subtract images, use differences

Ten million bits -- that's the information volume transmitted every second with every quick eye movement from the eye to the cerebrum. Researchers describe the way those data are processed by the primary visual cortex, the entry point for the visual information into the brain. Deploying novel optical imaging methods, they demonstrated that the brain does not always transmit the entire image information. Rather, it uses the differences between current and previously viewed images.
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