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Sunday, 06 October 2002

Visual Perception

Adrian explains the optical illusion that has been doing the rounds:

" It all comes down to space, or rather, lack thereof. There are roughly 130 million photoreceptor cells in the retina of the eye, each of which individually making measurements of the amount of light falling on it. However, if you look at the optic nerve that conveys information from the retina to the brain, there are only 1 million nerve fibres. That's a contention ratio of 130 to 1, and the physiology of the situation dictates that one neurone cannot possibly contain all the information produced by 130 photoreceptors. There is a good reason for this, to do with the wiring of the retina and neural bandwidth limits, but you'll just have to take my word for it for now." [more]

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