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In this video I describe perceptual constancy, which refers to the idea that we perceive a relatively stable and unchanging world despite the fact that sensory information is changing dramatically. I explain how this applies visually to size, brightness, and shape. We often forget this learning process because it occurred during infancy, but it is demonstrated clearly in previously blind individuals who must slowly learn how to see following eye surgery.

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Need more explanation? Check out my full psychology guide: Master Introductory Psychology: http://amzn.to/2eTqm5s

An Anthropologist on Mars – Oliver Sacks: http://amzn.to/2mjlibz

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