Size constancy is a psychological phenomenon that enables individuals to perceive an object as having a given size, regardless of the distance or the changes to the visual image it produces. The phenomenon describes how the brain measures size based on context, depth perception, and memory. It aids humans in making sense of their surroundings despite alterations in visual situational parameters. Size constancy is a clear illustration of how perception goes beyond simple reception and includes interpretation based on experience and expectations. For example, to an observer, a person walking away produces a smaller visual image, yet they are still perceived as being the same size.
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