Explain Perceptual constancy.
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Perceptual constancy is the brain's ability to perceive objects consistently despite changes in sensory input. It ensures that objects are recognized as stable and unchanging, even under varying conditions like changes in illumination, size, or angle. Three primary types include size constancy (perceiving an object's size as constant), shape constancy (maintaining recognition of an object's shape), and color constancy (perceiving consistent color despite different lighting conditions). Perceptual constancy allows for a stable perception of the world, facilitating accurate recognition and interpretation of objects across different contexts.