What is perceptual constancy? Explain and identify the three main types of perceptual constancies,including an example of each.

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--The process by which we perceive stimuli consistently across varied conditions is perceptual constancy.There are several kinds of perceptual constancy-shape,size,and colour constancy.
--Shape constancy: we still see a door as a door whether it's completely shut,barely open,or more fully open,even though these shapes differ markedly from each other.
--Size constancy: our ability to perceive objects as the same size no matter how near or far away they are from us.When a friend walks away from us,her image becomes smaller.But we almost never realize this is happening,nor do we conclude that our friend is mysteriously shrinking.
--Colour constancy: is our ability to perceive colour consistently across different levels of illumination.Consider a group of firefighters dressed in bright yellow jackets.Their jackets look bright yellow even in very low levels of ambient light.That's because our perceptual apparatus evaluates the colour of an object in the context of background light and surrounding colours.

What Is Perceptual Constancy? Explain and Identify the Three Main