Perceptual Constancies: The tendency of animals and humans to see familiar objects as having standard shape, size, color, or location regardless of changes in the angle of perspective, distance, or lighting.
Size constancy is the tendency to perceive the veridical size of a familiar object despite differences in their distance. This means that within a certain range, people’s perception of one particular objects’ size will not change, regardless of changes in distance. This is useful in that it will allow a person or animal to see objects in their actual size unless they are very far away. Some examples of size constancy are the Muller-Lyer illusion and Ponzo illusion. The image shown proves that are brain will make objects that are perceived to be farther away bigger so that they more accurately display their actual size. In the image both yellow lines are the same size.
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