The variables that determine a person's ability to maintain size constancy do not include

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Size constancy is the ability to perceive the true size of an object despite changes in the size of its retinal image as the object moves closer or farther away. The variables that determine a person's ability to maintain size constancy include the distance between the object and the person, previous experience with the true size of the object, and the presence of surrounding objects. The size of the retinal image of the object, however, does not determine a person's ability to maintain size constancy.

The Variables That Determine a Person's Ability to Maintain Size