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Reference.org
Subjective constancy
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<p>Subjective constancy or perceptual constancy is the <a href="/facts/Perception/xLK0n2q4">perception</a> of an object or quality as constant even though our <a href="/facts/Sensation_(psychology)/n9kYQ3rf">sensation</a> of the object changes. While the physical characteristics of an object may not change, in an attempt to deal with the external world, the human perceptual system has mechanisms that adjust to the stimulus. </p>