Which of the following are true about perceptual constancy ?
A. It applies to perception of size and colour only
B. Many visual illusions may be explained by the various constancies
C. Constancies occur in all sensory modalities
D. It keeps the appearance of objects the same inspite of large variations in the initial representation of the stimuli received by the sense organs that are engendered by various environmental factors.
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Correct answer: B. B, C, D only
Explanation
Constancies keep appearance stable despite changing input, exist in all modalities and explain many illusions; they are not limited to size and colour.
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