perceptual constancy,
constancy the quality of being enduring and free from change or variation; "early mariners relied on the constancy of the trade winds"
perception -
cognition That which is detected by the five senses; not necessarily understood imagine looking through fog, trying to understand if you see a small dog or a cat; also that which is detected within consciousness as a thought, intuition, deduction, etc.
Wikipedia
Perception is the process of attaining awareness or understanding of sensory information. The word "perception" comes from the Latin words perceptio, percipio, and means "receiving, collecting, action of taking possession, apprehension with the mind or senses. " Perception is one of the oldest fields in psychology.
OmegaWiki Dictionary
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perception The conscious understanding of something.