| NOUN | cognition | brightness constancy | the tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination |
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| Meaning | The tendency for a visual object to be perceived as having the same brightness under widely different conditions of illumination. | |
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| Broader | constancy, perceptual constancy | (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation |
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