- Subjective constancy
Subjective constancy or perceptual constancy is the
perceptionof an object or quality as constant under changing conditions.
In vision this means perceiving a color as "constant under changing conditions of illumination" harv|Erickson|1975|pp=11-12 and "is the achievement of a very complicated 'calculation' by an unconsciously working apparatus within our
central nervous system" harv|Lorenz|1961|p=171.
There are several types of perceptual constancies:-
* Lightness constancy
music, subjective constancy is the identification of a musical instrumentas constant under changing timbreor "conditions of changing pitch and loudness, in different environments and with different players." harv|Erickson|1975
speech perceptionthis means that vowels or consonants are perceived as constant categories even if acoustically, they vary greatly due to phonetic environment ( coarticulation), speech tempo, speaker's age and sex, speaker's dialect, etc.
*citation|last=Erickson|first=Robert|year=1975|title=Sound Structure in Music|publisher=University of California Press|isbn=0-520-02376-5.
*citation|last=Lorenz|first=Konrad|authorlink=Konrad Lorenz|year=1961|chapter=The Role of Gestalt Perception in Animal and Human Behaviour|title=Aspects of Form|pages=157-178|editor=Lancelot Law Whyte|publisher=Indiana University Press
*citation|last=Sayre|first=K.M.|year=1968|chapter=Toward a Quantitative Model of Pattern Formation|title=Philosophy and Cybernetics|pages=149-152|editor=Frederick J. Crosson and Kenneth M. Sayre|publisher=Simon and Schuster.
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