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CONSTANCY PHENOMENON #0210/ 2010
(  Satoshi Kinoshita )
| Series: | Paintings: Landscape 2 | | Medium: | Acrylic on stretched canvas | | Size (inches): | 78.7 x 59.1 | | Size (mm): | 2000 x 1500 | | Catalog #: | PA_0140 | | Description: | Signed, titled, date, copyright in magic ink on the reverse.
constancy phenomenon -
In perception, the tendency for brightness, colour, size, or shape to remain relatively perceptually constant despite real changes in colour, size, shape or other conditions of observation.
-www.mondofacto.com/facts/dictionary?constancy+phenomenon
A colour constancy phenomenon related to perceived 3-D shape
S S Bergström, K-A Gustafsson, T Jakobsson
Flat, rectangular displays consisting of 2, 3, 4, or 6 vertical grey stripes, alternately light and dark gray (NCS 3500 and NCS 6000, respectively) were presented one at a time illuminated by two identical projectors. One projector illuminated the upper half of the display through a yellowish colour filter (Strand Golden Amber), and the other one illuminated the lower half through a bluish colour filter (Kodak Wratten 80 A). The display appeared ambiguous, periodically and spontaneously shifting between two distinct 3-D shape percepts, A and B. Display A appeared vertically folded along the reflectance edges (`shape from shading', where the dark fields appeared to be attached shadows). The colours were quite saturated yellow and blue surface colours. There was no colour constancy; Display B appeared horizontally folded along the illumination edge like a roof (`shape from shading', where one of the illuminations appeared to be an attached shadow). The display now appeared very desaturated, even achromatic, but in a `warm' illumination. The colour constancy was almost complete. The phenomenon is demonstrated with a slide, and some psychophysical data on the colour desaturation and on the frequency of shifts between the two percepts are reported as well as some observations on combinations of illuminant colours other than yellow and blue. The reported colour constancy phenomenon is discussed in relation to an earlier presented model for the perception of illumination, colour, and depth [S S Bergström, 1994, in Lightness, Brightness, and Transparency Ed. A Gilchrist (Hillsdale, NJ: Lawrence Erlbaum Associates)].
Copyright © 2010 a Pion publication
-www.perceptionweb.com/abstract.cgi?id=v96p0105
Illusory Perception as a Constancy Phenomenon
Gregory, Richard L.
Nature, Volume 204, Issue 4955, pp. 302-303 (1964).
THERE are several hints in the literature of perception of a possible tie-up between constancy and the illusions, but Tausch1 seems to have produced the first reasonably solid treatment, described clearly by Teuber2, though he has not developed a fully consistent theory. Brown and Houssiadas's reference to J. J. Gibson's The Perception of the Visual World3 in this connexion is surprising, for Gibson holds a view of constancy which precludes this kind of theory. Gibson starts off (p. 163) somewhat disconcertingly: ``The aim of this chapter is ultimately to show that the question of why things retain their sizes and shapes under different circumstances is a false question''. (The rest of the chapter is, however, devoted to this question.) He develops a theory of depth perception which he attributes to Koffka4-the size-at-a-distance theory-which is that all three spatial dimensions are equally available to the perceptual system. But in denying that depth has to be specially computed, Gibson rejects the notion of constancy scaling essential to this theory of the illusions. When Gibson uses the word `scale' he is evidently not referring to a process of size adjustment normally giving constancy, for several times he explicitly denies such processes in depth perception.
-adsabs.harvard.edu/abs/1964Natur.204..302G
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