PROJECTIVE INVARIANCE AND PICTURE PERCEPTION

Authors
  1. Niall, K.K.
  2. Macnamara, J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);McGill Univ, Montreal QUE (CAN) Dept of Psychology
Abstract
Four experiments test the assumption that, in the visual perception of pictures, observers have reliable and direct access to the equivalence of shapes in projective geometry. The assumption is that perception of projective equivalance is the basis of shape constancy ('the projective thesis'). Observers matched or reproduced abstract planar shapes under conditions of rotation in the picture plane, and pictured rotation in depth. Depature from projective equivalance was assessed ineach study by measuring the planar analogue of cross ratio. Projective equivalance was not found to be perceived uniformly where Euclidean equivalence was not judged uniformly, either in recognition tasks or in production tasks. When the projective thesis is put to a suitably general test, confidence in the thesis is undermined.
Report Number
DCIEM-89-P-56 — Reprint
Date of publication
15 Jan 1990
Number of Pages
25
Reprinted from
Perception, vol 19, 1990, p 637-660
DSTKIM No
93-00061
CANDIS No
127316
Format(s):
Hardcopy;Originator's fiche received by DSIS

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