The limits of shape constancy: Point-to-point mapping of perspective projections of flat figures

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5 Scopus citations


The present experiments investigate point-to-point mapping of perspective transformations of 2D outline figures under diverse viewing conditions: binocular free viewing, monocular perspective with 2D cues masked by an optic tunnel, and stereoptic viewing through an optic tunnel. The first experiment involved upright figures, and served to determine baseline point-to-point mapping accuracy, which was found to be very good. Three shapes were used: square, circle and irregularly round. The main experiment, with slanted figures, involved only two shapes-square and irregularly shaped-showed at several slant degrees. Despite the accumulated evidence for shape constancy when the outline of perspective projections is considered, metric perception of the inner structure of such projections was quite limited. Systematic distortions were found, especially with more extreme slants, and attributed to the joint effect of several factors: anchors, 3D information, and slant underestimation. Contradictory flatness cues did not detract from performance, while stereoptic information improved it.

Original languageEnglish
Pages (from-to)97-104
Number of pages8
JournalBehaviour and Information Technology
Issue number2
StatePublished - 1 Mar 2002

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • General Social Sciences
  • Human-Computer Interaction


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