Perception: A HyperCard stack for demonstrating visual perceptual phenomena

  • Ismael E. CarrerasEmail author
5. Instructional Software


Perception is a HyperCard stack that allows users to explore visual illusions and other perceptual phenomena on the Apple Macintosh. The stack contains over 20 demonstrations of intersecting line illusions, size and shape illusions, subjective contours, color assimilation, and so forth. As a presentation tool for classroom or laboratory demonstrations, Perception offers three unique features for displaying visual phenomena: (1) the capability to “dissolve” the inducing elements of an illusion in order to show the objective state of affairs, (2) the ability to quickly reverse the inducing elements of an illusion and therefore the effects of the distortion, and (3) animation of the various components of an illusion to produce continuous distortions in-real time. These features are illustrated with use of the Orbison, Titchener, Hering, and Wundt illusions. Use of the stack reveals two interesting and unanticipated findings: (1) an apparent size distortion in the central square of the Orbison illusion as it moves back and forth across the background of concentric rings, and (2) perceptual aftereffects that arise when the inducing elements of the Titchener, Hering, or Wundt illusion is dissolved.


Concentric Ring Illusory Contour Visual Illusion Subjective Contour Main Menu 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Atkinson, B. (1987).HyperCard [Computer program]. Cupertino, CA: Apple Computer.Google Scholar
  2. Bradley, D. R. (1987). Cognitive contours and perceptual organization. In S. Petty & G. Meyer (Eds.),The perception of illusory contours (pp. 201–212). New York: Springer-Verlag.Google Scholar
  3. Bradley, D. R., &Lee, K. (1982). Animated subjective contours.Perception & Psychophysics,32, 393–395.Google Scholar
  4. Carreras, I. E. (1990).Animated chromatic subjective contours. Unpublished senior thesis, Bates College, Lewiston, ME.Google Scholar
  5. Chute, D. L. (1986). MacLaboratory for psychology: General experimental psychology with Apple’s Macintosh.Behavioral Research Methods, Instruments, & Computers,18, 205–209.CrossRefGoogle Scholar
  6. Dougherty, T. D. (1990). Contour: A hypermedia environment for teaching about subjective contours and other visual illusions.Behavioral Research Methods, Instruments, & Computers,22, 223–227.Google Scholar
  7. Enns, J. T., Ochs, E. P., &Rensink, R. A. (1990). VSearch: Macintosh software for experiments in visual research.Behavioral Research Methods, Instruments, & Computers,22, 118–122.Google Scholar
  8. Gerbino, W., &Kanizsa, G. (1987). Can we see constructs? In S. Petty & G. E. Meyer, (Eds.),The perception of illusory contours (pp. 246–252). New York: Springer-Verlag.Google Scholar
  9. True, R. (1990).Apparent size distortion in the Orbison illusion. Unpublished senior thesis, Bates College, Lewiston, ME.Google Scholar

Copyright information

© Psychonomic Society, Inc. 1993

Authors and Affiliations

  1. 1.Bates CollegeLewiston

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