Psychonomic Science

, Volume 23, Issue 2, pp 147–148 | Cite as

The effect of simulated receptor aging on two types of visual illusions

  • Kristen P. Sjostrom
  • Robert H. Pollack
Perception & Performance Senses


A Type I (Delboeuf illusion) and Type II (Usnadze effect) illusion were viewed both through and without a yellow filter by younger and older groups of adults. The filter served to simulate receptor aging by decreasing the visual sensitivity of the Ss. The magnitude of the Type I illusion decreased at both age levels when viewed through the filter, but the magnitude of the Type II illusion did not change. The results indicate that different mechanisms produce the ontogenetic trends of the two types of illusions.


Crystalline Lens Visual Sensitivity Illusion Magnitude Test Circle Illusory Effect 
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Copyright information

© Psychonomic Journals, Inc. 1971

Authors and Affiliations

  • Kristen P. Sjostrom
    • 1
  • Robert H. Pollack
    • 1
  1. 1.University of GeorgiaAthensUSA

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