Abstract
Two experiments attempted to de termine the distance (as visual angle) over which the Zöllner distortion of a straight line could be produced by a background field. Experiment 1 showed that the background lines did not need to intersect the test line in order to distort it but could exert this effect up to a distance of 1 deg visual angle from it. Experiment 2 indicated that when the background lines do intersect the test line portions of these formed beyond an angle of 1 deg do not contribute to the distortion. These values may indicate the size of the cortical receptive fields interacting to produce the illusion.
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Wallace, G.K. The critical distance of interaction in the Zöllner illusion. Perception & Psychophysics 5, 261–264 (1969). https://doi.org/10.3758/BF03209558
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DOI: https://doi.org/10.3758/BF03209558