Filled space expansion: constants, variants and determinants of the Oppel-Kundt phenomenon

  • Jiri Wackermann F


The Oppel-Kundt (OK) phenomenon, also known as 'illusion of filled space', provides a paradigmatic example of an illusory distortion of the visual field metric. Studies using various forms of the OK figure reveal non-monotonic functional dependences of the effect on the extent, density and orientation of the filling elements. The importance of these findings, and their possible consequences for an interactionist theory of the OK phenomenon, are discussed.
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