Positional shifts in the visual illusions of extent

  • Aleksandr Bulatov
  • Lina Mickiené
  • Natalija Bulatova


The present communication addresses a possible role of the perceptual position shifts of the stimulus parts in Brentano's illusion and related illusions of extent. The results of the present psychophysical experiments with detached Müller-Lyer wings are discussed in relation to the findings of some recent studies of full versions of illusory figures. It is shown that the effexts obtained strongly support the "centroid" explanation of illusions investigated.
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