APPARENT TRANSPARENCY IN MOTION: VISUAL PHANTOMS AND THE ROSENBACH EFFECT.

  • Rossana Actis-Grosso
  • Giovanni Bruno Vicario
  • Mario Zanforlin

Abstract

When a stripe is partially overlapping a figure of different colour, it is possible to see the stripe as apparently transparent (i.e. the Rosenbach effect). This effect has also been dubbed phantom effect and referred to other effects of “anomalous transparencyâ€. An experiment is presented, aimed at testing the role of motion of the occluding surface on the perception of transparency in the Rosenbach effect. Results show that the perception of transparency is enhanced when the occluding surface is moving; a possible explanation is suggested, based on simultaneous lightness contrast.

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