Learning a surfaces’ shape from binocular disparity and perceiving it from shading

  • Tadamasa Sawada Zaven & Sonia Akian College of Science and Engineering, American University of Armenia, Yerevan, Armenia; School of Psychology, HSE University, Moscow, Russia; and Department of Psychology, Russian-Armenian (Slavonic) University, Yerevan, Armenia https://orcid.org/0000-0002-7167-1464
  • Hirohiko Kaneko Department of Information and Communications Engineering, Institute of Science Tokyo, Yokohama, Japan
Keywords: Eureka effect, depth perception, perceptual learning, shape from shading

Abstract

Some special images are known to produce a learning effect in 3D perception. This image represents a 3D scene but it has been degraded so that the 3D information of the scene can be perceived from the image only after the learning has taken place. This study presents a new type of image that is not degraded but can produce a learning effect in 3D perception. This image has a luminance gradient of shading that represents a saddle (hyperbolic) shape that is perceived on the basis of the gradient only after the saddle shape has been learnt on the basis of binocular disparity. This learning effect suggests that the 3D information can be transferred across depth cues in the visual system.

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Published
2026-06-26
How to Cite
Sawada , T., & Kaneko , H. (2026). Learning a surfaces’ shape from binocular disparity and perceiving it from shading. Journal of Illusion, 6. https://doi.org/10.47691/joi.v6.13041
Section
Phenomenal reports