June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Stereograms that consist of veridical image for one eye and lightness afterimage for the other eye
Author Affiliations
  • Masahiro Ishii
    University of Toyama
  • Zheng Tang
    University of Toyama
  • Hiroki Tamura
    University of Toyama
Journal of Vision June 2006, Vol.6, 654. doi:10.1167/6.6.654
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      Masahiro Ishii, Zheng Tang, Hiroki Tamura; Stereograms that consist of veridical image for one eye and lightness afterimage for the other eye. Journal of Vision 2006;6(6):654. doi: 10.1167/6.6.654.

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Abstract

Stereograms are pairs of images that differ in the relative lateral displacement of elements such that, when viewed stereoscopically, they produce compelling illusions of depth from a completely flat surface. In the meantime, prolonged steady viewing of an achromatic stimulus with high contrast produces afterimage that has opposite lightness of its original stimulus. This study examined if a stereogram that consists of a veridical image for one eye and a lightness afterimage for the other eye produces depth perception. In experiment, human subjects observed computer-generated stimuli with a mirror stereoscope in a darkroom. Each trial of the experiment consisted of an adaptation phase and a test phase. Random-dot stereograms, in which a central square area had crossed or uncrossed disparity against the surround area, were used. In an adaptation phase, a random-dot image that consisted of white colored dots on black background was displayed to one eye, while the other eye's image was fully black. Subject stared at a fixation point provided at the center of the stimulus for 45 seconds. In a test phase, the random-dot image was erased and fully white display was alternatively given to the one eye, while the half of the random-dot stereogram was given as a veridical image, black dots on white background, to the other eye. Ten subjects, every subject could perceive depth from conventional random-dot stereograms and lightness afterimage took part in the experiment. As the experimental result, all the subjects perceived depth from the stereograms with lightness afterimages and veridical images.

Ishii, M. Tang, Z. Tamura, H. (2006). Stereograms that consist of veridical image for one eye and lightness afterimage for the other eye [Abstract]. Journal of Vision, 6(6):654, 654a, http://journalofvision.org/6/6/654/, doi:10.1167/6.6.654. [CrossRef]
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