Stereo vision and isoluminance

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character
R L Gregory


Recent experiments have shown that stereo depth is given by fusion of illusory ('cognitive') contours. They occur across quite large gaps in figures, when these gaps are unlikely and form the shape of a probable (nearer) masking object or masking feature. Implications are that: (a) clearly defined contours and regions of brightness difference can be produced as postulates from sensory evidence, which may be surprising absence of stimulation; (b) each eye-system can derive its own postulates, or hypotheses, which (c) can be combined to give stereo vision. It has been shown that random-dot stereo depth does not occur when there is colour contrast but no brightness difference between the dots and their background. This we have confirmed by using a new technique for producing isoluminant pictures, of any complexity, with exact registration for any two colours. With this technique, we find large displacements of narrow borders bounding regions that are shifted across isoluminance. These displacements, which are clearly seen as movements, occur with or without colour differences. The direction of shift depends on whether the narrow border is light or dark. It is found that these dramatic shifts do not - when produced in opposite dire...Continue Reading


Feb 1, 1983·The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology·R L Gregory, P F Heard
Nov 1, 1988·Perception & Psychophysics·R A Akerstrom, J T Todd
Sep 5, 2007·The European Journal of Neuroscience·Peter H SchillerVeronica S Weiner
Oct 24, 2007·Vision Research·Kai HamburgerKarl R Gegenfurtner
Jul 1, 1995·Vision Research·P CavanaghJ Rivest
Jan 1, 1992·Perception·G W StuartM L Cook
Oct 1, 1990·The International Journal of Neuroscience·T Shipley, H Shore

Related Concepts

Study, Methodological
Visual Perception
Neural Stem Cells
Contour Form

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