Disparity capture by flanking stimuli: a measure for the cooperative mechanism of stereopsis.
In this work the range and scaling properties of the cooperative (contextual) interaction that was first proposed by Julesz [Foundations of Cyclopean Perception, University of Chicago Press, Chicago, 1971] to address the correspondence problem in stereopsis is measured. To this end the effect that flanking difference of Gaussians (DoG) patches produce on a perception of a target pair of patches is studied. The relative depth configuration of the target pair can switch from the small disparity gradient to a large disparity gradient state as a result of cooperative effects of the flanking stimuli. It is found that the interaction strength falls with distance. Its range varies for different subjects from 2 to 3 DoG patch sizes and scales proportionally to the size of the stimuli. The results suggest that a very localized cooperative interaction is in effect at a broad range of spatial scales.
Petrov
Yury
Y
Gatsby Computational Neuroscience Unit, University College London, Alexandra House, 17 Queen Square, WC1N 3AR, UK. yury@gatsby.ucl.ac.uk
D000465:Algorithms; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D015357:Vision Disparity / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology*