Sensitivity of human visual cortical area V6 to stereoscopic depth gradients associated with self-motion.

ABSTRACT: The principal visual cue to self-motion (egomotion) is optic flow, which is specified in terms of local 2D velocities in the retinal image without reference to depth cues. However, in general, points near the center of expansion of natural flow fields are distant, whereas those in the periphery are closer, creating gradients of horizontal binocular disparity. To assess whether the brain combines disparity gradients with optic flow when encoding egomotion, stereoscopic gradients were applied to expanding dot patterns presented to observers during functional MRI scanning. The gradients were radially symmetrical, disparity changing as a function of eccentricity. The depth cues were either consistent with egomotion (peripheral dots perceived as near and central dots perceived as far) or incons

SUBMITTER: Cardin V 

PROVIDER: S-EPMC3174812 | biostudies-literature | 2011 Sep

REPOSITORIES: biostudies-literature