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A binocular contribution to perceived speed of self-motion perception.

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It is well known that the optic flow provides a wealth of information to help the observer establish her self-motion and the layout of the environment. Binocular information may therefore be nearly superfluous for navigation tasks. Indeed, previous demonstrations of a binocular contribution to perception of heading direction are subtle and have been disputed. Here I ask whether binocular information contributes to the perceived speed of self-motion. To identify which aspects of binocular signals contribute and which motion sensitive cortical regions are involved, we used a novel stimulus that decoupled optic flow from binocular information. Vergence and retinal disparity did not apear to enhance the judged speed of simulated self-motion. Head-centric disparity did, with correlated BOLD signals in areas V3A and V6.

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