title: A New Angle on Object-Background Effects in Vection.
abstract: We considered whether optic flow generated by 3D relief of a foreground surface might influence visually-mediated self-motion perception (vection). We generated background motion consistent with self-rotation, and a foreground object with bumpy relief was either rotated with the observer (ego-centric) or fixed in world coordinates (world-centric). We found that vection strength ratings were greater in conditions with world-centric retinal motion of the foreground object, despite generating flow that was opposite to background motion. This effect was explained by observer judgments of the axis self-rotation in depth; whereas ego-centric flow generated experiences of more on-axis self-rotation, world-centric flow generated experiences of centrifugal rotation around the foreground object. These data suggest that foreground object motion can increase the perception of self-motion generated by optic flow, even when they reduce net retinal motion coherence and promote conditions for multisensory conflict. This finding supports the view that self-motion perception depends on mid-level representations of whole-scene motion.
authors.affiliation: School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia.
authors.forename: Juno
authors.initials: J
authors.lastname: Kim
authors.affiliation: School of Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia.
authors.forename: Michael T T
authors.initials: MT
authors.lastname: Tran
keywords: diffuse; reflectance; self-motion perception; specular; vection; vision