Abstract:
:Animal survival in the forest, and human success on the sports field, often depend on the ability to seize a target on the fly. All bodies fall at the same rate in the gravitational field, but the corresponding retinal motion varies with apparent viewing distance. How then does the brain predict time-to-collision under gravity? A perspective context from natural or pictorial settings might afford accurate predictions of gravity's effects via the recovery of an environmental reference from the scene structure. We report that embedding motion in a pictorial scene facilitates interception of gravitational acceleration over unnatural acceleration, whereas a blank scene eliminates such bias. Functional magnetic resonance imaging (fMRI) revealed blood-oxygen-level-dependent correlates of these visual context effects on gravitational motion processing in the vestibular nuclei and posterior cerebellar vermis. Our results suggest an early stage of integration of high-level visual analysis with gravity-related motion information, which may represent the substrate for perceptual constancy of ubiquitous gravitational motion.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Miller WL,Maffei V,Bosco G,Iosa M,Zago M,Macaluso E,Lacquaniti Fdoi
10.1152/jn.00889.2007subject
Has Abstractpub_date
2008-04-01 00:00:00pages
1969-82issue
4eissn
0022-3077issn
1522-1598pii
00889.2007journal_volume
99pub_type
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