Vestibular nuclei and cerebellum put visual gravitational motion in context.

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 Neurophysiol

authors

Miller WL,Maffei V,Bosco G,Iosa M,Zago M,Macaluso E,Lacquaniti F

doi

10.1152/jn.00889.2007

subject

Has Abstract

pub_date

2008-04-01 00:00:00

pages

1969-82

issue

4

eissn

0022-3077

issn

1522-1598

pii

00889.2007

journal_volume

99

pub_type

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