A Bayesian Account of Visual-Vestibular Interactions in the Rod-and-Frame Task.

Autor:	Alberts BB; Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen , Nijmegen, The Netherlands., de Brouwer AJ; Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, Nijmegen, The Netherlands; Centre for Neuroscience Studies, Queen's University Kingston, Kingston, Canada., Selen LP; Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen , Nijmegen, The Netherlands., Medendorp WP; Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen , Nijmegen, The Netherlands.
Jazyk:	angličtina
Zdroj:	ENeuro [eNeuro] 2016 Nov 03; Vol. 3 (5). Date of Electronic Publication: 2016 Nov 03 (Print Publication: 2016).
DOI:	10.1523/ENEURO.0093-16.2016
Abstrakt:	Panoramic visual cues, as generated by the objects in the environment, provide the brain with important information about gravity direction. To derive an optimal, i.e., Bayesian, estimate of gravity direction, the brain must combine panoramic information with gravity information detected by the vestibular system. Here, we examined the individual sensory contributions to this estimate psychometrically. We asked human subjects to judge the orientation (clockwise or counterclockwise relative to gravity) of a briefly flashed luminous rod, presented within an oriented square frame (rod-in-frame). Vestibular contributions were manipulated by tilting the subject's head, whereas visual contributions were manipulated by changing the viewing distance of the rod and frame. Results show a cyclical modulation of the frame-induced bias in perceived verticality across a 90° range of frame orientations. The magnitude of this bias decreased significantly with larger viewing distance, as if visual reliability was reduced. Biases increased significantly when the head was tilted, as if vestibular reliability was reduced. A Bayesian optimal integration model, with distinct vertical and horizontal panoramic weights, a gain factor to allow for visual reliability changes, and ocular counterroll in response to head tilt, provided a good fit to the data. We conclude that subjects flexibly weigh visual panoramic and vestibular information based on their orientation-dependent reliability, resulting in the observed verticality biases and the associated response variabilities. Competing Interests: Authors report no conflict of interest.
Databáze:	MEDLINE
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