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  The contribution of the visual scene to disambiguation of optic flow with vestibular signals

Butler, J., MacNeilage, P., Banks, M., & Bülthoff, H. (2007). The contribution of the visual scene to disambiguation of optic flow with vestibular signals. Poster presented at 10th Tübinger Wahrnehmungskonferenz (TWK 2007), Tübingen, Germany.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-CD1D-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-01C7-A
Genre: Poster

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 Creators:
Butler, J1, 2, Author              
MacNeilage, P, Author              
Banks, M, Author              
Bülthoff, HH1, 2, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Optic flow is generated by observer motion relative to stationary objects, by movement of objects relative to a stationary observer, and by combinations of those situations. To determine the relative contributions of object and self motion to the observed optic flow, the nervous system can use vestibular signals. An object’s speed relative to earth is given by the difference between its speed relative to the head and the head’s speed relative to the earth. The variance of the difference is the sum of the component variances. In contrast, if observers estimate self-motion from optic flow and vestibular signals, and assume a stationary visual scene, visual and vestibular estimates may be combined in a weighted average to yield more precise selfmotion estimates. So depending on whether the subject reports object motion or self-motion, the two-modality variance is predicted to be respectively higher or lower than the component variances. To test these predictions and the influence of the visual scene upon them, we measured speed-discrimination thresholds for fore-aft translations. There were two single-modality conditions, Visual and Vestibular, and two multi-modality conditions, Self-motion and Object motion. In the Visual, Vestibular, and Self-motion conditions, observers indicated if the movement was faster or slower than a standard. In the Object-motion condition, observers indicated if the object appeared to move with or against the self-motion. The experiment was run for two visual scenes, random-dots and ground plane with columns. In both scenes, multi-modal object-motion thresholds were, as predicted, higher than single-modality thresholds, and multimodal self-motion thresholds were, as predicted, generally lower than single- modality thresholds. For the ground plane scene, the self-motion thresholds could be consistently predicted by the weighted average of the single modalities, which was not the case for the random-dots condition.

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 Dates: 2007-07
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: BibTex Citekey: 4514
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Title: 10th Tübinger Wahrnehmungskonferenz (TWK 2007)
Place of Event: Tübingen, Germany
Start-/End Date: 2007-07-27 - 2007-07-29

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Title: 10th Tübinger Perception Conference: TWK 2007
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Chatziastros, A1, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Affiliations:
1 Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 147 Identifier: ISBN: 3-927091-77-4