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  No role for the vestibular system in quickly determining whether a ball will land in front of or behind you

Brouwer, A.-M., Lopez-Moliner, J., Brenner, E., & Smeets, J. (2004). No role for the vestibular system in quickly determining whether a ball will land in front of or behind you. Poster presented at 5th International Multisensory Research Forum (IMRF 2004), Barcelona, Spain.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D917-A Version Permalink: http://hdl.handle.net/21.11116/0000-0006-43AC-D
Genre: Poster

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http://imrf.mcmaster.ca/2004.html (Table of contents)
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 Creators:
Brouwer, A-M1, 2, Author              
Lopez-Moliner , J, Author
Brenner, E, Author              
Smeets, J, 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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Chapman (1968) proposed that ball catchers run backwards when they see the projection of an approaching ball accelerate, and forwards when they see it decelerate. However, we suggested that the threshold for distinguishing acceleration from deceleration is too high to account for catchers' performance (Brouwer et al., 2002). This work has been criticized for generalizing thresholds as measured on small screens to a ball catching situation (Zaal et al., 2003). In real ball catching, subjects track the ball by making head movements. This allows for the possibility that signals from the vestibular system reduce the acceleration threshold. We simulated the first 319 ms of approaching balls on a large screen and asked 10 subjects to judge whether the balls would land behind or ahead of them. Subjects did not perform better when they tracked the balls with their head compared to when they kept their head stationary. It is thus unlikely that tracking enables subjects to use acceleration. We propose an alternative cue, which is based on a combination of the rate of expansion of the ball's projection, and its angular velocity. We found some (tentative) evidence for the use of rate of expansion as proposed by our cue.

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 Dates: 2004-06
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: BrouwerLBS2004
 Degree: -

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Title: 5th International Multisensory Research Forum (IMRF 2004)
Place of Event: Barcelona, Spain
Start-/End Date: 2004-06-02 - 2004-06-05

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Title: 5th International Multisensory Research Forum (IMRF 2004)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 63 Start / End Page: - Identifier: -