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  Hitting moving targets: Using the target's direction of motion

Brouwer, A.-M., Middelburg, T., Smeets, J., & Brenner, E. (2003). Hitting moving targets: Using the target's direction of motion. Poster presented at 6. Tübinger Wahrnehmungskonferenz (TWK 2003), Tübingen, Germany.

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 Creators:
Brouwer, A-M1, 2, Author              
Middelburg , T, Author
Smeets, JBJ, Author
Brenner, E, 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: Previous work indicated that people do not use the speed at which a target is perceived to move to determine where to hit it. Instead, they use the target's changing position and an expected speed (based on the speed of previous targets). In the present study we investigate whether people also ignore the target's perceived direction of motion, and use the target's changing position and an expected movement direction instead. Subjects hit targets that moved in slightly dierent directions across a screen. Sometimes the targets disappeared after 150 ms, long before the subjects could reach the screen. This prevented subjects from using the target's changing position to adjust their movements, making it possible to evaluate whether subjects were relying on the perceived or an expected (average) direction to guide their movements. The background also moved in some trials. This in uences the target's perceived movement direction while leaving its perceived position unaected. When the background was stationary, subjects did not hit disappearing targets fundamentally dierently than the ones that remained visible. The moving background aected the direction in which subjects started to move their hand, in accordance with the illusory change in direction of target motion. If the target remained visible, subjects corrected their initial error, presumably on the basis of information about the target's changing position. We conclude that in addition to the target's position, people use the target's perceived direction of motion when hitting moving targets. Thus the perceived direction of motion is treated dierently than the perceived speed.

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 Dates: 2003-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 2093
 Degree: -

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Title: 6. Tübinger Wahrnehmungskonferenz (TWK 2003)
Place of Event: Tübingen, Germany
Start-/End Date: 2003-02-21 - 2003-02-23

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Title: 6. Tübinger Wahrnehmungskonferenz: Sixth Perception Conference at Tübingen, TWK 2003
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Gegenfurtner, KR, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Wichmann, FA1, Editor            
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 89 Identifier: ISBN: 3-927091-62-6