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  Judging Size by Hand: No Benefit for Bimanual Estimates

Lange, C., & Ernst, M. (2005). Judging Size by Hand: No Benefit for Bimanual Estimates. Poster presented at 8th Tübinger Wahrnehmungskonferenz (TWK 2005), Tübingen, Germany.

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 Creators:
Lange, C1, 2, Author              
Ernst, MO1, 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, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: When redundant sources of sensory information are available, integrating these sources is beneficial for a system in order to decrease the perceptual noise and so to increase the accuracy of the overall percept [1]. However, a potential cost may come from incorrect binding of the different sources, which will generally evoke perceptual illusions [2]. Here we ask whether humans take advantage of a bimanual size estimate originating from an object of constant size. The stimulus was a cylindrical object that subjects felt with their left and right hand simultaneously. To display the bimanual haptic stimulus we used two PHANToM force-feedback devices and measured size discrimination performance using a 2IFC paradigm. Subjects’ task was to decide which of two bimanual stimuli was bigger. From the resulting psychometric functions we determined the JND for bimanual vs unimanual size discrimination and the point of subjective equality (PSE). There was no difference in the bimanual vs the unimanual JNDs which indicates that subjects did not benefit from having available two size estimates in the bimanual situation. We therefore conclude that there is no integration of size estimates between hands when an object is touched bimanually. We may speculate that this failure of integration to occur results from the fact that naturally the object is touched at slightly different spatial locations and so information is not truly redundant even though subjects were told to touch an object of constant size. Not being able to integrate information that comes from two different spatial locations may help to prevent misbinding of different sensory sources.

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 Dates: 2005-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: LangeE2005
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Title: 8th Tübinger Wahrnehmungskonferenz (TWK 2005)
Place of Event: Tübingen, Germany
Start-/End Date: 2005-02-25 - 2005-02-27

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Title: 8th Tübingen Perception Conference: TWK 2005
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, 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: 73 Identifier: ISBN: 3-927091-70-7