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  Variance predicts visual-haptic adaptation in shape perception

Girshick, A., Banks, M., Ernst, M., Cooper, R., & Jacobs, R. (2002). Variance predicts visual-haptic adaptation in shape perception. Poster presented at Second Annual Meeting of the Vision Sciences Society (VSS 2002), Sarasota, FL, USA.

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Girshick, AR, Author
Banks, MS, Author              
Ernst, MO1, 2, Author              
Cooper, R, Author
Jacobs, RA, Author
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: When people are exposed repeatedly to a conflict in visually and haptically specified shapes, they adapt and the apparent conflict is eventually eliminated. The inter-modal adaptation literature suggests that the conflict is resolved by adapting the haptic shape estimator. Another possibility is that both estimators adapt by amounts that depend on their relative variances. Thus, the visual estimator could adapt if its variance were high enough. Is relative reliability the better predictor of visual-haptic adaptation? We examined this by manipulating the variance of the visual signal during inter-modal adaptation and then measuring changes in the within-modal (vision-alone and haptics-alone) shape percepts. The stimulus was a 3D object with a rectangular front surface. It was specified visually by random-dot stereograms and haptically by PHANToM force-feedback devices. In pre- and post-tests, observers judged whether its front surface was taller or shorter than it was wide. For each modality, we found the aspect ratio that was perceptually a square. During adaptation, a conflict was created between the visually and haptically specified shapes by independently altering the visual and haptic aspect ratios of the front surface. The variance of the visual estimator (determined by dot number) was either low or high. We assessed the amount of visual and haptic adaptation by comparing pre- and post-test shape estimates. When the visual estimator's variance was low, essentially all of the adaptation occurred in the haptic estimator. When the visual estimator's variance was high, we observed visual and haptic adaptation. These results suggest that the relative reliability of visual and haptic estimators determines the relative amounts of visual and haptic adaptation.

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 Dates: 2002-11
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1167/2.7.670
BibTex Citekey: 1634
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Title: Second Annual Meeting of the Vision Sciences Society (VSS 2002)
Place of Event: Sarasota, FL, USA
Start-/End Date: 2002-05-10 - 2002-05-15

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Title: Journal of Vision
Source Genre: Journal
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Publ. Info: Charlottesville, VA : Scholar One, Inc.
Pages: - Volume / Issue: 2 (7) Sequence Number: - Start / End Page: 670 Identifier: ISSN: 1534-7362
CoNE: https://pure.mpg.de/cone/journals/resource/111061245811050