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  Humans do not have direct access to retinal flow during walking

Souman, J., Freeman, T., Eikmeier, V., & Ernst, M. (2010). Humans do not have direct access to retinal flow during walking. Journal of Vision, 10(11): 14, pp. 1-12. doi:10.1167/10.11.14.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-BE4A-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-6AB0-0
Genre: Journal Article

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 Creators:
Souman, JL1, 2, Author              
Freeman, TCA, Author              
Eikmeier, V1, 2, Author              
Ernst, MO1, 2, Author              
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1Research Group Multisensory Perception and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497806              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Perceived visual speed has been reported to be reduced during walking. This reduction has been attributed to a partial subtraction of walking speed from visual speed (F. H. Durgin K. Gigone, 2007; F. H. Durgin, K. Gigone, R. Scott, 2005). We tested whether observers still have access to the retinal flow before subtraction takes place. Observers performed a 2IFC visual speed discrimination task while walking on a treadmill. In one condition, walking speed was identical in the two intervals, while in a second condition walking speed differed between intervals. If observers have access to the retinal flow before subtraction, any changes in walking speed across intervals should not affect their ability to discriminate retinal flow speed. Contrary to this “direct access hypothesis,” we found that observers were worse at discrimination when walking speed differed between intervals. The results therefore suggest that observers do not have access to retinal flow before subtraction. We also found that the amount of subtraction depended on the visual speed presented, suggesting that the interaction between the processing of visual input and of self-motion is more complex than previously proposed.

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 Dates: 2010-09
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1167/10.11.14
BibTex Citekey: 6723
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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: 10 (11) Sequence Number: 14 Start / End Page: 1 - 12 Identifier: ISSN: 1534-7362
CoNE: https://pure.mpg.de/cone/journals/resource/111061245811050