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  Lighting-from-above prior in biological motion perception

Fedorov, L., Dijkstra, T., & Giese, M. (2018). Lighting-from-above prior in biological motion perception. Scientific Reports, 8: 1507, pp. 1-10. doi:10.1038/s41598-018-19851-8.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-DBA2-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-DBA3-D
Genre: Journal Article

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Fedorov, LA1, Author              
Dijkstra, TMH2, Author
Giese, MA, Author              
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1External Organizations, ou_persistent22              
2Max Planck Institute for Developmental Biology, Max Planck Society, Max-Planck-Ring 5, 72076 Tübingen, DE, ou_2421691              

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 Abstract: The visual system is able to recognize body motion from impoverished stimuli. This requires combining stimulus information with visual priors. We present a new visual illusion showing that one of these priors is the assumption that bodies are typically illuminated from above. A change of illumination direction from above to below flips the perceived locomotion direction of a biological motion stimulus. Control experiments show that the underlying mechanism is different from shape-from-shading and directly combines information about body motion with a lighting-from-above prior. We further show that the illusion is critically dependent on the intrinsic luminance gradients of the most mobile parts of the moving body. We present a neural model with physiologically plausible mechanisms that accounts for the illusion and shows how the illumination prior might be encoded within the visual pathway. Our experiments demonstrate, for the first time, a direct influence of illumination priors in high-level motion vision.

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 Dates: 2018-01
 Publication Status: Published online
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 Identifiers: DOI: 10.1038/s41598-018-19851-8
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: - Volume / Issue: 8 Sequence Number: 1507 Start / End Page: 1 - 10 Identifier: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322