| Where is the light? Bayesian perceptual priors for lighting direction. | |
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MedLine Citation:
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PMID: 19324801 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Perception of shaded three-dimensional figures is inherently ambiguous, but this ambiguity can be resolved if the brain assumes that figures are lit from a specific direction. Under the Bayesian framework, the visual system assigns a weighting to each possible direction, and these weightings define a prior probability distribution for light-source direction. Here, we describe a non-parametric maximum-likelihood estimation method for finding the prior distribution for lighting direction. Our results suggest that each observer has a distinct prior distribution, with non-zero values in all directions, but with a peak which indicates observers are biased to expect light to come from above left. The implications of these results for estimating general perceptual priors are discussed. |
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Authors:
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J V Stone; I S Kerrigan; J Porrill |
Publication Detail:
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Type: Journal Article Date: 2009-02-25 |
Journal Detail:
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Title: Proceedings. Biological sciences / The Royal Society Volume: 276 ISSN: 0962-8452 ISO Abbreviation: Proc. Biol. Sci. Publication Date: 2009 May |
Date Detail:
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Created Date: 2009-04-08 Completed Date: 2009-07-02 Revised Date: 2010-09-22 |
Medline Journal Info:
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Nlm Unique ID: 101245157 Medline TA: Proc Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 1797-804 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Sheffield, Sheffield S10 2TP, UK. j.v.stone@shef.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bayes Theorem Humans Light* Likelihood Functions Models, Theoretical Visual Perception / physiology* |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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