Learning different light prior distributions for different contexts

Kerrigan, Iona S and Adams, Wendy J. (2013) Learning different light prior distributions for different contexts Cognition, 127, (1), pp. 99-104. (doi:10.1016/j.cognition.2012.12.011).


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The pattern of shading across an image can provide a rich sense of object shape. Our ability to use shading information is remarkable given the infinite possible combinations of illumi- nation, shape and reflectance that could have produced any given image. Illumination can change dramatically across environments (e.g. indoor vs. outdoor) and times of day (e.g. mid-day vs. sunset). Here we show that people can learn to associate particular illumination conditions with particular contexts, to aid shape-from-shading. Following a few hours of visual–haptic training, observers modified their shape estimates according to the illumina- tion expected in the prevailing context. Our observers learned that red lighting was roughly overhead (consistent with their previous assumption of lighting direction), whereas green lighting was shifted by 10°. Greater learning occurred when training for the two contexts (red or green light) was intermingled rather than when it was sequentially blocked

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.cognition.2012.12.011
ISSNs: 0010-0277 (print)
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Organisations: Psychology
ePrint ID: 347779
Date :
Date Event
January 2013e-pub ahead of print
April 2013Published
Date Deposited: 30 Jan 2013 15:29
Last Modified: 17 Apr 2017 16:07
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/347779

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