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ERIC Number: EJ1006949
Record Type: Journal
Publication Date: 2013-Apr
Pages: 6
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0010-0277
Learning Different Light Prior Distributions for Different Contexts
Kerrigan, Iona S.; Adams, Wendy J.
Cognition, v127 n1 p99-104 Apr 2013
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 illumination, 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 illumination 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 degrees. Greater learning occurred when training for the two contexts (red or green light) was intermingled rather than when it was sequentially blocked. (Contains 3 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A