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  Testing models of peripheral encoding using metamerism in an oddity paradigm

Wallis, T., Bethge, M., & Wichmann, F. (2016). Testing models of peripheral encoding using metamerism in an oddity paradigm. Journal of Vision, 16(2): 4, pp. 1-30. doi:10.1167/16.2.4.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-7A0E-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FA7E-A
Genre: Journal Article

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Wallis, T, Author
Bethge, M1, 2, Author              
Wichmann, FA3, Author              
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497805              
3Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society, ou_1497647              

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 Abstract: Most of the visual field is peripheral, and the periphery encodes visual input with less fidelity compared to the fovea. What information is encoded, and what is lost in the visual periphery? A systematic way to answer this question is to determine how sensitive the visual system is to different kinds of lossy image changes compared to the unmodified natural scene. If modified images are indiscriminable from the original scene, then the information discarded by the modification is not important for perception under the experimental conditions used. We measured the detectability of modifications of natural image structure using a temporal three-alternative oddity task, in which observers compared modified images to original natural scenes. We consider two lossy image transformations, Gaussian blur and Portilla and Simoncelli texture synthesis. Although our paradigm demonstrates metamerism (physically different images that appear the same) under some conditions, in general we find that humans can be capable of impressive sensitivity to deviations from natural appearance. The representations we examine here do not preserve all the information necessary to match the appearance of natural scenes in the periphery.

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 Dates: 2016-03
 Publication Status: Published in print
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 Identifiers: DOI: 10.1167/16.2.4
BibTex Citekey: WallisBW2016_2
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Title: Journal of Vision
Source Genre: Journal
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Pages: - Volume / Issue: 16 (2) Sequence Number: 4 Start / End Page: 1 - 30 Identifier: -