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  How sensitive is the human visual system to the local statistics of natural images?

Gerhard, H., Wichmann, F., & Bethge, M. (2013). How sensitive is the human visual system to the local statistics of natural images? PLoS Computational Biology, 9(1), 1-15. doi:10.1371/journal.pcbi.1002873.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-B516-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-877B-D
Genre: Journal Article

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Gerhard, HE1, 2, Author              
Wichmann, FA3, Author              
Bethge, M1, 2, Author              
Affiliations:
1Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497805              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              
3Dept. Empirical Inference, Max Planck Institute for Intelligent Systems, Max Planck Society, DE, ou_1497647              

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 Abstract: A key hypothesis in sensory system neuroscience is that sensory representations are adapted to the statistical regularities in sensory signals and thereby incorporate knowledge about the outside world. Supporting this hypothesis, several probabilistic models of local natural image regularities have been proposed that reproduce neural response properties. Although many such physiological links have been made, these models have not been linked directly to visual sensitivity. Previous psychophysical studies of sensitivity to natural image regularities focus on global perception of large images, but much less is known about sensitivity to local natural image regularities. We present a new paradigm for controlled psychophysical studies of local natural image regularities and compare how well such models capture perceptually relevant image content. To produce stimuli with precise statistics, we start with a set of patches cut from natural images and alter their content to generate a matched set whose joint statistics are equally likely under a probabilistic natural image model. The task is forced choice to discriminate natural patches from model patches. The results show that human observers can learn to discriminate the higher-order regularities in natural images from those of model samples after very few exposures and that no current model is perfect for patches as small as 5 by 5 pixels or larger. Discrimination performance was accurately predicted by model likelihood, an information theoretic measure of model efficacy, indicating that the visual system possesses a surprisingly detailed knowledge of natural image higher-order correlations, much more so than current image models. We also perform three cue identification experiments to interpret how model features correspond to perceptually relevant image features.

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 Dates: 2013-01
 Publication Status: Published online
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 Identifiers: DOI: 10.1371/journal.pcbi.1002873
eDoc: e1002873
BibTex Citekey: GerhardWB2013
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Title: PLoS Computational Biology
Source Genre: Journal
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Pages: - Volume / Issue: 9 (1) Sequence Number: - Start / End Page: 1 - 15 Identifier: -