| Differential roles of contrast polarity reveal two streams of second-order visual processing. | |
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MedLine Citation:
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PMID: 17555787 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Humans can easily segregate texture regions based on differences in contrast, orientation, and contrast polarity. It has been suggested that these abilities can be inclusively modeled by 2nd-order visual mechanisms that detect changes in the half-wave rectified outputs of orientation-selective filters. Using a subthreshold-summation paradigm, however, we show that modulations of contrast polarity are detected by mechanisms that pool signals of different orientations while modulations of orientation are detected by mechanisms that pool signals of different contrast polarities. The results support the existence of two streams of 2nd-order processing, one that receives the full-wave rectified inputs from oriented filters, the other separate half-wave rectified outputs from on-center and off-center filters pooled across all orientations. The two-stream model is shown to predict the perceptual effects of changes to the skewness statistics of natural-image textures, and to solve a contradiction among previous data concerning the detection of contrast modulation. |
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Authors:
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Isamu Motoyoshi; Frederick A A Kingdom |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2007-06-06 |
Journal Detail:
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Title: Vision research Volume: 47 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-06-19 Completed Date: 2007-08-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0417402 Medline TA: Vision Res Country: England |
Other Details:
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Languages: eng Pagination: 2047-54 Citation Subset: IM |
Affiliation:
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Human and Information Science Laboratory, NTT Communication Science Laboratories, NTT 3-1 Morinosato-Wakamiya, Atsugi 243-0198, Japan. motoyosi@apollo3.brl.ntt.co.jp |
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| MeSH Terms | |
Descriptor/Qualifier:
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Contrast Sensitivity
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physiology* Humans Models, Psychological Pattern Recognition, Visual / physiology* Photic Stimulation / methods Psychophysics Sensory Thresholds / physiology Visual Pathways / physiology* |
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