| On the role of X and simple cells in human contrast processing. | |
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MedLine Citation:
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PMID: 8160384 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We investigated the potential role of retinal X and cortical simple cells in determining human psychophysical detection performance under contrast masking conditions. Since both X and simple cells exhibit a null phase, the phase of a background mask should affect the visibility of a test grating processed by such cells. Sinusoidal test gratings of either 1 or 7 c/deg were presented as a sustained or transient increment against a background mask of the same size and spatial frequency at either 0 or 90 deg phase. For background contrasts from 0.5% up to 40%, psychophysical contrast sensitivity was phase-independent for all conditions. Therefore, either (1) contrast threshold is mediated by cells with non-linear spatial summation properties, such as Y or complex cells, or (2) the masking effect of the background occurs after a phase-insensitive combination or pooling of simple cell responses in the cortex. |
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Authors:
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T B Lawton; C W Tyler |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Vision research Volume: 34 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1994 Mar |
Date Detail:
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Created Date: 1994-05-18 Completed Date: 1994-05-18 Revised Date: 2007-11-14 |
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: 659-67 Citation Subset: IM |
Affiliation:
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Nano Tech Services, Channel Islands Harbor, CA 93035. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Contrast Sensitivity
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physiology* Discrimination (Psychology) / physiology Humans Pattern Recognition, Visual / physiology Perceptual Masking / physiology Psychophysics Retina / physiology* Sensory Thresholds / physiology Visual Cortex / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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EY7890/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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