| Spatial contrast sensitivity in dynamic and static additive luminance noise. | |
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MedLine Citation:
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PMID: 20638404 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of this study was to define the quantitative relationship between the temporal characteristics of additive luminance noise and the properties of the spatial contrast sensitivity function (CSF). CSFs were obtained from two observers using Gabor patch targets of short duration that were added to white luminance noise with a range of root-mean-square contrasts (c(rms)). The noise was either dynamic or static and was either of the same duration as the test target (synchronous) or of longer duration (asynchronous). For targets presented in asynchronous dynamic, synchronous dynamic, and synchronous static noise, the CSFs became increasingly band-pass with increasing c(rms), whereas the CSFs were low-pass at all levels of c(rms) for targets presented in asynchronous static noise. For all noise types, the properties of the CSFs were well-predicted by the linear amplifier model (LAM), in which the signal energy at threshold (E(t)) is related linearly to noise spectral density (N). The fundamentally different characteristics of CSFs obtained in asynchronous static noise can be accounted for by a previous proposal that this noise type biases contrast sensitivity toward transient (inferred magnocellular) mechanisms. The other three modes of noise presentation appear to emphasize detection by sustained (inferred parvocellular) mechanisms. |
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Authors:
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J Jason McAnany; Kenneth R Alexander |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't Date: 2010-07-16 |
Journal Detail:
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Title: Vision research Volume: 50 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-23 Completed Date: 2011-06-28 Revised Date: 2012-04-26 |
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: 1957-65 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, 1855 W. Taylor St., Chicago, IL 60612, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Contrast Sensitivity / physiology* Humans Light* Middle Aged Photic Stimulation / methods Psychophysics Sensory Thresholds / physiology |
| Grant Support | |
ID/Acronym/Agency:
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EY001792/EY/NEI NIH HHS; EY008301/EY/NEI NIH HHS; EY019510/EY/NEI NIH HHS; K99 EY019510-01/EY/NEI NIH HHS; P30 EY001792-30/EY/NEI NIH HHS; P30 EY001792-33/EY/NEI NIH HHS; R01 EY008301-19/EY/NEI NIH HHS |
| Comments/Corrections | |
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