| Imperceptibly rapid contrast modulations processed in cortex: Evidence from psychophysics. | |
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MedLine Citation:
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PMID: 20884596 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Rapid fluctuations in contrast are common in our modern visual environment. They arise, for example, in a room lit by a fluorescent light, when viewing a CRT computer monitor and when watching a movie in a cinema. As we are unconscious of the rapid changes, it has been assumed that they do not affect the operation of our visual systems. By periodically reversing the contrast of a fixed pattern at a rapid rate we render the pattern itself, as well as the modulations, invisible to observers. We show that exposure to these rapidly contrast-modulated patterns alters the way subsequent stationary patterns are processed; patterns similar to the contrast-modulated pattern require more contrast to be detected than dissimilar patterns. We present evidence that the changes are cortically mediated. Taken together, our findings suggest that cortical stages of the visual system respond to the individual frames of a contrast-reversed sequence, even at rates as high as 160 frames per second. |
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Authors:
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Michael Falconbridge; Adam Ware; Donald I A MacLeod |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2010-07-01 |
Journal Detail:
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Title: Journal of vision Volume: 10 ISSN: 1534-7362 ISO Abbreviation: J Vis Publication Date: 2010 |
Date Detail:
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Created Date: 2010-10-04 Completed Date: 2011-03-17 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 101147197 Medline TA: J Vis Country: United States |
Other Details:
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Languages: eng Pagination: 21 Citation Subset: IM |
Affiliation:
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Psychology Department, UC San Diego, La Jolla, CA 92093-0109, USA. mickfalconbridge@hotmail.com |
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* Humans Light Pattern Recognition, Visual / physiology* Photic Stimulation / methods Psychophysics / methods* Sensory Thresholds / physiology* Visual Cortex / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY001711-34/EY/NEI NIH HHS; R01 EY001711-35/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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