| Lateral interactions across space reveal links between processing streams for luminance-modulated and contrast-modulated stimuli. | |
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MedLine Citation:
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PMID: 20171979 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Foveal detection thresholds for luminance-modulated (LM) and contrast-modulated (CM) blobs in the presence of fixed modulation, laterally placed noise blobs (separations of 0-6 degrees ) were measured in four observers with normal vision. Detection thresholds measured for LM blobs placed between highly visible LM flankers (111) and for CM blobs placed between highly visible CM flankers (222) produces a similar pattern of lateral interaction effects, i.e. masking where the stimuli overlap and facilitation for separations of 4-8x blob sd units. The region of facilitation is not matched by shallow psychometric function slopes. Detection thresholds measured for LM blobs placed between highly visible CM flankers (212) are generally facilitatory but relatively raised for separations of 0.5-2 degrees . For CM blobs placed between highly visible LM flankers (121), facilitation is stronger in the 0.5-2 degrees region. A significant correlation between thresholds and psychometric function slopes is found only for the 212 condition. We propose a model with two separate but interacting processing streams for the detection of LM and CM targets that may engage different cortical loci. |
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Authors:
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Mohd Izzuddin Hairol; Sarah J Waugh |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-19 |
Journal Detail:
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Title: Vision research Volume: 50 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2010 Apr |
Date Detail:
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Created Date: 2010-03-29 Completed Date: - 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: 889-903 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Anglia Vision Research, Anglia Ruskin University, Cambridge CB1 1PT, UK. izzuddin.hairol@anglia.ac.uk |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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