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| Research article summary (published 29 Apr 2003): |
Orientation discrimination in visual noise using global and local stimuli.
Full Abstract
We have investigated orientation discrimination in visual noise using two types of high contrast, broadband stimuli. Discrimination thresholds are better for Local stimuli, in which the orientation signal is spatially limited, than for Global stimuli, in which the orientation signal extends across the entire stimulus. Performance improves with increasing stimulus area, reaching an optimum threshold of about 11% orientation signal. Thresholds were not influenced by brief presentation times or practice. These results, along with results from a simple computational model, suggest that human orientation discrimination for this kind of pattern is mediated by pooling local responses of low-level neural mechanisms and is limited by two stages of intrinsic neural noise.
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Author information
Author/s: Jones, David G (DG); Anderson, Nicole D (ND); Murphy, Kathryn M (KM);
Affiliation: Department of Electrical and Computer Engineering, McMaster University, 1280 Main Street West, Ont., L8S 4K1, Hamilton, Canada. djones(-atsign-)mcmaster.ca
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Vision research (Vision Res), published in England. (Language: eng)
Reference: 2003-May; vol 43 (issue 11) : pp 1223-33
Dates: Created 2003/05/02; Completed 2003/06/23; Revised 2006/11/15;
PMID: 12726829, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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