| Summation characteristics of the detection of compound gratings. | |
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MedLine Citation:
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PMID: 19460399 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Many classical experiments have shown that two superimposed gratings are more easily detected than a single grating, in keeping with probability theory. Here we test the rules for the detection of 2-component compound gratings by extending the range of parameters used in previous experiments. Two complementary methods of deriving summation indices are described. Data are presented so that the conditions for the transition from probability to neural summation are easily identified. True probability summation occurs only when grating contrasts are carefully perceptually equalised and spatial frequency differs by more than a factor of 2. A wide range of contrast ratios of the component gratings were explored such that gratings were at different contrasts, relative to respective thresholds. We find clear evidence of suppressive interactions when the compound gratings are composed of a close to threshold low frequency component and a below-threshold higher spatial frequency component. |
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Authors:
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S Plainis; N R A Parry; A Panorgias; P Sapountzis; I J Murray |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't Date: 2009-05-19 |
Journal Detail:
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Title: Vision research Volume: 49 ISSN: 1878-5646 ISO Abbreviation: Vision Res. Publication Date: 2009 Jul |
Date Detail:
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Created Date: 2009-07-21 Completed Date: 2009-10-09 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: 2056-66 Citation Subset: IM |
Affiliation:
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Institute of Vision and Optics (IVO), School of Health Sciences, University of Crete, Heraklion, Crete, Greece. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Contrast Sensitivity / physiology* Humans Middle Aged Motion Perception / physiology Pattern Recognition, Visual / physiology* Perceptual Masking Photic Stimulation Psychophysics Sensory Thresholds |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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