| Thresholds for the identification of the direction of motion of plaid patterns defined by luminance or chromatic contrast. | |
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MedLine Citation:
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PMID: 9624437 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Contrast thresholds for identification of the direction of motion were determined for sinusoidal gratings and plaid patterns moving in eight possible directions. Since plaid patterns are the sum of two component gratings, a prediction of the thresholds for plaids can be made by assuming that the motions of both component gratings are independently identified (probability summation). In agreement with standard two-stage models of plaid perception, our results show that for stimuli defined by luminance contrast, plaid direction thresholds can be predicted well from the component thresholds. This also holds for fast-moving isoluminant plaid patterns, but for slowly moving (< 4 Hz) isoluminant plaids, direction thresholds were substantially higher than the prediction from the components. In the latter case, subjects frequently were unable to identify the motion of the plaid in the pattern direction, even when the direction of motion of both components could be reliably identified. Different mechanisms might underlie the perception of luminance and isoluminant plaids at slow speeds. |
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Authors:
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K R Gegenfurtner |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Vision research Volume: 38 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1998 Mar |
Date Detail:
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Created Date: 1998-06-22 Completed Date: 1998-06-22 Revised Date: 2006-11-15 |
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: 881-8 Citation Subset: IM; S |
Affiliation:
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Max-Planck-Institute für biologische Kybernetik, Tübingen, Germany. karl@mpik-tueb.mpg.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Color Perception
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physiology Contrast Sensitivity / physiology* Humans Light Male Mathematics Motion Perception / physiology* Pattern Recognition, Visual / physiology* Rotation Sensory Thresholds / physiology Time Factors |
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