| A Model of Motion Transparency Processing with Local Center-Surround Interactions and Feedback. | |
MedLine Citation:
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PMID: 21851277 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Motion transparency occurs when multiple coherent motions are perceived in one spatial location. Imagine, for instance, looking out of the window of a bus on a bright day, where the world outside the window is passing by and movements of passengers inside the bus are reflected in the window. The overlay of both motions at the window leads to motion transparency, which is challenging to process. Noisy and ambiguous motion signals can be reduced using a competition mechanism for all encoded motions in one spatial location. Such a competition, however, leads to the suppression of multiple peak responses that encode different motions, as only the strongest response tends to survive. As a solution, we suggest a local center-surround competition for population-encoded motion directions and speeds. Similar motions are supported, and dissimilar ones are separated, by representing them as multiple activations, which occurs in the case of motion transparency. Psychophysical findings, such as motion attraction and repulsion for motion transparency displays, can be explained by this local competition. Besides this local competition mechanism, we show that feedback signals improve the processing of motion transparency. A discrimination task for transparent versus opaque motion is simulated, where motion transparency is generated by superimposing large field motion patterns of either varying size or varying coherence of motion. The model's perceptual thresholds with and without feedback are calculated. We demonstrate that initially weak peak responses can be enhanced and stabilized through modulatory feedback signals from higher stages of processing. |
Authors:
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Florian Raudies; Ennio Mingolla; Heiko Neumann |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-18 |
Journal Detail:
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Title: Neural computation Volume: - ISSN: 1530-888X ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-8-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9426182 Medline TA: Neural Comput Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Cognitive and Neural Systems, Boston University, Boston MA 02215 U.S.A. fraudies@bu.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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