A Dynamic Neural Field Model of Visual Working Memory and Change Detection |
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| Authors: | Jeffrey S. Johnson,John P. Spencer,Steven J. Luck, Gregor Schö ner |
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| Affiliation: | Department of Psychology, University of Wisconsin–Madison;;Department of Psychology, University of Iowa;;The Iowa Center for Developmental and Learning Sciences, University of Iowa;;Center for Mind and Brain, University of California, Davis;;Department of Psychology, University of California, Davis;and;Institut für Neuroinformatik, Ruhr-University |
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| Abstract: | ABSTRACT— Efficient visually guided behavior depends on the ability to form, retain, and compare visual representations for objects that may be separated in space and time. This ability relies on a short-term form of memory known as visual working memory. Although a considerable body of research has begun to shed light on the neurocognitive systems subserving this form of memory, few theories have addressed these processes in an integrated, neurally plausible framework. We describe a layered neural architecture that implements encoding and maintenance, and links these processes to a plausible comparison process. In addition, the model makes the novel prediction that change detection will be enhanced when metrically similar features are remembered. Results from experiments probing memory for color and for orientation were consistent with this novel prediction. These findings place strong constraints on models addressing the nature of visual working memory and its underlying mechanisms. |
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