The countervailing forces of selection and binding in vision
Item
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Title
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The countervailing forces of selection and binding in vision
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Identifier
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d_2009_2013:4b122e4c9cb1:11111
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identifier
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11351
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Creator
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Snyder, Adam Christopher,
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Contributor
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John J. Foxe
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Date
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2011
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Language
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English
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Publisher
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City University of New York.
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Subject
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Cognitive psychology | Neurosciences | Physiological psychology | Attention | Binding | EEG | Features | Oscillations | Selection
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Abstract
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Humans have limited cognitive resources to process the nearly limitless information available in the environment. Endogenous, or "top-down", selective attention to basic visual features such as color or motion is a common strategy for biasing resources in favor of the most relevant information sources in a given context. Opposing this top-down separation of features is a "bottom-up" tendency to integrate, or bind, the various features that constitute objects. First we identify an electrophysiological signature of endogenous selective attention to basic visual features: alpha-band power increases, which have been shown to reflect suppression of potentially distracting information in several contexts. Next, we pitted the two processes of selective attention and binding against each other in a series of behavioral and electrophysiological experiments to test if top-down selective attention can overcome constitutive binding processes. Our results demonstrate that bottom-up binding processes can dominate top-down feature-based attention even when explicitly detrimental to task performance. A model for anatomical bases and temporal dynamics of the deployment of feature-based selective attention is proposed.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Psychology
