| Evoked-potential changes following discrimination learning involving complex sounds. | |
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MedLine Citation:
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PMID: 21958655 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVE: Perceptual sensitivities are malleable via learning, even in adults. We trained adults to discriminate complex sounds (periodic, frequency-modulated sweep trains) using two different training procedures, and used psychoacoustic tests and evoked potential measures (the N1-P2 complex) to assess changes in both perceptual and neural sensitivities. METHODS: Training took place either on a single day, or daily across eight days, and involved discrimination of pairs of stimuli using a single-interval, forced-choice task. In some participants, training started with dissimilar pairs that became progressively more similar across sessions, whereas in others training was constant, involving only one, highly similar, stimulus pair. RESULTS: Participants were better able to discriminate the complex sounds after training, particularly after progressive training, and the evoked potentials elicited by some of the sounds increased in amplitude following training. Significant amplitude changes were restricted to the P2 peak. CONCLUSIONS: Our findings indicate that changes in perceptual sensitivities parallel enhanced neural processing. SIGNIFICANCE: These results are consistent with the proposal that changes in perceptual abilities arise from the brain's capacity to adaptively modify cortical representations of sensory stimuli, and that different training regimens can lead to differences in cortical sensitivities, even after relatively short periods of training. |
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Authors:
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Itzel Orduña; Estella H Liu; Barbara A Church; Ann C Eddins; Eduardo Mercado |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-9-27 |
Journal Detail:
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Title: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology Volume: - ISSN: 1872-8952 ISO Abbreviation: - Publication Date: 2011 Sep |
Date Detail:
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Created Date: 2011-9-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100883319 Medline TA: Clin Neurophysiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved. |
Affiliation:
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University at Buffalo, The State University of New York, United States. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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