| Cognitive neurophysiology: beyond averaging. | |
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MedLine Citation:
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PMID: 17716919 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Averaging of repeated responses to sensory stimuli is the standard approach in cognitive electrophysiology. This procedure can give rise to inappropriate interpretations in some situations, because two factors contribute to the average ERP responses: the amplitude of the responses during the individual experimental trials, and the concentration of the phases (phase-locking) across responses. Larger poststimulus single-trial amplitudes compared to prestimulus baseline are thought to correspond to a stimulus-related increase of postsynaptic potentials or/and activation of an increased amount of neural assemblies. But the functional interpretation of an enhanced inter-trial phase-locking is unclear. BOLD responses are probably related to single-trial EEG amplitudes, but not to the phase concentration across trials. Therefore, separation of amplitude and phase contributions is indispensable to avoid misinterpretations and to gain a deeper understanding of the relation between event-related EEG and fMRI. |
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Authors:
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Juergen Fell |
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Publication Detail:
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Type: Journal Article Date: 2007-08-02 |
Journal Detail:
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Title: NeuroImage Volume: 37 ISSN: 1053-8119 ISO Abbreviation: Neuroimage Publication Date: 2007 Oct |
Date Detail:
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Created Date: 2007-09-17 Completed Date: 2007-11-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9215515 Medline TA: Neuroimage Country: United States |
Other Details:
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Languages: eng Pagination: 1069-72 Citation Subset: IM |
Affiliation:
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Department of Epileptology, University of Bonn, Sigmund-Freud Str. 25, D-53105 Bonn, Germany. juergen.fell@ukb.uni-bonn.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Cognition
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physiology* Data Interpretation, Statistical Electroencephalography / statistics & numerical data Epilepsy / diagnosis Evoked Potentials / physiology Humans Magnetic Resonance Imaging Neurophysiology / statistics & numerical data*, trends* Oxygen / blood |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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