| Transitions in neural oscillations reflect prediction errors generated in audiovisual speech. | |
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MedLine Citation:
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PMID: 21552273 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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According to the predictive coding theory, top-down predictions are conveyed by backward connections and prediction errors are propagated forward across the cortical hierarchy. Using MEG in humans, we show that violating multisensory predictions causes a fundamental and qualitative change in both the frequency and spatial distribution of cortical activity. When visual speech input correctly predicted auditory speech signals, a slow delta regime (3-4 Hz) developed in higher-order speech areas. In contrast, when auditory signals invalidated predictions inferred from vision, a low-beta (14-15 Hz) / high-gamma (60-80 Hz) coupling regime appeared locally in a multisensory area (area STS). This frequency shift in oscillatory responses scaled with the degree of audio-visual congruence and was accompanied by increased gamma activity in lower sensory regions. These findings are consistent with the notion that bottom-up prediction errors are communicated in predominantly high (gamma) frequency ranges, whereas top-down predictions are mediated by slower (beta) frequencies. |
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Authors:
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Luc H Arnal; Valentin Wyart; Anne-Lise Giraud |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-08 |
Journal Detail:
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Title: Nature neuroscience Volume: - ISSN: 1546-1726 ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9809671 Medline TA: Nat Neurosci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Inserm U960 - École Normale Supérieure, Paris, France. |
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