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Transitions in neural oscillations reflect prediction errors generated in audiovisual speech

Arnal, Luc H
Wyart, Valentin
Published in Nature Neuroscience. 2011, vol. 14, no. 6, p. 797-801
Abstract 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.
Keywords AdultAuditory Perception/physiologyCerebral Cortex/physiologyFemaleHumansMagnetoencephalographyMaleMiddle AgedNeural PathwaysSpeech/physiologyVisual Perception/physiology
PMID: 21552273
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ARNAL, Luc H, WYART, Valentin, GIRAUD MAMESSIER, Anne-Lise. Transitions in neural oscillations reflect prediction errors generated in audiovisual speech. In: Nature Neuroscience, 2011, vol. 14, n° 6, p. 797-801. doi: 10.1038/nn.2810

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Deposited on : 2013-01-22

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