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• W4387311877 abstract "We used MEG and fMRI to determine how predictions are combined with speech input in superior temporal cortex. We compared neural responses to bisyllabic spoken words in which the first syllable strongly or weakly predicts the form of the second syllable (e.g. Bingo versus Tango). We further compared neural responses to the same second syllables when heard in an unfamiliar pseudoword and therefore in a situation in which predictions mismatch with sensory input (e.g. Snigo and Meago). Across multiple imaging modalities and analysis approaches (including information-based pattern analysis methods), we show that neural representations of second syllables are suppressed by strong predictions when predictions match sensory input. However, neural representations of the same second syllables show the opposite effect (i.e. enhanced representations following strongly than weakly-predicting syllables) when predictions mismatch with sensory input. Computational simulations show that this interaction between prediction strength and (mis)match is consistent with prediction error but not alternative (sharpened signal) computations. Neural signatures of prediction error are observed early (beginning 200 ms after the onset of the second syllable), localise to early auditory regions (in fMRI, bilateral Heschls gyrus and STG) and are expressed as changes in low-frequency (theta and alpha) power. Finally, we show that even a non-speech noise that replaces a predicted second syllable can evoke informative neural activity patterns, consistent with negative prediction errors. Our study therefore provides convergent neural evidence that speech perception is supported by the computation of prediction errors in auditory brain regions. These prediction error computations play a central role in the identification of familiar spoken words and perception of unfamiliar pseudowords." @default.
• W4387311877 created "2023-10-04" @default.
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• W4387311877 date "2023-10-03" @default.
• W4387311877 modified "2023-10-18" @default.
• W4387311877 title "Convergent neural signatures of speech prediction error across space, time and frequency" @default.
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• W4387311877 doi "https://doi.org/10.1101/2023.10.03.560649" @default.
• W4387311877 hasPublicationYear "2023" @default.
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