Rapid computations of spectrotemporal prediction error support perception of degraded speech

Sohoglu, Ediz and Davis, Matthew H (2020) Rapid computations of spectrotemporal prediction error support perception of degraded speech. eLife, 9. a58077 1-25. ISSN 2050-084X

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Abstract

Human speech perception can be described as Bayesian perceptual inference but how are these Bayesian computations instantiated neurally? We used magnetoencephalographic recordings of brain responses to degraded spoken words and experimentally manipulated signal quality and prior knowledge. We first demonstrate that spectrotemporal modulations in speech are more strongly represented in neural responses than alternative speech representations (e.g. spectrogram or articulatory features). Critically, we found an interaction between speech signal quality and expectations from prior written text on the quality of neural representations; increased signal quality enhanced neural representations of speech that mismatched with prior expectations, but led to greater suppression of speech that matched prior expectations. This interaction is a unique neural signature of prediction error computations and is apparent in neural responses within 100 ms of speech input. Our findings contribute to the detailed specification of a computational model of speech perception based on predictive coding frameworks.

Item Type: Article
Schools and Departments: School of Psychology > Psychology
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 30 Oct 2020 08:37
Last Modified: 15 Mar 2021 12:31
URI: http://sro.sussex.ac.uk/id/eprint/94678

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