Rapid computations of spectrotemporal prediction error support perception of degraded speech.

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

SUBMITTER: Sohoglu E 

PROVIDER: S-EPMC7641582 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature