Auditory and semantic processing of speech-in-noise in autism: a behavioural and EEG study

Li, J., Sujawal, M., Bernotaite, Z., Cunnings, I. ORCID: https://orcid.org/0000-0002-5318-0186 and Liu, F. ORCID: https://orcid.org/0000-0002-7776-0222 (2025) Auditory and semantic processing of speech-in-noise in autism: a behavioural and EEG study. Autism Research, 18 (10). pp. 2011-2030. ISSN 1939-3806 doi: 10.1002/aur.70097

Abstract/Summary

Autistic individuals often struggle to recognize speech in noisy environments, but the neural mechanisms behind these challenges remain unclear. Effective speech-in-noise (SiN) processing relies on auditory processing, which tracks target sounds amidst noise, and semantic processing, which further integrates relevant acoustic information to derive meaning. This study examined these two processes in autism. Thirty-one autistic and 31 non-autistic adults completed a sentence judgment task under three conditions: quiet, babble noise, and competing speech. Auditory processing was measured using EEG-derived temporal response functions (TRFs), which tracked how the brain follows speech sounds, while semantic processing was assessed via behavioral accuracy and the N400 component, a neural marker of semantic processing. Autistic participants showed reduced TRF responses and delayed N400 onset, indicating less efficient auditory processing and slower semantic processing, despite similar N400 amplitude and behavioral performance. Moreover, non-autistic participants demonstrated a trade-off between auditory and semantic processing resources. In the competing speech condition, they showed enhanced semantic integration but reduced neural tracking of auditory information when managing linguistic competition introduced by intelligible speech noise. In contrast, the autistic group showed no modulation of neural responses, suggesting reduced flexibility in adjusting auditory and semantic demands. These findings highlight distinct neural processing patterns in autistic individuals during SiN tasks, providing new insights into how atypical auditory and semantic processing shape SiN perception in autism.

Item Type	Article
URI	https://centaur.reading.ac.uk/id/eprint/123671
Identification Number/DOI	10.1002/aur.70097
Refereed	Yes
Divisions	Interdisciplinary Research Centres (IDRCs) > Centre for Integrative Neuroscience and Neurodynamics (CINN) Interdisciplinary centres and themes > ASD (Autism Spectrum Disorders) Research Network Life Sciences > School of Psychology and Clinical Language Sciences > Department of Psychology Life Sciences > School of Psychology and Clinical Language Sciences > Neuroscience Life Sciences > School of Psychology and Clinical Language Sciences > Department of Clinical Language Sciences Life Sciences > School of Psychology and Clinical Language Sciences > Language and Cognition
Publisher	John Wiley
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