Auditory and Semantic Processing of Speech‐in‐Noise in Autism: A Behavioral and EEG Study

作者：Jiayin Li, Maleeha Sujawal, Zivile Bernotaite, Ian Cunnings, Fang Liu · 发表于：Autism Research · 年份：2025 · DOI：10.1002/aur.70097 · 被引用次数：3 · 研究领域：Medicine

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 dema...