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• W4366279722 abstract "Abstract Observing lip movements of a speaker is known to facilitate speech understanding, especially in challenging listening situations. Converging evidence from neuroscientific studies shows enhanced processing of audiovisual stimuli. However, the interindividual variability of this visual benefit and its consequences on behavior are unknown. Here, we analyzed source-localized magnetoencephalographic (MEG) responses from normal-hearing participants listening to audiovisual speech with or without an additional distractor speaker. Using temporal response functions (TRFs), we show that neural responses to lip movements are, in general, enhanced when speech is challenging. After conducting a crucial control for speech acoustics, we show that lip movements effectively contribute to higher neural speech tracking, particularly when a distractor speaker is present. However, the extent of this visual benefit varied greatly among participants. Probing the behavioral relevance, we show that individuals who benefit more from lip movement information in terms of neural speech tracking, show a stronger drop in performance and an increase in perceived difficulty when the mouth is occluded by a surgical face mask. By contrast, no effect was found when the mouth was not occluded. We provide novel insights on how the benefit of lip movements in terms of neural speech tracking varies among individuals. Furthermore, we reveal its behavioral relevance by demonstrating negative consequences for behavior when visual speech is absent. Our results also offer potential implications for future objective assessments of audiovisual speech perception." @default.
• W4366279722 created "2023-04-20" @default.
• W4366279722 creator A5010510364 @default.
• W4366279722 creator A5011655083 @default.
• W4366279722 creator A5019402629 @default.
• W4366279722 creator A5020673840 @default.
• W4366279722 creator A5041184020 @default.
• W4366279722 creator A5053280575 @default.
• W4366279722 creator A5061258274 @default.
• W4366279722 creator A5066814527 @default.
• W4366279722 creator A5074661852 @default.
• W4366279722 creator A5089603745 @default.
• W4366279722 date "2023-04-18" @default.
• W4366279722 modified "2023-09-27" @default.
• W4366279722 title "Neural speech tracking benefit of lip movements predicts behavioral deterioration when the speaker’s mouth is occluded" @default.
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