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Electrophysiological evidence for a self-processing advantage during audiovisual speech integration
Avril Treille1,2, Coriandre Vilain3, Sonia Kandel3
1GIPSA-lab, Département Parole & Cognition, CNRS & Grenoble Université, Grenoble, France. avril.treille@gipsa-lab.grenoble-inp.fr.
Experimental Brain Research
|July 6, 2017
Summary
Hearing and seeing your own speech movements, unlike another speaker's, temporally facilitates audiovisual speech perception. This self-knowledge enhances sensory integration, improving how we process speech signals.
Area of Science:
- Neuroscience
- Cognitive Science
- Speech Perception
Background:
- Electrophysiological studies confirm early multisensory integration in audiovisual speech.
- A key question is whether self-perception (own voice/gestures) enhances speech processing via sensory-motor knowledge.
Purpose of the Study:
- To investigate the impact of self-knowledge on audiovisual speech perception using EEG.
- To determine if perceiving one's own voice and articulatory movements facilitates speech perception.
Main Methods:
- EEG was used to record brain activity during auditory (A), visual (V), and audiovisual (AV) speech perception.
- Stimuli were either self-recorded or recorded from an unfamiliar speaker.
- Audiovisual interactions were assessed by comparing evoked potentials (N1, P2) in AV vs. A+V conditions.
Main Results:
- A decrease in P2 auditory evoked potentials was observed in AV compared to A+V conditions, consistent with prior research.
- A significant temporal facilitation of N1 responses occurred during visual perception of self-speech movements versus another speaker's.
- This N1 facilitation correlated negatively with visual stimulus saliency.
Conclusions:
- Self-knowledge, specifically seeing one's own speech gestures, provides a temporal facilitation in integrating auditory and visual speech signals.
- This finding supports the role of personal sensory-motor knowledge in enhancing audiovisual speech perception.
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