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Competing influence of visual speech on auditory neural adaptation
1Laboratoire Parole et Langage, Centre National de la Recherche Scientifique, UMR 7309 CNRS & Aix-Marseille Université, Aix-Marseille Université, 5 avenue Pasteur, Aix-en-Provence, France.
Brain and Language
|November 11, 2023
Summary
Visual speech influences auditory memory, with audiovisual input showing competing effects. This study used EEG to examine neural adaptation to auditory syllables following different speech presentations.
Area of Science:
- Neuroscience
- Cognitive Science
- Speech Processing
Background:
- Visual speech information enhances auditory neural processing and speech recognition.
- Previous research indicates visual cues impact auditory perception.
Purpose of the Study:
- To investigate if visual speech influences auditory memory.
- To examine auditory neural adaptation under different preceding speech conditions (auditory, visual, audiovisual).
Main Methods:
- Electroencephalography (EEG) was used to measure auditory evoked responses (N1, P2, N2).
- Participants listened to an auditory syllable preceded by auditory, visual, or audiovisual syllables.
Main Results:
- Stronger neural adaptation was observed for auditory-evoked responses when preceded by an auditory syllable compared to a visual syllable.
- Lower adaptation occurred with audiovisual preceding syllables compared to auditory-only, with longer N1 and P2 latencies.
- Visual speech demonstrably affects auditory memory, but audiovisual stimulation presents competing influences.
Conclusions:
- Visual speech significantly impacts auditory memory traces.
- Audiovisual speech stimulation involves complex interactions, suggesting competing visual influences on auditory processing.
