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Characterizing Variability of Audiovisual Speech Perception Based on Periodic and Aperiodic Features of Prestimulus Brain Activity

Vinsea A V Singh, Vinodh G Kumar, Arpan Banerjee, View ORCID ProfileDipanjan Roy
doi: https://doi.org/10.1101/2022.01.20.477172
Vinsea A V Singh
1Cognitive Brain Dynamics Lab, National Brain Research Centre, NH-8, Manesar, Gurugram, 122052, India
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Vinodh G Kumar
1Cognitive Brain Dynamics Lab, National Brain Research Centre, NH-8, Manesar, Gurugram, 122052, India
2Department of Neurology, Penn State College of Medicine Hershey, Pennsylvania, 17033, U.S.A.
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Arpan Banerjee
1Cognitive Brain Dynamics Lab, National Brain Research Centre, NH-8, Manesar, Gurugram, 122052, India
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Dipanjan Roy
1Cognitive Brain Dynamics Lab, National Brain Research Centre, NH-8, Manesar, Gurugram, 122052, India
3School of AIDE, Center for Brain Research and Applications, Indian Institute of Technology (IIT) Jodhpur 342037, India
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  • ORCID record for Dipanjan Roy
  • For correspondence: droy@iitj.ac.in
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Abstract

Burgeoning pieces of evidence support the idea that differences in the properties of large-scale cortical networks underlie perceptual variability. Here, employing psychophysical experiments in tandem with electroencephalogram (EEG) recordings, we explored the inter-individual and inter-trial differences in McGurk percept to probe the underlying brain dynamics before (prestimulus) and after (poststimulus) the stimulus presentation. Initially, based on our participants’ (n = 18) overall susceptibility to the McGurk effect, we categorized them into two groups - ’rare’ and ’frequent’ groups of perceivers. Subsequently, we investigated the differences in their neuronal dynamics manifested in the oscillatory properties of the prestimulus and compared it with the poststimulus EEG signals during the McGurk perception (audio- /pa/, video- /ka/) and, also during the perception of the congruent audiovisual (AV) stimuli (syllables /pa/, /ta/, and /ka/). We primarily focused on the power spectrum components (periodic oscillations and aperiodic components) and global coherence. At the inter-individual and inter-trial level, we observed that for the prestimulus duration, the ’rare’ perceivers’ aperiodic (or “background” 1/f) component elicited a lower beta band (15-30 Hz) and gamma band (31-45 Hz) activity than the ’frequent’ group of perceivers. Moreover, the periodic oscillations for the ’rare’ group showed significance in the alpha (8-12 Hz) and beta bands during the prestimulus time window. ’Rare’ perceivers also showed an increased global coherence in the theta (4-7 Hz), alpha, and beta bands but a lower gamma band activity than the ’frequent’ perceivers. Finally, ’rare’ perceivers elicited higher cross-hemispheric connectivity (imaginary coherence) than the ’frequent’ group at the source across different frequency bands, supporting the notion that the fluctuations in the distributed large-scale network underlie the perceptual variability in speech across individuals.

Competing Interest Statement

The authors have declared no competing interest.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted January 22, 2022.
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Characterizing Variability of Audiovisual Speech Perception Based on Periodic and Aperiodic Features of Prestimulus Brain Activity
Vinsea A V Singh, Vinodh G Kumar, Arpan Banerjee, Dipanjan Roy
bioRxiv 2022.01.20.477172; doi: https://doi.org/10.1101/2022.01.20.477172
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Characterizing Variability of Audiovisual Speech Perception Based on Periodic and Aperiodic Features of Prestimulus Brain Activity
Vinsea A V Singh, Vinodh G Kumar, Arpan Banerjee, Dipanjan Roy
bioRxiv 2022.01.20.477172; doi: https://doi.org/10.1101/2022.01.20.477172

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