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Neural Activity During Audiovisual Speech Processing: Protocol For a Functional Neuroimaging Study.

András Bálint^1,2, Wilhelm Wimmer^1,2, Marco Caversaccio^1,2

¹Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.

JMIR Research Protocols

|June 21, 2022

Summary

This summary is machine-generated.

This study develops a controlled audiovisual speech task using functional near-infrared spectroscopy (fNIRS) to better understand brain changes in hearing impairment and cochlear implant users.

Keywords:

brain brain activation brain activity brain plasticity cochlear cochlear implant comprehension cortical activation functional near-infrared spectroscopy (fNIRS)hearing hearing impairment hearing loss neural neuroimaging protocol spectroscopy speech speech understanding

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Area of Science:

Neuroscience
Audiology
Medical Imaging

Background:

Functional near-infrared spectroscopy (fNIRS) studies show links between hearing and brain plasticity post-cochlear implantation.
Inconsistent fNIRS results highlight the need for controlled neuroimaging tasks.
Careful planning is crucial for understanding brain changes related to hearing loss.

Purpose of the Study:

Develop a controlled audiovisual speech comprehension task using fNIRS.
Investigate brain activation in normal-hearing and hearing-impaired individuals, including cochlear implant users.
Ensure the task is reproducible, clinically relevant, and maximizes brain signal detection.

Main Methods:

A 5-minute resting state followed by two 12-minute stimulation periods.
Presentation of 13-second video clips from the Oldenburg Sentence Test (OLSA) in quiet, noise, lipreading, and audiovisual conditions.
Counterbalanced block design with 10 repetitions per condition, monitored by comprehension questions and 3D optode digitization.

Main Results:

Study protocol reported, with enrollment starting August 2021.
First results anticipated by the end of 2022.
This paper details the study protocol, not preliminary findings.

Conclusions:

The developed task will clarify neural mechanisms of speech understanding.
Findings will offer insights into brain plasticity in hearing-impaired individuals beyond clinical standards.
The study aims to improve cochlear implantation criteria and rehabilitation planning.