Investigating Hemodynamic Patterns During Beat Processing in Cochlear Implant Users: Insights from a Finger Tapping...

Area of Science:

• Neuroscience
• Auditory Perception
• Human-Computer Interaction

Background:

• Cochlear implants (CIs) improve hearing but often impair music perception (melody, timbre).
• Beat and rhythm processing in CI users is less understood compared to individuals with normal hearing (NH).
• Investigating neural processing of auditory-motor synchronization in CI users is crucial for understanding music perception limitations.

Purpose of the Study:

• To compare beat processing neural networks between cochlear implant users and normal hearing listeners.
• To investigate if auditory-motor synchronization during rhythmic tasks elicits different brain activation patterns.
• To explore the neural basis of potential music appreciation differences in CI users.

Main Methods:

• Adapted finger tapping tasks (synchronization, syncopation) with auditory pacing and continuation phases.
• Functional near-infrared spectroscopy (fNIRS) to measure hemodynamic responses during tapping.
• Comparison of tapping performance and brain activation between CI users and NH listeners.

Main Results:

• Both CI users and NH listeners performed similarly on tapping tasks, with syncopated continuation being challenging for both.
• CI users demonstrated significantly more widespread hemodynamic activation across temporal, frontal, motor, and parietal regions compared to NH listeners.
• Despite performance similarities, neural recruitment differed between the two groups during beat processing.

Conclusions:

• Cochlear implant users utilize auditory-motor networks for beat processing, comparable to NH listeners.
• Widespread brain activation in CI users may stem from neural adaptation or increased listening effort.
• Further research is needed to fully understand the neural mechanisms underlying music perception in CI users.