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Functional Plasticity Coupled With Structural Predispositions in Auditory Cortex Shape Successful Music Category
Kelsey Mankel1,2,3, Utsav Shrestha4, Aaryani Tipirneni-Sajja4
1School of Communication Sciences and Disorders, University of Memphis, Memphis, TN, United States.
Frontiers in Neuroscience
|July 15, 2022
Summary
Auditory learning enhances sound categorization. Brief musical training improved sound identification, showing functional brain changes and structural differences in the auditory cortex.
Area of Science:
- Neuroscience
- Auditory Perception
- Neuroplasticity
Background:
- Categorizing sounds aids auditory scene processing and is crucial for speech and language.
- Understanding how the brain learns auditory categories, especially for non-speech sounds like music, is limited.
Purpose of the Study:
- To investigate neuroplastic changes associated with auditory categorical learning of musical sounds.
- To examine the relationship between behavioral performance, neural changes (EEG), and structural brain differences (MRI) after musical training.
Main Methods:
- Musically naïve participants underwent a short training session on a musical interval continuum (minor-major 3rds).
- Multichannel electroencephalography (EEG) recorded auditory event-related potentials (ERPs) before and after training.
- Structural magnetic resonance imaging (MRI) assessed Heschl's gyrus (HG) volume.
Main Results:
- Behavioral performance showed improved sound categorization after training, correlating with accuracy.
- Learners exhibited reduced P2 amplitudes in ERPs post-training, particularly in the right hemisphere.
- Structural analysis revealed smaller and thinner bilateral Heschl's gyri in participants with superior categorization.
Conclusions:
- Short-term functional changes in sensory coding efficiency occur with auditory categorical learning.
- Preexisting structural differences in the auditory cortex may support successful learning of music sounds.
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