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Cortical Morphological Changes in Congenital Amusia: Surface-Based Analyses.

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|January 31, 2022
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Summary

Congenital amusia (CA) is linked to distinct cortical changes in the right hemisphere, specifically in the middle frontal and pars triangularis gyri. These structural differences may serve as neural markers for amusia, impacting pitch perception and memory.

Keywords:
congenital amusiamiddle frontal gyrusmusic discriminationpars triangularis gyrusstructural magnetic resonance imagingsurface-based morphology

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Area of Science:

  • Neuroscience
  • Neuroimaging
  • Auditory Perception

Background:

  • Congenital amusia (CA) is a rare disorder affecting pitch perception.
  • Previous studies utilized MRI, but vertex-based surface morphology analysis for CA remains underexplored.
  • Understanding the neural underpinnings of CA is crucial for diagnosis and potential interventions.

Purpose of the Study:

  • To investigate cortical morphological differences in individuals with congenital amusia using surface-based analysis.
  • To identify specific brain regions associated with amusia deficits.
  • To explore the correlation between cortical morphology and amusia severity.

Main Methods:

  • Structural MRI scans were acquired from 15 participants with CA and 13 healthy controls.
  • Surface-based morphology analysis was employed to detect vertex-level abnormalities.
  • Pearson's correlation analysis examined the relationship between amusia scores (MBEA) and surface parameters.

Main Results:

  • Participants with CA showed significantly lower Montreal Battery of Evaluation of Amusia (MBEA) scores.
  • The CA group exhibited higher fractal dimension in the right caudal middle frontal gyrus and lower sulcal depth in the right pars triangularis gyrus.
  • Negative correlations were found between right caudal middle frontal gyrus fractal dimension and MBEA scores; positive correlations were observed between right pars triangularis gyrus sulcal depth and MBEA scores.

Conclusions:

  • Individuals with CA display significant cortical morphological alterations in the right hemisphere.
  • Abnormalities in the right pars triangularis gyrus and middle frontal gyrus are associated with the neural basis of amusia.
  • These identified cortical changes may serve as potential neural markers for congenital amusia.