Cortical structure predicts success in performing musical transformation judgments

Area of Science:

• Neuroscience
• Auditory Perception
• Neuroanatomy

Background:

• Relative pitch, the ability to identify melodies by their interval structure, is key to musical recognition.
• Previous studies suggest anatomical differences in the right auditory cortex (AC) and anterior intraparietal sulcus (IPS) in musicians.
• A functional link between relative pitch and the anterior IPS has been previously observed.

Purpose of the Study:

• To investigate the relationship between cortical structure variations in the AC and IPS and relative pitch ability.
• To determine if anatomical differences predict performance on relative pitch tasks.

Main Methods:

• Utilized magnetic resonance imaging (MRI) with cortical thickness (CT) analysis and voxel-based morphometry (VBM).
• Assessed participants with varying musical training on a melody transposition task and control tasks (musical and speech).

Main Results:

• Gray matter concentration and cortical thickness in the right Heschl's sulcus and bilateral IPS predicted relative pitch performance.
• These structural variations also correlated with musical control tasks, but less strongly.
• After accounting for musical training, only relative pitch performance remained predicted by cortical structure in these areas.

Conclusions:

• Demonstrates the functional significance of anatomical differences in the auditory cortex of musicians.
• Provides evidence for a multimodal network in the IPS involved in processing auditory information and transformations.