Increased volume and function of right auditory cortex as a marker for absolute pitch

Area of Science:

• Neuroscience
• Auditory Perception
• Neuroimaging

Background:

• Absolute pitch (AP) is the rare ability to identify musical notes without a reference.
• Understanding the neural basis of AP is crucial for auditory neuroscience.
• Existing research often conflates AP with relative pitch or memory recall.

Purpose of the Study:

• To investigate the neural substrates underlying absolute pitch perception.
• To develop a novel behavioral test to quantify AP proficiency independently of memory and relative pitch.
• To differentiate the neural correlates of pitch perception versus pitch labeling.

Main Methods:

• Developed a novel behavioral test to assess AP proficiency.
• Utilized morphological and functional magnetic resonance imaging (fMRI) and magnetoencephalography.
• Compared brain structure and function in musicians with and without AP.

Main Results:

• Gray matter volume in the right Heschl's gyrus (HG) strongly correlated with AP proficiency.
• Increased right-hemispheric auditory evoked fields were observed in the AP group.
• fMRI identified an AP-dependent network involving right auditory and motor cortices, and left Broca's area.

Conclusions:

• The right HG may serve as an anatomical marker for absolute pitch.
• A right-hemispheric network appears critical for AP "perception."
• Pitch "labeling" in AP likely involves left-hemispheric language areas, specifically Broca's area.