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Larger Auditory Cortical Area and Broader Frequency Tuning Underlie Absolute Pitch.

Larissa McKetton1,2,3, Kevin DeSimone2,4,5, Keith A Schneider6,2,7

  • 1Department of Biology.

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|February 13, 2019
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Summary

Musicians with absolute pitch (AP) have larger auditory cortex areas with broader frequency tuning, suggesting enhanced neural processing for identifying musical tones. This finding clarifies the neural basis of AP abilities.

Keywords:
Heschl's gyrusabsolute pitchauditory cortexmusictonotopytuning sharpness

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Absolute pitch (AP) allows musicians to identify musical tones in isolation.
  • Previous research linked AP to brain morphology but not fundamental neural mechanisms.

Purpose of the Study:

  • Investigate neural mechanisms of AP using fMRI and population receptive field (pRF) modeling.
  • Compare auditory cortex responses in musicians with and without AP, and controls.

Main Methods:

  • Used fMRI and pRF modeling on 61 subjects (musicians with/without AP, controls).
  • Measured Gaussian tuning responses (center frequency, bandwidth) in auditory cortex regions (A1, R, RT).

Main Results:

  • AP musicians exhibited significantly larger cortical areas in A1, R, and RT compared to controls.
  • Increased cortical area in AP subjects was primarily associated with broader frequency tuning, particularly in low frequencies for A1 and R.
  • No significant difference in tuning distribution was observed in the RT region.

Conclusions:

  • AP is associated with expanded early auditory cortical areas dedicated to broad-frequency tuning.
  • AP musicians likely utilize enhanced ensemble representations for frequency encoding and identification.