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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Differential sensitivity to changes in pitch acceleration in the auditory brainstem and cortex.

Ananthanarayan Krishnan1, Chandan H Suresh1, Jackson T Gandour1

  • 1Department of Speech Language Hearing Sciences, Purdue University, USA.

Brain and Language
|February 27, 2017
PubMed
Summary

Mandarin speakers

Keywords:
Cortical pitch responseExperience-dependent plasticityFunctional asymmetryFundamental frequency responseIterated rippled noiseLexical toneMandarin ChinesePitchPitch accelerationPitch encoding

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Linguistic Phonetics

Background:

  • The human auditory system processes complex pitch contours, crucial for tonal languages like Mandarin.
  • Cortical pitch-specific responses (CPR) and brainstem frequency following responses (FFR) are electrophysiological measures reflecting pitch perception.
  • Language experience shapes auditory processing, particularly for pitch variations.

Purpose of the Study:

  • To investigate how native Mandarin listeners' brains process time-variant pitch contours (Mandarin Tone 2) compared to linear pitch contours.
  • To examine differential neural weighting of pitch temporal attributes at subcortical and cortical levels.

Main Methods:

  • Concurrent recording of cortical pitch-specific responses (CPR) and brainstem frequency following responses (FFR) from native Mandarin listeners.
  • Utilizing time-variant Mandarin Tone 2 (T2) and constant, linear rising ramp (Linear) pitch stimuli.
  • Analyzing Na-Pb and Pb-Nb components of CPR, and FFR magnitudes.

Main Results:

  • Both T2 and Linear stimuli elicited responses at cortical and brainstem levels.
  • T2 consistently elicited larger responses than Linear across both CPR (Na-Pb, Pb-Nb) and FFR.
  • The Pb-Nb component of CPR showed a significantly larger magnitude difference between T2 and Linear than Na-Pb or FFR.

Conclusions:

  • The brain differentially weights specific temporal attributes of pitch, with Mandarin Tone 2 eliciting stronger responses.
  • Subcortical and cortical auditory processing levels exhibit distinct weighting mechanisms for pitch temporal features.
  • Findings support a hierarchical and integrated neural network for pitch processing, influenced by language experience.