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Subcortical frequency-coding errors are linked to speaker-variability intolerance in normal-hearing adults.

Fuh-Cherng Jeng1, Chao-Yang Lee1, Tiffany N McDonald1

  • 1Communication Sciences and Disorders, Ohio University, Grover Center W224, Athens, Ohio 45701, USA jeng@ohio.edu, leec1@ohio.edu, tm553911@ohio.edu, hg585510@ohio.edu, et474813@ohio.edu, bh130015@ohio.edu.

The Journal of the Acoustical Society of America
|October 2, 2017
PubMed
Summary

Listeners with subcortical frequency-coding errors struggle with processing speech from multiple speakers. This impacts understanding speaker-specific information, crucial for effective communication.

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Area of Science:

  • Auditory Neuroscience
  • Speech Processing
  • Psychoacoustics

Background:

  • Speaker-specific information is vital for effective communication.
  • Understanding how the brain processes vocal variations is key to auditory perception.

Purpose of the Study:

  • To investigate the subcortical encoding of fundamental frequency (F0) cues.
  • To examine the relationship between F0 encoding and the ability to process multi-speaker speech.

Main Methods:

  • Utilized scalp-recorded frequency-following responses (FFRs) to assess subcortical processing.
  • Employed Mandarin tones with distinct F0 contours to probe frequency coding.
  • Correlated FFR-based frequency-coding errors with behavioral measures of speaker-variability intolerance.

Main Results:

  • Subcortical frequency-coding errors significantly correlated with speaker-variability intolerance.
  • This correlation was observed in both accuracy (percent correct) and speed (reaction time) measures.
  • Demonstrated a link between neural encoding of pitch and the perception of speaker differences.

Conclusions:

  • Subcortical auditory processing plays a critical role in distinguishing speakers.
  • Frequency-coding efficiency influences the ability to handle speech variability.
  • Findings inform understanding of auditory processing in both typical and impaired hearing populations.