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A Method to Study Adaptation to Left-Right Reversed Audition
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Published on: October 29, 2018

Adaptation to spectrally-rotated speech.

Tim Green1, Stuart Rosen, Andrew Faulkner

  • 1Speech, Hearing, and Phonetic Sciences, UCL, Chandler House, 2, Wakefield Street, London, WC1N 1PF, United Kingdom.

The Journal of the Acoustical Society of America
|August 10, 2013
PubMed
Summary

Listeners can adapt to spectrally-rotated speech after training, improving sentence recognition. This adaptation involves adjusting to altered spectral shape and dynamics, not just unaffected speech features.

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Area of Science:

  • Auditory perception
  • Speech processing
  • Acoustic phonetics

Background:

  • Speech perception relies on processing complex spectral information.
  • Spectral rotation drastically alters speech acoustics, initially causing unintelligibility.
  • Listeners' ability to adapt to distorted speech is a key area of research.

Purpose of the Study:

  • To investigate whether normal-hearing adults can adapt to spectrally-rotated speech.
  • To determine the extent of speech perception improvement after training.
  • To identify the specific acoustic features contributing to successful adaptation.

Main Methods:

  • Four normal-hearing adults received 6 hours of training with spectrally-rotated speech using Continuous Discourse Tracking.
  • Pre- and post-training speech perception tests were administered to trained and untrained control groups.
  • Speech materials were manipulated to isolate the contribution of various speech features.

Main Results:

  • Trained participants showed significantly improved recognition of spectrally-rotated sentences compared to controls.
  • No significant improvement was observed in identifying medial vowels or intervocalic consonants.
  • Adaptation appeared to involve adjusting to altered spectral shape and dynamics.

Conclusions:

  • Short-term training can enhance the intelligibility of spectrally-rotated speech.
  • Adaptation to spectral rotation relies on processing altered spectral information, not solely on unaffected features like intonation.
  • Further research is needed to understand the neural mechanisms of auditory adaptation to distorted speech.