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Related Experiment Videos

Central auditory plasticity: changes in the N1-P2 complex after speech-sound training.

K Tremblay1, N Kraus, T McGee

  • 1Department of Speech and Hearing Sciences, University of Washington, Seattle 98105, USA.

Ear and Hearing
|April 28, 2001
PubMed
Summary

Training improved voice-onset-time (VOT) perception, evidenced by increased N1-P2 amplitude in auditory evoked potentials. This suggests the N1-P2 complex can objectively track speech-sound representation improvements.

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Area of Science:

  • Auditory Neuroscience
  • Speech Perception Research
  • Neurophysiology

Background:

  • Voice-onset-time (VOT) is crucial for distinguishing speech sounds.
  • Auditory cortical evoked potentials, specifically the N1-P2 complex, are used to study neural responses to auditory stimuli.
  • Understanding neural correlates of speech perception training is important for audiology and neuroscience.

Purpose of the Study:

  • To investigate if the N1-P2 complex reflects neural changes from training that enhance voice-onset-time (VOT) perception.
  • To assess the relationship between behavioral improvements in VOT discrimination and neurophysiological measures.
  • To explore the potential clinical utility of the N1-P2 complex in evaluating speech-sound training outcomes.

Main Methods:

  • Ten normal-hearing young adults underwent behavioral and neurophysiological testing before and after training.

Related Experiment Videos

  • Training focused on discriminating between synthetic /ba/ syllables with -20 msec and -10 msec VOT.
  • Auditory cortical evoked potentials (N1-P2) were recorded using two stimulus presentation rates (390 ms and 910 ms ISI).

    • Main Results:

    • Participants successfully learned to differentiate the -20 msec VOT (/ba/ as "mba") from the -10 msec VOT (/ba/ as "ba").
    • A significant increase in N1-P2 peak-to-peak amplitude was observed as VOT perception improved.
    • The training effects on the N1-P2 complex were more pronounced at the slower stimulus presentation rate.

    Conclusions:

    • Improved speech perception, specifically VOT discrimination, correlates with an increased N1-P2 amplitude.
    • The observed changes in N1-P2 morphology suggest enhanced neural synchrony and strengthened neural connections.
    • The N1-P2 complex shows promise as an objective physiological marker for assessing speech-sound representation and training efficacy.