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Related Experiment Videos

Sensorimotor adaptation in speech production

J F Houde1, M I Jordan

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. houde@phy.ucsf.edu

Science (New York, N.Y.)
|March 21, 1998
PubMed
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Humans adapt speech production to altered auditory feedback, adjusting vowel sounds to compensate for changes in perceived phonetic identity. This motor learning effect extends across different speech contexts and vowels.

Area of Science:

  • Speech motor control
  • Auditory feedback processing
  • Human adaptation

Background:

  • Motor adaptation is well-documented in the visual domain, where humans adjust movements in response to altered visual input (e.g., prism glasses).
  • The analogous phenomenon in the speech domain, involving adaptation to altered auditory feedback of one's own voice, is less understood.
  • Understanding speech motor adaptation is crucial for fields like speech therapy and human-computer interaction.

Purpose of the Study:

  • To investigate whether humans can adapt their speech motor behavior in response to real-time, altered auditory feedback of their own speech.
  • To determine if this adaptation specifically targets phonetic adjustments and generalizes across different speech contexts.

Main Methods:

  • Participants produced speech while receiving real-time auditory feedback that was systematically altered using a specialized device.

Related Experiment Videos

  • The feedback perturbations were designed to change the perceived phonetic identity of specific vowels.
  • Speech production and perception were monitored to quantify adaptation and generalization.

    • Main Results:

    • Subjects demonstrated significant adaptation in their vowel production to compensate for the altered auditory feedback.
    • The adaptation effectively normalized the perceived phonetic identity of the target vowel.
    • The learned adjustments generalized to untrained phonetic contexts and different vowel sounds, indicating robust motor learning.

    Conclusions:

    • Human speech motor control exhibits adaptive capabilities analogous to motor adaptation in the visual domain.
    • Speakers can learn to adjust their vocal tract output to counteract perceived changes in phonetic identity caused by altered auditory feedback.
    • This study highlights the plasticity of speech production and its reliance on auditory feedback for real-time regulation.