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An Integrated Approach to Concurrently Measure Corrective and Adaptive Responses to Auditory Errors.

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This study introduces a new method to simultaneously assess feedforward and feedback speech control systems. The findings show the brain adjusts responses based on auditory error magnitude and direction, suggesting similar error sensitivity across different speech sounds.

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Area of Science:

  • Neuroscience
  • Speech Science
  • Auditory Perception

Background:

  • Speech production involves complex feedforward and feedback control systems.
  • Auditory errors are crucial for refining speech accuracy.
  • Current methods for studying these systems in isolation are time-consuming and impractical.

Purpose of the Study:

  • To develop and validate a novel paradigm for concurrently examining feedforward and feedback speech control systems.
  • To assess the brain's adaptive and corrective responses to auditory perturbations.

Main Methods:

  • Applied varying auditory perturbation magnitudes (0-500 Hz) and directions (ε-to-ɪ, ε-to-ӕ) in a randomized, rapid-switching paradigm.
  • Measured formant changes at early (0-100 ms) and late (200-300 ms) production time points.
  • Calculated adaptive responses (feedforward) and corrective responses (feedback) based on measured formant changes.

Main Results:

  • Participants exhibited adaptive and corrective responses opposing the perturbation direction.
  • Responses were proportionally larger for smaller perturbations, particularly in the ε-to-ɪ direction.
  • Individual sensitivity to ε-to-ɪ perturbations correlated with sensitivity to ε-to-ӕ perturbations.

Conclusions:

  • The brain demonstrates sensitivity to auditory error magnitude and direction for both feedforward and feedback control.
  • The proposed paradigm offers an efficient method for concurrently measuring feedforward and feedback contributions to speech control.
  • Findings suggest comparable error sensitivity in the ε-to-ɪ and ε-to-ӕ speech sound contexts.