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Attentional demands modulate sensorimotor learning induced by persistent exposure to changes in auditory feedback.

Nichole E Scheerer1, Anupreet K Tumber1, Jeffery A Jones2

  • 1Psychology Department and Laurier Centre for Cognitive Neuroscience, Wilfrid Laurier University, Waterloo, Ontario, Canada.

Journal of Neurophysiology
|December 15, 2015
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Summary

Attention is crucial for speech motor control. Dividing attention impairs the use of auditory feedback for vocal regulation and learning new vocal patterns.

Keywords:
attentionauditory feedbacksensorimotor learningspeech motor control

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Area of Science:

  • Speech production and perception
  • Auditory feedback mechanisms
  • Cognitive neuroscience of speech

Background:

  • Auditory feedback is essential for regulating vocalizations and adapting to vocal tract changes.
  • The role of attention in modulating the processing of auditory feedback for speech motor control remains unclear.

Purpose of the Study:

  • To investigate whether attention influences the relationship between motor commands and acoustic output during speech.
  • To determine if divided attention affects the utilization of auditory feedback for vocal regulation and sensorimotor learning.

Main Methods:

  • Participants vocalized under single-task (passive viewing) and dual-task (monitoring visual targets) conditions.
  • Vocal pitch was measured during sustained vocalizations with persistent downward pitch-shifted auditory feedback.
  • Vocal pitch at the onset of vocalizations was analyzed to assess sensorimotor adaptation.

Main Results:

  • Compensatory vocal pitch adjustments to auditory feedback were smaller in the dual-task condition, indicating interference with real-time vocal regulation.
  • Changes in vocal pitch at vocalization onset were reduced in the dual-task condition, suggesting diminished sensorimotor learning.
  • Divided attention impaired the integration of auditory feedback for both immediate vocal adjustments and motor command planning.

Conclusions:

  • Attention is necessary for the speech motor system to effectively utilize auditory feedback.
  • Divided attention disrupts the adaptive mechanisms underlying speech production, impacting both regulation and learning.
  • These findings highlight the cognitive demands involved in maintaining accurate speech production under altered auditory conditions.