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Repeated Vowel Production Affects Features of Neural Activity in Sensorimotor Cortex.

E Salari1, Z V Freudenburg1, M J Vansteensel1

  • 1Brain Center Rudolf Magnus, Department of Neurology and Neurosurgery, University Medical Center Utrecht, Utrecht, The Netherlands.

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Summary

Brain activity in the sensorimotor cortex changes with repeated speech. Past utterances influence current neural signals, impacting speech decoding for brain-computer interfaces.

Keywords:
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Area of Science:

  • Neuroscience
  • Speech motor control
  • Brain-computer interfaces

Background:

  • The sensorimotor cortex generates movements, and its use for speech decoding via brain-computer interfaces (BCIs) is of growing interest.
  • Speech decoding is complex due to incomplete understanding of the neural activity-motor action relationship, including non-linearities and effects of prior movements.

Purpose of the Study:

  • To investigate if preceding motor actions during speech production affect sensorimotor cortex neural activity.
  • To determine the influence of utterance timing on neural responses during speech.

Main Methods:

  • Electrocorticography (ECoG) was used to measure high-frequency band (HFB) power changes (75-135 Hz) in the sensorimotor cortex.
  • Three subjects produced the vowel /i/ at varying repetition rates (1, 1.33, 1.66 Hz) while HFB power was recorded for each utterance.

Main Results:

  • HFB power peaks decreased with successive vowel utterances, irrespective of performance.
  • Longer intervals between utterances led to more electrodes showing consistent responses across repetitions.
  • This suggests that the duration between speech productions influences subsequent sensorimotor cortex activity.

Conclusions:

  • Sensorimotor cortex activity during speech is affected by previous utterances and the timing between them.
  • These findings are consistent with prior research on finger movements.
  • Accurate BCIs for speech decoding must account for the history of utterances to interpret neural signals effectively.