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Minimal reaction times for phonatory initiation

K Izdebski, T Shipp

    Journal of Speech and Hearing Research
    |December 1, 1978
    PubMed
    Summary
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    This study explored reaction time (RT) for vocal and digital responses. Digital responses were faster than vocal responses, with vocal RTs influenced by lung volume and vocal-fold position.

    Area of Science:

    • Neuroscience
    • Human Motor Control
    • Speech Physiology

    Background:

    • Voluntary response initiation speed is crucial for human interaction.
    • Understanding the factors influencing vocal reaction time (RT) is important for fields like speech pathology and neuroscience.
    • Previous research has explored digital RT, but vocal RT has received less attention.

    Purpose of the Study:

    • To determine the minimum voluntary reaction time for initiating vocal and digital responses.
    • To investigate the effects of stimulus type (auditory, somesthetic), vocal-fold position (abducted, adducted), and lung volume (75%, 50%, 25% VC) on vocal RT.
    • To compare vocal RT with digital RT.

    Main Methods:

    • Simple reaction time (RT) methodology was employed with 30 neurologically normal adults (15 male, 15 female).

    Related Experiment Videos

  • Subjects were pre-trained to respond to stimulus onset after a computer-controlled preparatory interval.
  • Vocal RT was measured under varying stimulus types, prephonatory vocal-fold positions, and lung volumes.

    • Main Results:

    • The average minimal vocal RT was 195 msec, with the fastest recorded at 120 msec.
    • Digital RTs were significantly shorter than vocal RTs for both sexes.
    • Vocal RTs were shorter at mid-lung volume and for females with abducted vocal-folds; differences based on stimulus type and sex were not statistically significant.

    Conclusions:

    • Digital responses are initiated faster than vocal responses.
    • Vocal response initiation speed is influenced by physiological factors such as lung volume and vocal-fold positioning.
    • These findings contribute to understanding the neural and physiological underpinnings of voluntary motor response initiation.