Minimal Reaction Times for Phonatory Initiation The maximum speed at which voluntary vocal and digital responses can be initiated was investigated in 15 male and 15 female neurologically normal adults using simple reaction time (RT) methodology. All subjects were pretrained to respond as quickly as possible to stimulus onset following a computer-controlled preparatory interval. Voluntary minimal ... Research Article
Research Article  |   December 01, 1978
Minimal Reaction Times for Phonatory Initiation
 
Author Affiliations & Notes
  • Krzysztof Izdebski
    University of California, San Francisco
  • Thomas Shipp
    Veteran’s Administration Hospital, San Francisco
Article Information
Research Articles
Research Article   |   December 01, 1978
Minimal Reaction Times for Phonatory Initiation
Journal of Speech, Language, and Hearing Research, December 1978, Vol. 21, 638-651. doi:10.1044/jshr.2104.638
History: Received January 10, 1978 , Accepted April 25, 1978
 
Journal of Speech, Language, and Hearing Research, December 1978, Vol. 21, 638-651. doi:10.1044/jshr.2104.638
History: Received January 10, 1978; Accepted April 25, 1978

The maximum speed at which voluntary vocal and digital responses can be initiated was investigated in 15 male and 15 female neurologically normal adults using simple reaction time (RT) methodology. All subjects were pretrained to respond as quickly as possible to stimulus onset following a computer-controlled preparatory interval. Voluntary minimal RTs for phonation initiation were studied as a function of (1) stimulus type (auditory and somesthetic), (2) prephonatory vocal-fold position (abducted and adducted), and (3) subject’s lung volume (75%, 50%, and 25% VC). The average minimal vocal RT across subjects was 195 msec, and the fastest recorded vocal RT was 120 msec. Although vocal responses to an auditory stimulus were somewhat shorter than to a somesthetic stimulus, neither these differences nor the RTs between sexes were statistically significant except that females had shorter vocal RTs from an abducted prephonatory vocal-fold position. Shorter vocal RTs were obtained when phonation was initiated at midlung volume than at the lung volume extremes, and for both sexes the average digital RTs were significantly shorter than vocal RTs.

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