Observation and Experimentation A Reply to Gow and Ingham Letter to the Editor
Letter to the Editor  |   April 01, 1994
Observation and Experimentation
 
Author Affiliations & Notes
  • Mark Onslow
    The University of Sydney, Australia
  • Janis van Doorn
    The University of Sydney, Australia
  • Denis Newman
    The University of Queensland Brisbane, Australia
Article Information
Speech, Voice & Prosodic Disorders / Fluency Disorders / Speech, Voice & Prosody / Speech / Letters to the Editor
Letter to the Editor   |   April 01, 1994
Observation and Experimentation
Journal of Speech, Language, and Hearing Research, April 1994, Vol. 37, 345-346. doi:10.1044/jshr.3702.345
History: Received October 18, 1993 , Accepted November 16, 1993
 
Journal of Speech, Language, and Hearing Research, April 1994, Vol. 37, 345-346. doi:10.1044/jshr.3702.345
History: Received October 18, 1993; Accepted November 16, 1993
Our recent paper (Onslow, van Doom, & Newman, 1992) sought to determine whether acoustic speech changes could be measured in children after they received an intensive, prolonged-speech treatment for stuttering. Unexpectedly, we did not find increases in the duration of any acoustic segments after the treatment, but found reduced variability of vowel duration (VD). The essence of Gow and Ingham’s comments about our paper is as follows:
  1. From the results of our study, Gow and Ingham state that it is “difficult to conclude that reduced VD variance had a ’salient’ role in the responsiveness of individual subjects to this particular prolonged-speech program” (p. 345).

  2. Our findings are consistent with the findings of their recent study (Gow & Ingham, 1992) that showed changes in stuttering frequency in response to changes in phonated intervals (PIs).

  3. Our methodology used “descriptive rather than experimental research methods,” and hence contributed to a lack of clarity about whether “there are critical changes in voicing or phonation that control stuttering” (p. 344).

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