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Journal of Speech and Hearing Research Vol.35 555-561 June 1992.
© American Speech-Language-Hearing Association
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Brain Blood Flow Related to Acoustic Laryngeal Reaction Time in Adult Developmental Stutterers

Ben C. Watson 1
Kenneth D. Pool 2
Michael D. Devous Sr. 3
Frances J. Freeman 1

Terese Finitzo 2
1 University of Texas at Dallas Callier Center for Communication Disorders
2 Methodist Medical Center Neuroscience Center, Dallas
3 University of Texas Southwestern Medical Center, Dallas

The 1980s witnessed renewed interest in the relation between developmental stuttering and central nervous system (CNS) abnormalities. We have reported differences between nonstutterers and developmental stutterers on electrophysiologic (QTE) and metabolic (rCBF) measures of brain function. A critical step in the interpretation of results of functional brain imaging studies is to determine the relation, if any, of identified CNS abnormalities to speech motor control in persons who stutter. In this study we addressed the interpretation of rCBF findings by asking whether we could identify patterns of impaired acoustic laryngeal reaction time (LRT) as a function of response complexity parallel to rCBF findings. Stutterer subgroups determined by clinical seventy ratings were not differentiated by LRT values as a function of response complexity. Stutterers with relative blood flow asymmetry below the normal median value involving both left superior and middle temporal regions of interest (ROIs) showed significantly longer LRT for the complex response than did normal speakers and stutterers with above-normal median relative flow values to at least one of these temporal ROIs. Stutterer subgroups based on reduced cingulate flow alone were not differentiated by LRT values. Findings are consistent with Goldberg's (1985) model of CNS premotor processing. Findings also suggest that stutterer subgroups might be distinguished by the presence, loci, and relative magnitude of cortical and/or subcortical rCBF abnormality in regions that subserve a fluency-generating system.

KEY WORDS: developmental stuttering, LRT, rCBF, fluency

Submitted on April 16, 1991
Accepted on October 10, 1991


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Copyright © 1992 by the American Speech-Language-Hearing Association.