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Journal of Speech, Language, and Hearing Research Vol.43 1038-1053 August 2000.
© American Speech-Language-Hearing Association
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A Positron Emission Tomography Study of Silent and Oral Single Word Reading in Stuttering and Nonstuttering Adults

Luc F. De Nil 1
Robert M. Kroll 2
Shitij Kapur 3

Sylvain Houle 4
1 Department of Speech-Language Pathology University of Toronto and Human Communication Laboratory The Toronto Western Hospital Toronto, Ontario, Canada
2 Stuttering Centre Speech Foundation of Ontario and Department of Speech-Language Pathology University of Toronto Ontario, Canada
3 Positron Emission Tomography Centre Department of Psychiatry University of Toronto and Rotman Research Institute Baycrest Centre for Geriatric Care Toronto, Ontario, Canada
4 Positron Emission Tomography Centre Centre for Addiction and Mental Health and Departments of Psychiatry and Medical Imaging University of Toronto Ontario, Canada

luc.denil{at}utoronto.ca

Over the last decade positron emission tomography (PET) has been used extensively for the study of language and other cognitive and sensorimotor processes in healthy and diseased individuals. In the present study, [15O]H2O PET scanning was used to investigate the lateralization and functional distribution of cortical and subcortical activity involved in single word reading in stuttering and non-stuttering individuals. Ten right-handed male stuttering adults and matched nonstuttering individuals were instructed to read individually presented single words either silently or out loud. Subtraction of functional brain images obtained during each of the two reading tasks, and during a non-linguistic baseline task, was used to calculate within-group and between-group differences in regional cerebral blood flow by means of statistical parametric mapping. Increased activation in the left anterior cingulate cortex (ACC) was observed during silent reading in the stuttering speakers but not in the nonstuttering group. Because of the hypothesized role of the ACC in selective attention and covert articulatory practice, it is suggested that the observed increased ACC activation in the stuttering individuals reflects the presence of cognitive anticipatory reactions related to stuttering. During the oral reading task, within-group comparisons showed bilateral cortical and subcortical activation in both the stuttering and the nonstuttering speakers. Between-group comparisons showed a proportionally greater left hemisphere activation in the nonstuttering speakers, and a proportionally greater right hemisphere activation in the stuttering individuals. The results of the present study provide qualified support for the hypothesis that stuttering adults show atypical lateralization of language processes.

KEY WORDS: stuttering, positron emission tomography, word reading, neuroimaging, adults

Submitted on January 5, 1999
Accepted on February 10, 2000


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