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Boston Veterans Administration Medical Center and Boston University School of Medicine (Dr. Helm-Estabrooks), Boston, MA; the Department of Psychology, University of New Mexico (Dr. Yeo), Albuquerque, NM; Harvard University and Beth Israel Hospital (Dr. Geschwind), Boston, MA; Mt. Sinai Hospital, Baycrest Hospital and University of Toronto (Dr. Freedman), Toronto, Canada; and the Department of Psychology, Boston College (Ms. Weinstein), Boston, MA.
Despite 60 years of study, the brain mechanisms for stuttering are unknown. In an effort to shed light on these mechanisms, we studied two cases in which the fluency of speech changed after brain damage in adulthood. The first, an ambidextrous man, ceased to stutter after a head injury. The second, a converted left-handed man, experienced recurrence of childhood stuttering after a stroke.
Address correspondence and reprint requests to Dr. Helm-Estabrooks, Neurology Service, Veterans Administration Medical Center, 150 South Huntington Avenue, Boston, MA 02130.
Dr. Freedman was supported by funds from the Ontario Ministry of Health, Canada.
Accepted for publication December 18, 1985.
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