Abstract
In a double-blind study, 106 mentally retarded patients with speech defects were given 15 mg. of d-Amphetamine daily, or a placebo, for a three-month period. Speech defect types were: Stuttering, immature production, oral inaccuracy, lisp, psychotic, mongoloid, aphasia, deafness, and cleft palate. Only the stutterers showed obvious improvement in comparison with the placebo group. Three severe, long-term stutterers showed such dramatic improvement that their whole course in life has been changed.
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Selected References
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