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The American Journal of Psychiatry, VOL. 104, No. 10

Article | April 01, 1948

THE CEILING EFFECT OF GLUTAMIC ACID UPON INTELLIGENCE IN CHILDREN AND IN ADOLESCENTS

FREDERIC T. ZIMMERMAN; BESSIE B. BURGEMEISTER; TRACY J. PUTNAM

Am J Psychiatry 1948;104:593-599.

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The Department of Neurology, Columbia University, College of Physicians and Surgeons, the Service of Child Neurology, Vanderbilt Clinic and Neurological Institute, and the Department of Psychology, Neurological Institute.

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Abstract

1. Glutamic acid accelerates mental functioning in human subjects.2. The acceleration is general and is not restricted to segments of the intelligence and personality of the individual.3. The greatest improvement in intelligence and performance test scores occurs within the initial 6 months of treatment, after which the acceleration is diminished and appears to be approaching a ceiling after one year of therapy.

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