Abstract
These results do not substantiate previous reports that glutamic acid will increase measurable intelligence. Attitudinal effect on the part of nurses, psychologists and psychotherapists, which might influence the results, has been minimized by the use of careful controls and different psychologists in each test situation. Because of the small number of cases here reported, further studies are needed on larger groups using similar controls. A hospital with a large stable population of children with low testable intelligence would be preferable to the Langley Porter Clinic. One such study is soon to be reported. The results are in essential agreement with these.
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