Relationship between supranormal glutamic acid and maze learning.

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Abstract
The writer reports further experiments on the effect of glutamic acid on learning in rats. "Weanling white rats, maintained for four weeks on diets with ten and twenty per cent supplements of l(+)-glutamic acid, consistently failed to exceed their controls in the learning of a modified Stone multiple-T water maze." It is pointed out that no experiments with glutamic acid have corroborated the results originally reported by Zimmerman and Ross and by Albert and Warden, and Marx concludes "that the weight of experimental evidence at the present time supports the view that supranormal glutamic acid plays no special role in psychological functions, but that under some experimental conditions it may be metabolized for energy so as to provide, indirectly, a facilitation of performance." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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