Effect of glutamic acid on the learning ability of bright and dull rats: I. Administration during infancy.

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Abstract
To resolve conflicting past results on the effect of glutamic acid upon the maze-learning of rats, the hypothesis that it facilitates the learning of dull animals but has no effect on bright ones was tested. First, using two groups of the McGill dull strain (F10), and feeding a supplement of 200 mg. of monosodium glutamate daily from 25 to 65 days of age to the experimental group, there were significant differences from the controls in both errors and time on the Hebb-Williams maze. The experiment repeated, using both dull and bright rats, indicated that glutamic acid can increase the learning of dull rats considerably, but has no such effect on bright ones.

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