Difference in learning and retention by Albino-Swiss mice. Part IV. Effect of some nutrients

According to the preceding papers, the possible difference in activity of some nutrients on memory retrieval of "good" and "poor" learning mice was studied. Among the substances used, only phenylalanine significantly improved memory recall of poor learning mice. On the contrary, tryptophan, tyrosine, phosphatidylserine and choline did not influence memory retention of previously learned avoidance of both poor and good learning mice.