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Effects of age on learning of olfactory discrimination problems involving unrelated odorants. Graphs show the percentage of correct trials (in 20-trial blocks) on 3 discrimination problems involving dissimilar odorants. Rats were tested on each discrimination problem once. Aged rats were impaired relative to young on only 1 of the 3 discrimination problems (citral vs. 2-heptanone). Abbreviation: SEM, standard error of the mean.
