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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Neurobiol Aging. 2017 Feb 7;53:122–137. doi: 10.1016/j.neurobiolaging.2017.01.023

Fig. 2.

Fig. 2

Effects of age on learning of olfactory discrimination problems involving odorants from multiple chemical classes varying in perceptual similarity. Graphs show the percentage of correct trials (in 20-trial blocks) on discrimination problems across 3 classes of odorants, in which the odors varied in the difference between the numbers of carbon atoms and hence their perceptual similarity. Δ5, Δ3, and Δ1 refer to differences of 5, 3, and 1 carbon atoms between the 2 odorants in each problem. Rats were tested on each discrimination problem once. Performance was worse on problems with more perceptually similar stimuli, and aged rats were disproportionally impaired relative to young on these more difficult problems. Abbreviation: SEM, standard error of the mean.