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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. 1.

Fig. 1

Effects of age on olfactory discrimination learning involving odorants varying in perceptual similarity using a longitudinal design. Graphs show the percentage of correct trials (in 20-trial blocks) on 3 odor discrimination problems in which the odors (selected from a series of aliphatic alcohols) 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 the same discrimination problems at 3 different time points. Performance was worse on problems with more perceptually similar stimuli but improved across time points with repeated testing. Abbreviation: SEM, standard error of the mean.