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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: Neurobiol Aging. 2017 Jan 3;54:144–151. doi: 10.1016/j.neurobiolaging.2016.12.021

Figure 1. Performance in background characterization.

Figure 1

A. Cumulative search error during training blocks of 5 trials each. This measure reflects the distance of the rat from the escape platform throughout its search, with higher numbers indicating worse performance. Aged rats (black circles) were significantly impaired relative to young (open circles) across training blocks, but not on the first trial which indicates initial, naïve performance. A repeated measures ANOVA confirmed all rats improved with training, [F(3, 63) = 45.214, p = 0.001], and showed a group difference [F(1, 21) = 8.716, p = 0.008] but no interaction. B. Learning index distribution of aged and young rats. Aged unimpaired rats, defined as having a learning index <240, scored within the range of young. Aged impaired rats have learning indexes above 240.