Figure 6. One possible explanation for the improved performance of YNH subjects is that they learn more effectively than ONH subjects over successive testing sessions. Figure 7 shows the performance of the ONH subjects across the three test sessions. A comparison of learning effects in ONH and YNH subjects, with age and session as factors, showed that d' improved significantly over test sessions (F(2,60) = 21.07, p < 0.001) without a significant age × session interaction (F(2,60) = 1.13, NS). Thus, the learning-related improvements across sessions were similar in ONH and YNH subjects.
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