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A/B. Subjects in the evening group showed a significantly greater improvement in finger-tapping speed across the first (A) and second (B) retention interval compared to the afternoon group. C/D. Subjects in the evening group showed a greater gain in accuracy (as indexed by a decrease in the error rate) across the first (C) and second retention interval (D). Error bars depict SE, the asterisks (*) indicate statistical significance, P<0.05.
