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Progression of performance on the finger-to-thumb opposition task as indicated by the number of correctly completed sequences sampled at 30-s intervals. Three blocks each of 5 min duration were run before (Training) and after (Retrieval) 8-h retention intervals during which subjects slept (open circles), or remained awake (filled circles). Mean (± SEM; adjusted to first block of training) are shown collapsed across both daytime and nighttime condition (refer to text).
