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Average trial time for pretest (3–4 days prior to start of acquisition) and posttest (9 days following end of acquisition) are shown for the (A) nine hole peg test (9HPT) and (B) functional dexterity task. Gray = “off” levodopa group; Black = “on” levodopa” group. Note that both groups performed the 9HPT and functional dexterity task “on” levodopa, regardless of group allocation. Error bars indicate standard error. Lower times indicate better performance.
