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Histograms of all button press timings across all subjects, for the sequential and synchronous tasks on and off medication. The initial button press was at 0 s. The yellow lines indicate the median timings. The numbers of button presses shown for the four conditions are as follows: (1) synchronous on — 792 (2) synchronous off — 830 (3) sequential on — 917 (4) sequential off — 934.
