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False start paradigm showing events of a single trial. A visual warning signal is given, followed by a fore period of 1.5, 2.0, or 2.5 s, and then an imperative auditory stimulus is provided. On one quarter of the trials, a mechanical perturbation is given prior to the auditory stimulus at one of five times (250, 200, 150, 100, or 50 ms before the auditory stimulus).
