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Subtracted EMG signals in deceleration perturbation trials. Mean and standard deviation among all the participants are illustrated. The amplitude of the long-latency component of the TA response was reduced in trials under which the participants knew the timing of the perturbation. Error bars show standard deviations. The mean amplitude was compared by using paired t-tests for four time window: 40~60 ms, 60~80 ms, 80~100 ms and 100~150 ms.
