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A typical trial. The visual signal was turned on during an inspiratory phase (IN_cur). The time lengths of the preceding inspiration phase (IN_pre), expiration phase (OUT_pre) and the following expiration phase (OUT_fol) were measured for comparisons. The RT was defined as the interval between the light-on moment and the flexor digitorum superficialis (FDS) EMG onset. IN: inspiration; OUT: expiration. Note: the light-on moment may occur at any point of a respiratory phase.
