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Schematization of single trials in the two experiments. Upper, RANDOM condition of experiment 1: the duration of the set-period was unpredictable and varied between 200 and 1400 ms. Middle, FIXED condition of experiment 1: the set-period duration is 800 ms in every trial. Lower, TMS was delivered at a random time (square-wave function) comprised between 400 and 800 ms form the beginning of the set-period.
