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The protocol of a trial. A trial lasted 21.6 s, with a red cross shown in the first 1.2 s as warning (the stimulus was visually shown on a black screen), then a 12-s period for the participants' solving the equation (which was showing in white characters) and keying the answer on the data glove, followed by 9.6 s for intertrial interval (ITI; showing a white star).
