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Example of an RSVP trial. On every trial, 20 items were presented at the center of the screen, preceded by a 2,000-ms fixation cross. Most of the items were letters, presented for 70 ms each and followed by a 30-ms blank. Participants had to detect two target numbers (T1 and T2) among the items. T1 and T2 were separated by one, three, five, or eight non-target items, defining the lag. T1 was presented at position 7, 8, and 9 of the stimulus stream.
