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Illustration of the experimental task. In each trial (1250 ms), participants identified a centrally-presented visual letter (“X” or “O”; duration, 350 ms) while ignoring an auditory letter spoken in headphones (“X” or “O”; duration, 350 ms). The auditory letter was either congruent or incongruent with the visual letter. Variable periods of visual fixation were added between trials (ranging from 5000 ms to 8750 ms, in units of 1250 ms).
