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The experimental design. A, During the imagery task, participants were cued (via either a high or low pitch auditory tone) on a trial-by-trial basis to imagine either X or O. The intertrial interval (ITI) was randomized between 3 and 12 s. B, During the perceptual task, participants were instructed to watch a series of visually presented letter stimuli (X or O; duration 250 ms, ITI 3–12 s) and press the same button following the presentation of each stimulus.
