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(a) In the SDRT task, a sequence of screens are presented. A fixation cross for 500ms, the cue dots for 2000ms, another fixation cross for 3000ms, and the probe dot for 3000ms. Within the 3000ms probe phase, the subject responds. (b) In the CPT task, the subject is presented with either an ‘X’ or ‘not X’ for 250ms, after which there is a blank screen for either 1000, 2000 or 4000ms before the next trial.
