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Trials begin when two sample stimuli appear in the center of the display screen.
The participant observes them and then touches the sample display area. The samples disappear, and three comparison stimuli appear in the corners of the screen. One of the comparisons matches one of the samples, and selecting it is the correct response. Because the participant cannot predict which one of the samples will appear as the correct comparison, he or she must observe both of the samples to be correct on every trial. The participant ends the observation period by touching the sample display area.