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Typical stimuli for Experiments 1–3. Each black square is a fixation mark. The letter triplet is peripheral (center is 8° to 10° in the lower visual field) in Experiments 1 and 2 and central (0°) in Experiment 3. In Experiment 1, the two flankers are different: similar and dissimilar to the target. In Experiments 2 and 3, they are the same: Both are similar or dissimilar to the target
