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(A) Examples of the stimulus pair 1 vs. 5 with variations of surface, size, shape, and pattern of elements. Similar conditions were also used for 1 vs. 4, 1 vs. 3, and 1 vs. 2; (B) examples of control stimuli for 1 vs. 5. Similar conditions were presented for 1 vs. 4, 1 vs. 3, and 1 vs. 2.
