Difference scores for trials in which the two arrays had different numbers of items. These scores reflect the difference in performance on trials in which the smaller array was at left minus performance on trials in which the smaller array was at right. Four comparisons are presented. From left to right, those are all comparisons, all adjacent pairs, only comparisons of small numbers (2v3, 2v4, 3v4), only comparisons of large numbers (6v7, 6v8, 7v8), and comparisons that bridge between small (2, 3, or 4) and large (6, 7, or 8) set sizes. Error bars indicate 95% CIs.