Fig. 4.

Accuracy for match and non-match trials as a function of stimulus set size. a Accuracy for match trials was relatively stable across stimulus set sizes, except that fewer correct match responses were made during sessions using the smallest sets (two and four). b PI associated with the smaller stimulus sets had a much larger impact on non-match accuracy, rising steadily from 67% in the two-stimulus set condition to 89% in the trial-unique condition. TU = trial unique. Error bars indicate the standard error of the mean.