Fig. 4: Results of perceptual scaling in the target-present condition.

Structure of recognition memory is revealed by voting scores obtained from the paired comparison (PAR) target-present lineup: for all subjects in (a) (N = 62 subjects, who also appear in Fig. 3a), for subjects who exhibited top-rank voting scores for the target face (F1) in (b) (N = 20 subjects), and for subjects who exhibited top-rank voting scores for non-target faces in (c) (N = 37 subjects). (The five subjects, for whom there were voting score ties for top rank, are included in (a), but not in (b) or (c).) Circles represent medians. Vertical bars represent interquartile ranges. Significant differences between the faces in adjacent ranks are indicated by single (p < 0.05) or double (p < 0.01) asterisks. A nonparametric statistical test was used to evaluate differences, as described in Methods (section Perceptual scaling of lineup faces). This is a one-sided statistical test.