3.1 N200 (a negativity peaking at 316 ms corresponded to
N200 at FCz, see Figure 3a)
We conducted a two-way 2 (within-subject: probe vs. irrelevant)
by 2 (between-subject: guilty vs. innocent) mixed ANOVA on N200
amplitude. The results showed a significant main effect of stimulus
type, F (1, 58) = 10.54, p = 0.002,ηp2 = 0.15,
BFInclusion = 686.91, with more negative N200 elicited
by the probe than by the irrelevant (-2.92 ± 0.58 μV vs. -1.45 ± 0.40
μV). There was no significant main effect of group: F (1, 58) =
3.26, p = 0.08, BFExclusion = 0.01. As expected,
there was a significant stimulus type × group interaction: F (1,
58) = 18.70, p < 0.001,ηp2 = 0.24,
BFInclusion = 575.74. Follow-up tests showed that among
guilty participants, the probe elicited more negative N200 than the
irrelevant (-4.70 ± 0.82 μV vs. -1.28 ± 0.57 μV, F (1, 58) =
28.66, p < 0.001,ηp2 = 0.33,
BF10 = 217.48). In contrast, no differences in N200
amplitude were found between the probe and irrelevant for innocent
participants (-1.14 ± 0.82 μV vs. -1.63 ± 0.57 μV, F (1, 58) =
0.58, p = 0.45, BF01 = 3.16). For grand-averaged
ERPs and their scalp distributions that are time-locked to CIT stimuli,
see Figures 2 and 4 .