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Mean Z-scores of the five channels (ch. 9, 10, 18, 23, 24) selected as COI in the same-face and the different-face conditions, respectively. The vertical line in each graph represents 1 SE. All of these channels showed the higher Z-scores in the different-face condition compared to those in the same-face condition for oxy-Hb. The main effect of condition was significant with 2 (condition) × 5 (channel) ANOVA (p < 0.01).
