“…As mentioned in the “Introduction,” three ERP components were analyzed in the current experience, namely P2, N2, and P3. Based on visual observation and the guideline proposed by Picton et al (2000) , the following representative channels and time windows were selected: (1) for P2, nine electrodes in the frontal-central area (F3, Fz, F4, FC3, FCz, FC4, C3, Cz, and C4; Jin et al, 2017b ) were selected in the time window from 230 to 280 ms; (2) for N2, nine electrodes in the frontal–central area (F3, Fz, F4, FC3, FCz, FC4, C3, Cz, and C4; Jin et al, 2017a ) were selected in the time window from 280 to 330 ms; (3) for P3, nine electrodes in the whole brain area (C3, Cz, C4, CP3, CPz, CP4, P3, Pz, and P4; Cai et al, 2021 ) were selected in the time window from 330 to 380 ms. The mean amplitudes of P2, N2, and P3 in each condition were extracted separately according to the time window, and two-way repeated ANOVA analyses were conducted for each condition with the two within-subject factors (large/small number of donated peers and electrodes).…”