The BIS and TRB variables were compared across genders using t-tests. The correlations between ERP variables and Behavioral measures were analyzed in a 3-step procedure: 1) Factor analysis, using principal component analysis and varimax rotation, was performed to reduce the ERP variables (N = 144) as well as the TRB variables (N = 24) into a few specific factors; 2) Pearson (bivariate) correlations were performed to analyze the relationship between behavioral factors and ERP factors; and 3) Bonferroni corrections were applied for multiple testing across factors. ERP variables for the factor analysis comprised of nine electrode sites (F3, FZ, F4, C3, CZ, C4, P3, PZ, P4), four conditions (+50, +10, −50, −10), two components (ORN, ORP), and two measures (amplitude, latency). The optimal number of factors was determined based on the shape of the scree plots (i.e. components lie on the steep slope). However, factor analysis was not done on BIS scores as they were only a few and already factorized as the subcategories were factorized in the original work [36, 37].
