GSTM1 and major depressive disorder: In this study, it was found that the oxy-Hb activation of left DLPFC in the depression-high resilience group was significantly higher in the positive emotional valence condition than in the negative emotional valence condition, while there was no significant difference in the oxy-Hb activation of left DLPFC in the depression-low resilience group under positive and negative emotional valence conditions.