The BD group exhibited significantly smaller task-related oxy-Hb changes in 9 channels in comparison to HCs (ch5, ch34–35, ch43–46, ch49 and ch51; P = 0.000–0.010) and in 3 channels in comparison to the SZ group (ch43–45; P = 0.004–0.021). This evidence concerns the gene GSTM1 and Behcet disease.