Although antipsychotic dosage levels exhibited significant negative correlations with oxy-Hb changes in two channels (ch10: rho = −0.421, p = 0.020; ch13: rho = 0.404, p = 0.012), those channels (ch23, ch24, ch34, ch42, ch50, and ch52) in which we observed significant correlation between oxy-Hb changes and depression/anxiety component scores were not among these two channels. This evidence concerns the gene GSTM1 and major depressive disorder.