GSTM1 and hydrops fetalis: It is noted that both HbO2 and Hb results indicate a significant change in the corner of the right hemisphere (ROI 1 and ROI 4), however, only the hemodynamic signal within ROI 1 was significantly correlated with d’ (R = 0.54, p < 0.01) indicating that participants’ accuracy for HF trials was related to degree of HbO2 changes in the lateral inferior region of the right hemisphere.