Significant differences in GM volume between IGA and HC subjects. The results show IGA subjects had higher GM volume in the right inferior temporal gyrus, right parahippocampal gyrus, and right middle temporal gyrus, and lower GM volume in the left precentral gyrus (P <0.001, cluster size was set at >100 voxels). T-values are color-coded on the right. Blue indicates IGA group < HC, yellow indicates IGA group > HC. *The left part of the figure represents the patient’s right side. *HC, healthy control. IGA, internet gaming addiction.