Fig. 2: Results of the multiple regression analysis between OXTmi and the regional gray matter volume (GMV).

A Brain region showing negative correlations between the degree of OXTmi and GMV in the left SPL (x = −17, y = −56, z = 65 [BA 7], T = 4.50, cluster size = 157 voxels) as determined by the multiple regression analysis. The statistical threshold for the contrasts was voxel-level P < 0.001 uncorrected for height and cluster-level P < 0.05 FDR-corrected for multiple comparisons. The color bar denotes the t-statistic range. B Brain activation map based on a meta-analysis of 118 studies related to the term “action observation,” which was the most significant term associated with the left SPL revealed by “NeuroSynth” [40].