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Fig 2. A, The result of the regression analysis testing the correlation between gray matter density of the mathematicians and period of time spent as an academician is overlayed on the normalized T1-weighted images. They show that gray matter density in the right inferior parietal region (Talaraich coordinates: x = 57, y = –60, z = 34) of the mathematicians is strongly correlated with the duration of time spent as an academician (z = 7.28; P < .05, FWE corrected). B, The gray matter density values from the voxels showing the maximum correlation on the SPM regression analysis are extracted into SPSS. The scatter-plot graph shows the linear regression between the gray matter density and the duration of time spent as an academician (r = 0.84; P < .01). The middle line represents the linear regression, and the curves around it represent the 95% confidence intervals.
