ISSN : 1229-067X
The neuroanatomical correlates of personality traits in individuals with internet gaming overuse were investigated using voxel-based morphometry (VBM). High-resolution T1-weighted whole-brain images and questionnaires measuring impulsivity, depression, and personality traits were collected from 18 young male adults with internet gaming overuse (IOs; 22.2 ± 2.0 years) and 20 normal controls (NCs; 21.2 ± 2.2 years). We examined 1) the regional gray matter volume (rGMV) difference between groups and 2) group difference in the relationship between rGMV and the scores on the psychological tests. The IO group showed greater rGMV in the bilateral primary motor cortex, relative to the NC group. Significant interaction effects were found between personality traits and groups on rGMV, showing that the IO group exhibited negative correlations between impulsivity and rGMV in the left cerebellum, and between reward responsiveness scales and rGMV in the bilateral amygdala and right precuneus. These findings suggest a structural adjustment in the motor cortex due to internet gaming overuse, and structural abnormalities in brain regions associated with inhibitory motor control and reward processing for individuals at-risk for internet gaming disorder.
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