The correlation between YIAS scores and perseverative responses and the levels of NAA in the right frontal cortex of PGA subjects A. The correlation between YIAS scores and the level of NAA in the right frontal cortex in patients with online game addiction (PGA) Pearson correlation, r = −0.62, p < 0.01, B: The correlation between perseverative error (PE) and the level of NAA in right frontal cortex in PGA, Pearson correlation, r = −0.42, p < 0.01, when two extreme PE values were removed, the correlation is r = −0.58, p < 0.01, NAA: N-acetyl-aspartate, YIAS: Young Internet Addiction Scale Score.