Fig. 2From: Clinical implications for dopaminergic and functional neuroimage research in cognitive symptoms of Parkinson’s diseaseInverted U-shaped curve relationship between striatal dopamine level and the behavioral, cognitive performance. The effect of dopaminergic treatment (OFF: without medication, ON: with medication) in the cognitive performance differs by the baseline striatal dopamine level and the catechol-O-methyl transferase (COMT) activity, depending on its gene variantBack to article page