as norepinephrine is reduced in the brain in pd and this neurotransmitter has been related to attention and learning , we investigated the relationship of neuropsychological measures , including those of reaction time and vigilance , to the norepinephrine metabolite 3-methoxy - 4 - hydroxyphenethyleneglycol ( mhpg ) in 39 patients with idiopathic pd .
C0006104
brain
C0023185
learning