Where do impulsive symptoms of Attention-deficit/hyperactivity disorder originate?

Where do impulsive symptoms of Attention-deficit/hyperactivity disorder originate? Orbital frontal cortex 5) Selective attention originates
from anterior cingulare cortex (ACC) vs sustained attention cortico-striatal-thalamic-cortical loop (CSTC)
[remember….this loop involves the dorsolateral prefrontal cortex] couple of questions on that…..