The pallidum as gateway to subconscious drives, possibly relevant to Parkinson's, addiction

I haven't even heard of this brain part (of the basal ganglia) known as the pallidum, but it seems to light up even with subliminal flashes. This whole subconscious access thing has some implications in addiction treatment as well as willful control in Parkinson's.

Severely affected patients who can hardly walk across the room have been known to walk briskly outdoors in response to a fire alarm. Walking may require both a conscious drive and a subconscious motivation that is amiss in Parkinson's, perhaps because of abnormalities in the pallidum and its associated neural circuitry.