Parkinson's disease involves degeneration of dopamine-containing neurons in the substantia nigra, leading to deficits in smooth movement, motivation, and reward pathways.

“these neurons contain dopamine and are essential for the generation of smooth movement patterns including walking and reaching and moving um one's hand to write Etc and of course dopamine is involved in a bunch of other things too including motivation and reward in people with Parkinson's depending on how severe and advanced the Parkinson's is they suffer deficits in the ability to generate smooth movements and often deficits in motivation and reward Pathways as well”

“let's talk about Parkinson's disease a depletion of dopamine neurons that leads to difficulty in smooth movement Generation Um and also some cognitive and mood-based um dysfunction”