Scientists identify neurochemical signal likely missing in Parkinson’s

Neuroscientists have identified the neurochemical signal likely missing in Parkinson’s disease by discovering two distinctly different kinds of neurons that deliver dopamine to an important brain region responsible for both movement and learning/reward behavior. The findings provide a new framework for understanding the role of the dopamine system in movement control and learning/reward and how dysfunction of the dopamine system can result in a range of neurological disorders.