For ten points, name this neurotransmitter, which is inextricably linked with movement, learning, the brain's reward center, drug addiction, and Parkinson's disease.
Originally thought to have two types of receptors, recent studies suggest it has at least five. It was not recognized as a primary neurotransmitter until the 1950s, when the demonstration of its nonuniform distribution in the brain suggested a functional role. One of its primary transmission systems, the nigrostriatal system, governs the portion of the brain responsible for voluntary movements Its neurons are dysfunctional in cases of ADHD, and it is the neurotransmitter most affected by stimulants such as cocaine. For ten points, name this neurotransmitter, which is inextricably linked with movement, learning, the brain's reward center, drug addiction, and Parkinson's disease.
Originally thought to have two types of receptors, recent studies suggest it has at least five.
dopamine