Important Neurotransmitters and their Function
Excerpts from "Mapping the Mind", Rita Carter
Controls arousal levels in many parts of the brain and is vital for giving physical motivation. When levels are severely depleted, as in Parkinson's disease, people may find it impossible to move forward voluntarily. Low dopamine may also be implicated in mental stasis. LSD and other hallucinogenic drugs are thought to work on the dopamine system.