Bethesda, Maryland–(ENEWSPF)–July 11, 2011. Researchers have long known that dopamine, a brain chemical that plays important roles in the control of normal movement, and in pleasure, reward and motivation, also plays a central role in substance abuse and addiction. In a new study conducted in animals, scientists found that a specific dopamine receptor, called D2, on dopamine-containing neurons controls an organism’s activity level and contributes to motivation for reward-seeking as well as the rewarding effects of cocaine.
