This book presents information from different scientific disciplines - behavioral, biochemical, electrophysiological, anatomical, and medical - to detail the interaction of the neurotransmitter dopamine (DA) with other neurotransmitters or neuromodulators in the brain. Internationally recognized experts discuss the interaction of DA with monoaminergic transmitters such as norepinephrine, GABA, acetylcholine, and serotonin, as well as neuropeptide neurotransmitters/neuromodulators such as neurotensin, cholecystokinin, and the opioid peptides. This is also the first book to include data from positron emission tomography (PET) studies examining the interaction of neurotransmitters in the brain.