It is oriented to a general audience. However, it’s useful to review the brain reward system and some important dopamine pathways.
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Addiction, Dopamine, and the Molecular Mechanisms of Memory. Neuron, Vol. 25, 515–532, March, 2000. Free Full Text – PDF -
Is there a common molecular pathway for addiction? EJ Nestler – Nature neuroscience, 2005. Free Full Text – PDF -