Andrew James Smith Suzanna Becker Shitij Kapur A Computational Model of the Functional Role of the Ventral-Striatal D2 Receptor in the Expression of Previously Acquired Behaviors. 361-395 2005 17 Neural Computation 2 http://neco.mitpress.org/cgi/content/abstract/17/2/361 db/journals/neco/neco17.html#SmithBK05