How fast to work: Response vigor, motivation and tonic dopamine.

Yael Niv Nathaniel D. Daw Peter Dayan How fast to work: Response vigor, motivation and tonic dopamine. 2005 conf/nips/2005 NIPS http://books.nips.cc/papers/files/nips18/NIPS2005_0527.pdf db/conf/nips/nips2005.html#NivDD05