Abstract
Exogenous activation of the mesolimbic dopamine system facilitates motivated behavior. However, a direct relationship has not been established between endogenous phasic dopamine transmission and measures of motivation, such as the vigor to initiate an action and the effort exerted in a bout of activity. The present work demonstrates that the dopamine response when initiating an action depends both upon where dopamine is released and what action is performed. Furthermore, dopamine reflects measures of motivated behavior selectively within the nucleus accumbens core.
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