Quick - Think of cheesecake!

DA is released when we work towards something we think is rewarding - a video game or desire for something tasty. 

DA is released while predicting and craving rewards, not so much while experiencing it. The process : 

1. Release in Planning Network in Pre-frontal Cortex (does most of the thinking)
2. Release in Motivation Generating Network in Striatum

Parts of the striatum read motivational variables & push you to act on them. This can sometimes go awry - depending on the path and timing of this DA release, you may feel motivated to carry on a task like reading a book or you just don’t feel like it.