JANUARY 2018– Our paper updating the thrift hypothesis of dopamine was published in Frontiers in Integrative Neuroscience. Beeler, J.A., and Mourra, D. (2018). To Do or Not to Do: Dopamine, Affordability and the Economics of Opportunity. Frontiers in Integrative Neuroscience 12. https://doi.org/10.3389/fnint.2018.00006