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4: e5996. 239. Pfeiffer T, D Rand, A Dreber (2009). Decision-making in research tasks with sequential testing. PLoS ONE 4: e4607. 240. Rand DG, A Dreher, T Ellingsen, D Fudenberg, MA Nowak (2009). Positive interactions promote public cooperation. Science 325: 1272-1275. 241. Rand DG, A Dreher, T Ell

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does and doesn't do. Current Opinion in Pharmacology, 7, 69- 76; Doya, K. (2008). Modulators of decision making. Nature Neuroscience, 11(4), 410-416; Dreher, J.-C., Kohn, P., Kolachana, B., Weinberger, D. R., & Berman, K. F. (2009). Variation in dopamine genes influences responsivity of the human reward s