Gruber AJ, Solla SA, Surmeier DJ, Houk JC. (2003). Modulation of striatal single units by expected reward: a spiny neuron model displaying dopamine-induced bistability. Journal of neurophysiology. 90 [PubMed]
Porr B, Wörgötter F. (2007). Learning with "relevance": using a third factor to stabilize Hebbian learning. Neural computation. 19 [PubMed]
Rivest F, Kalaska JF, Bengio Y. (2010). Alternative time representation in dopamine models. Journal of computational neuroscience. 28 [PubMed]