Takahashi, Yuji, Matthew Roesch, Robert Wilson, Kathy Toreson, Patricio O’Donnell, Yael Niv, and Geoffrey Schoenbaum. (2011) 2011. “Expectancy-Related Changes in Firing of Dopamine Neurons Depend on Orbitofrontal Cortex”. Nature Neuroscience 14 (12): 1590–1597. doi:10.1038/nn.2957.