Preuschoff, Kerstin, Peter Bossaerts, and Steven R. Quartz. 2005. “Neural differentiation of expected reward and risk in human subcortical structures.” Neuron 51:381–90; Preuschoff, Kerstin, Steven R. Quartz, and Peter Bossaerts. 2008. “Human insula activation reflects risk prediction errors as well as risk.” The Journal of Neuroscience 28:2745–52.