1. Aron, A. R., Shohamy, D., Clark, J., Myers, C., Gluck, M. A., & Poldrack, R. A. (2004). Human midbrain sensitivity to cognitive feedback and uncertainty during classification learning. Journal of Neurophysiology, 92, 1144–1152.
2. Ashby, F. G., & Maddox, W. T. (2005). Human category learning. Annual Review of Psychology, 56, 149–178.
3. Daniel, R. & Pollmann, S. (2010). Comparing the Neural Basis of Monetary Reward and Cognitive Feedback during Information-Integration Category Learning. The Journal of Neuroscience, 30(1), 47–55.
4. Smith B. W., Mitchell D. G. V., Hardin M. G., Jazbec S., Fridberg D., Blair R.J.R. & Ernst M. (2009). Neural substrates of reward magnitude, probability, and risk during a wheel of fortune decision-making task. Neuroimage 44, 600–609.