Weil, R. S., Furl, N., Ruff, C. C., Symmonds, M., Flandin, G., Dolan, R. J., et al. (2010). Rewarding feedback after correct visual discriminations has both general and specific influences on visual cortex. Journal of Neurophysiology, 104, 1746-1757. doi:10.1152/jn.00870.2009.