Neural basis of the undermining effect of extrinsic reward on intrinsic motivation.

Murayama, K., Matsumoto, M., Izuma, K., & Matsumoto, K. (2010). Neural basis of the undermining effect of extrinsic reward on intrinsic motivation. Proceedings of the National Academy of Sciences of the United States of America, 107(49), 20911-20916. PDF   Online Article