Zentgraf, K., Stark, R., Reiser, M., Künzell, S., Schienle, A., Kirsch, P., Walter, B., Vaitl, D., & Munzert, J. (2005). Differential activation of pre-SMA and SMA proper during action observation: Effects of instructions. NeuroImage, 26(3), 662–672. https://doi.org/10.1016/j.neuroimage.2005.02.015