Helmich, I., Holle, H., Rein, R., & Lausberg, H. (2015). Brain oxygenation patterns during the execution of tool use demonstration, tool use pantomime, and body-part-as-object tool use. International journal of psychophysiology : official journal of the International Organization of Psychophysiology, 96(1), 1-7 . https://doi.org/10.1016/j.ijpsycho.2015.03.001