Weiskopf, N., Veit, R., Erb, M., Mathiak, K., Grodd, W., Goebel, R., et al. (2003).
Physiological self-regulation of regional brain activity using real-time functional magnetic resonance imaging (fMRI): Methodology
and exemplary data. NeuroImage, 19(3), 577-586. doi:10.1016/S1053-8119(03)00145-9.