Northoff, G., Walter, M., Schulte, R., Beck, J., Dydak, U., Henning, A., Boeker, H., Grimm, S., & Boesiger, P. (2007).
GABA concentrations in the human anterior cingulate cortex predict negative BOLD responses in fMRI.
Nature Neuroscience, 10(12), 1515-1517. doi:10.1038/nn2001.