Heather Bortfeld published an article on fNIRS applications in the domain of human brain function. Appears in flagship journal for Society for Near-Infrared Spectroscopy (SfNIRS) and provides a comprehensive overview.
https://www.spiedigitallibrary.org/journals/neurophotonics/volume-9/issu...
Ayaz, H., Baker, W. B., Blaney, G., Boas, D. A., Bortfeld, H., Brady, K., Brake, J., Brigadoi, S., Buckley, E. M., Carp, S. A., Cooper, R. J., Cowdrick, K. R., Culver, J. P., Dan, I., Dehghani, H., Devor, A., Durduran, T., Eggebrecht, A. T., Emberson, L. L., Fang, Q., … Zhou, W. (2022). Optical imaging and spectroscopy for the study of the human brain: status report. Neurophotonics, 9(Suppl 2), S24001.