The oxygen saturation in the primary motor cortex during a single hand movement: functional near-infrared spectroscopy (fNIRS) studySemen Kurkin, Artem Badarin, Vadim Grubov, Vladimir Maksimenko and Alexander HramovEur. Phys. J. Plus, 136 5 (2021) 548DOI: https://doi.org/10.1140/epjp/s13360-021-01516-7