How were the researchers able to distinguish between light absorbed by the skin on the surface of the skull versus penetrating the skull to the surface of the brain in order to determine if the results shown were from epidermal versus direct cortical stimulation by the fNIRs sources?
Thank you
How were the researchers able to distinguish between light absorbed by the skin on the surface of the skull versus penetrating the skull to the surface of the brain in order to determine if the results shown were from epidermal versus direct cortical stimulation by the fNIRs sources?