Method for obtaining near-infrared spectroscopy cerebral signal

Abstract

A method for obtaining a near-infrared spectroscopy (fNIRS) cerebral signal in a subject includes: placing a near-infrared emitter and respective proximal and distal near-infrared detectors on a skin of a head of a subjecl; during a baseline recording stage wilh the subject in restingstate, record near-infrared signals, the recorded signals including a baseline deep-signal and a baseline shallowsignal; calculate a scaling factor belween amplitudes of the baseline deep-signal and the baseline shallow-signal at a given task-frequency; with the subject undergoing a cyclic cerebral stimuJation at the task-frequency during a stimulation recording stage, record near-infrared signals, the recorded signals comprising a shallow-signal and a deepsignal; and applying the scaling factor to the shallow-signal, calculating the cerebral signa] at the task-frequency as a difference between the deep-signal and the scaled shallowsignal, at the task-frequency.