In the description linked to below, there is a description saying:
“At this stage we can quantify the quality of the coupling between the scalp and the optodes using the scalp coupling index. This method looks for the presence of a prominent synchronous signal in the frequency range of cardiac signals across both photodetected signals.”
The two photodetected signals referred to, is that the hemo and oxy signals?
Thanks in advance!
[Preprocessing functional near-infrared spectroscopy (fNIRS) data — MNE 1.7.0 documentation]