Probes may be placed on the ‘standard’ EEG layout positions or in arbitrary positions. In either case, it is vital that one ensures proper spacing between probes, as probe distance effects light penetration and signal quality. NIRx offers hardware and software solutions that help ensure proper spacing.
NIRS layout in standard 10-5 positions
Right: a 16-source/16-detector NIRS layout for motor measurements
Each source is red, each detector is green, and each 'NIRS channel of interest' is purple.
In this case there are 48 NIRS channels from this 32-probe layout.
The montage to the right is a 'topographic' layout, with 3cm spacing between each probe.