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Experimental setup to validate the fNIRS instrument; two optode modules were connected together with a rapid-prototyped element that ensures an SDS distance of 40 mm. (a) Validation measurements performed on a silicone phantom. (b) Occlusion measurement on the left forearm. (c) Placement of two modules next to C3 (white circle) for measuring cerebral hemodynamics from primary motor cortex during a finger-pinching task.
