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Experimental setup for electrical stimulation and optical recordings on the median nerve. Optical recordings were performed with: (a) a two-wavelength (690 and 830 nm) tissue spectrometer in the vascular occlusion protocol (PMT: photomultiplier tube detector); (b) a spectral setup for broadband spectral measurements (over the wavelength range 650-900 nm) in the spectral characterization study (CCD: charge coupled device).
