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Experimental set-up and design. Left: Positions of the ring electrode used for experimental conditioning and the concentric electrode (CE) used to apply the electrical pinprick-like test stimuli. The conditioning electrode was placed 5 cm and the concentric electrode 7 cm from the cubita fossa. The mechanical punctate test stimuli were delivered between 6 and 7 cm from the cubita fossa on the distal axis. Right: Time-table of the experiment.
