There is provided a neural interface device (10) for unidirectional stimulation of a nerve comprising at least one A-type nerve fibre or at least one at least partially myelinated nerve fibre. The device comprises an electrode arrangement (15) for placing on or around the nerve. The electrode arrangement (15) comprises a first electrode (11) configured to be positively charged and a second electrode (12) configured to be negatively charged, where the surface area of the second electrode is larger than the surface area of first electrode.
