Vagus Nerve Stimulation. It involved implantation of a bio electrode that stimulates the Vagus Nerve, aka the wandering nerve that connects to the brain stem. The belief is just as the brain learns tinnitus through cortical reorganization, that by playing paired tones in bursts, we can train the brain to filter tinnitus out. Whereas habituation is learning to accept tinnitus, VNS seeks to train the brain to literally ignore the perception. It's infantile science but the theory makes sense. MicroTransponder is currently conducting early phase research with such a system.