This is about the device by the University of Michigan (Susan Shore's team):
"The brain, and specifically the region of the brainstem called the dorsal cochlear nucleus, is the root of tinnitus," said Susan Shore, the U-M Medical School professor who leads the research team. "When the main neurons in this region, called fusiform cells, become hyperactive and synchronize with one another, the phantom signal is transmitted into other centers where perception occurs.
"If we can stop these signals, we can stop tinnitus. That is what our approach attempts to do, and we're encouraged by these initial parallel results in animals and humans."
[...]
This sets off a process called stimulus-timing dependent plasticity, or STDP, which was first explored in animals and led to long-term changes in the rate at which the nerves fire.
The approach aims to reset the activity of fusiform cells, which normally help our brains receive and process both sounds and sensations such as touch or vibration—what scientists call somatosensory inputs.
Link to the article with videos