Along with tDCS, other new methods of NBS are being investigated across various disease states. One such study looked at the impact of tES on tinnitus. They tested whether type of tES made a difference in efficacy. They compared tDCS to tRNS. tRNS is very similar to tDCS except that it superimposes a random "white noise" gaussian waveform (from 0.1 hz to 640 hz) on top of the DC current. They found that tRNS induced a larger suppressive effect on tinnitus loudness and tinnitus-related distress when compared to tDCS. While their findings were in tinnitus, there are now multiple scholarly works describing a relationship of tinnitus and AH, possibly as a continuum or dimension underlying a variety of normal and disease states. This relationship suggests strategies found to be efficacious for tinnitus may in fact also be efficacious for AH. Recently, there was a case series showing possible efficacy in AH using tRNS.