Phase-shift treatment for tinnitus of cochlear origin.

Phase-shift treatment is a new tinnitus therapy that aims at sound cancelling. This technique is based on a theory advocating that the induction of a sound wave with a 180 degrees phase-shift compared to the sound experienced by the patient could result in sound cancelling, likely by negation of the cortical perception of tinnitus or residual inhibition, which can be partial or complete. The aim of our study is to compare the effect of phase-shifting generated by the tinnitus phase-out device between pure tone tinnitus patients (PTP) and narrow band noise tinnitus patients (NBNP).