Electric Shocks To the Tongue Can Quiet Chronic Ringing Ears
Scientists have shown shocking the tongue -- combined with a carefully designed sound program -- can reduce symptoms of tinnitus, not just while patients are being treated, but up to 1 year later. Science Magazine reports: In the team's experiment, 326 people with tinnitus sat for up to 1 hour at a time with a small plastic paddle on their tongue. Tiny electrodes in the paddle delivered an electrical current designed to broadly excite the brain, getting activity going through a number of interconnected regions. The electrical stimulation feels a little like pop rocks candy fizzing in your mouth, [says Hubert Lim, a biomedical engineer at the University of Minnesota, Twin Cities]. Subjects also wore headphones that delivered a more targeted hit to the brain's auditory system. Each person heard a rapidly changing series of pure tones at different frequencies, against a background noise that sounds "kind of like electronic music," Lim says. The goal of the two together was to distract the brain by heightening its sensitivity, forcing it to suppress the activity that causes tinnitus. "The brain can only pay attention to so many things," Lim says. Over the 12 weeks of treatment, the patients' tinnitus symptoms improved dramatically. More than 80% of those who complied with the prescribed regimen saw an improvement. And they saw an average drop of about 14 points on a tinnitus severity score of one to 100, the researchers report today in Science Translational Medicine. When the team followed up after 12 months, 80% of the participants still had lower tinnitus scores, with average drops of 12.7 and 14.5 points.
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