A nerve implant that takes advantage of the brain’s plasticity to retrain hearing could cure tinnitus, providing relief to the one to two per cent of world population for whom the condition is a bad enough to require treatment.
Tinnitus, which is usually caused by exposure to loud noises but can also arise from normal aging, is thought to be caused by damage to the brain’s auditory cortex.
Neurons in different parts of the cortex activate when exposed to different frequencies, but when the sound being heard is extreme, the brain tries to compensate and block it out. It’s thought this can dull parts of the cortex while other areas become over sensitive – leading to the constant perception of sound when there is none.
The Serenity System developed by Texas-based company MicroTransponder aims to fix that by ‘retraining’ the cortex to hear all frequencies normally.
As reported by the New Scientist, the treatment consists of software that plays specific frequencies and an electronic cuff which is affixed to the vagus nerves – one of the twelve cranial nerves that connect the brain to the major organs.
The person receiving the treatment listens to various frequencies that stimulate their tinnitus while the cuff sends small electrical pulses down the vagus nerve. This triggers the release of chemicals that speed the brain’s capacity to remodel itself.
Trials of the treatment have been successful in rats and if human trials currently underway pan out the same MicroTransponder thinks the Serenity System could be offered to consumers from the middle of 2015. Listen out for more then.
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