Researchers have found a tiny mechanism deep inside the ear that likely helps us hear whispers. The finding could eventually help companies design better hearing aids and other devices for restoring hearing.
Scientists probed the cochlea, a part of the inner ear where physical sound is translated into electrical signals for the brain.
Hovering right above all of this is the tectorial membrane, along which a different kind of sound wave travels, the scientists discovered. This wave—which bounces from side to side—can excite the hair cells and also enhance their sensitivity, which MIT researcher Roozbeh Ghaffari noted, may help explain how we can pick up on sounds that are as quiet as a whisper.
This finding, Ghaffari says, has major implications for our understanding of how hearing works and potentially for hearing devices currently on the market.
“Most hearing aids we have now are terrible in that they just amplify and blast everything,” Ghaffari said. “Our ears are smarter than that and knows tricks that help us distinguish sounds. Having a better model for cochlear mechanics can lead to improved hearing aids and cochlear implants.”
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