Anyone who has ever been in a loud environment knows it’s hard to focus on a single noise. That’s called the “cocktail party effect,” where conversations overlap one another. Conventional hearing aid users generally struggle to hear clearly in these situations.
A new brain-controlled hearing aid can allow listeners to isolate a single voice in a noisy environment. The technology senses real-time brain signals to ID which person the listener is focusing on and amplifies just that voice. Traditional hearing aids amplify everything. But this new hearing aid technology uses the person’s brain wave pattern to match them to the conversation they are following and amplify that.
We recently wrote about an exercise study that piggybacked off of electrodes implanted in the brains of people with epilepsy. This study did the exact same thing. All the participants had epilepsy and pre-implanted electrodes that could be used to test the new technology. They found that people could hear speech more clearly without having to “listen harder.” And it worked when people were directed to a speaker and when they picked a conversation organically — mimicking how real-world interactions occur.
“We have developed a system that acts as a neural extension of the user, leveraging the brain’s natural ability to filter through all the sounds in a complex environment to dynamically isolate the specific conversation they wish to hear,” said senior author Dr. Nima Mesgarani, a principal investigator at Columbia’s Zuckerman Institute. “This science empowers us to think beyond traditional hearing aids, which simply amplify sound, toward a future where technology can restore the sophisticated, selective hearing of the human brain.”
The researchers at Columbia teamed up with surgeons and epilepsy patients who were having brain surgery to pinpoint their seizures. Using the electrodes, the technology could make one noise louder in a person’s head while softening the surroundings.
People in the study were so amazed by what they were hearing, they thought it was being faked. They believed the researchers were manually changing the sounds. Some were excited about what the technology could do for their loved ones with hearing concerns. One person compared it to science fiction.
The researchers are working toward a hearing aid. This study shows that the technology is possible, but the electrodes were surgically implanted in the participants. The team noted that work is needed to turn this technology into a wearable, minimally invasive hearing aid.
“The results mark an important step toward a new generation of brain-controlled hearing technologies that align with the listener’s intent, potentially transforming how people navigate noisy, multi-talker environments,” said the paper’s first author, Dr. Vishal Choudhari.
