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Device That Turns Thoughts into Sounds Developed
Over the past two decades, the team has developed models that predict how neurons in this region fire during speech.
They used these predictions to translate the firing patterns of several dozen brain cells in Ramsey's brain into the acoustical building blocks of speech.
"It's a very subtle code; you're looking over many neurons. You don't have one neuron that represents 'aaa' and another that represents 'eee'. It's way messier than that," said Guenther.
Next, Guenther's team provided Ramsey with audio feedback of the computer's interpretation of his neurons, allowing him to tune his thoughts to hit a specific vowel.
Over 25 trials across many months, Ramsey improved from hitting 45 per cent of vowels to 70 per cent.
While the ability to produce three distinct vowels from brain signals won't allow for much communication, but Guenther has said that technological improvements should have a next-generation decoder producing whole words in three to five years.
This next device will read from far more neurons and so should be able to extract the brain signals underlying consonants, he said.
The team plan to have it controlled by a laptop, so people can practise speaking at home as much as they like.
The study has been published in the journal PLoS One.
Source-ANI
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