A technique based on AI can translate brain scans into words and sentences.
. With those data, the researchers produced a set of maps for each subject that specified how the person’s brain reacts when it hears a certain word, phrase, or meaning. Because fMRI takes a few seconds to record brain activity, it captures not each specific word, but rather the general idea with each phrase and sentence, Huth says. His team used the fMRI data to train the AI to predict how the brain of a certain individual would react to language.
Afterward, the subjects listened to podcasts not used in the training. And little by little, the system produced words, phrases, and sentences, eventually producing ideas that accurately matched what the person was hearing. The technology was particularly good at getting the gist of the story, even if it didn’t always get every word right.
The system could someday aid individuals who have lost their ability to communicate because of brain injury, stroke, or locked-in syndrome, a type of paralysis in which individuals are conscious but paralyzed. However, that will require not only advancing the technology by using more training data, but also making it more accessible.
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