Paralyzed people may now be able to 'handwrite' with their minds using AI imagination, researchers have almost doubled the speed at which completely paralyzed patients can communicate with the world.

In new experiments, a volunteer paralyzed from the neck down imagined moving his arm to write each letter of the alphabet. That brain activity helped train a computer model known as a neural network to interpret the commands, tracing the intended trajectory of his imagined pen tip to create letters.

Eventually, the computer could read out the volunteer’s imagined sentences with roughly 95% accuracy at a speed of about 66 characters per minute, the researchers reported at the annual meeting of the Society for Neuroscience.

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