A completely paralyzed man has been able to communicate entire sentences using a device that records his brain activity. The man was able to train his mind to use the device, which was implanted in his brain, to ask for massages, soup, and beer, and to watch films with his son. It is the first time a completely locked-in person—someone who is conscious and cognitively able but completely paralyzed— has been able to communicate in this way, say the researchers behind the work. Brain-computer interfaces record the electrical signals inside a person’s brain and convert them to commands that control a device. In recent years, BCIs have enabled partially paralyzed people to control prosthetic limbs or…
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