Have you tried reading the article? Because he literally gave himself severe brain damage / trauma from the operation: """ At first the procedure that

Have you tried reading the article? Because he literally gave himself severe brain damage / trauma from the operation: """ At first the procedure that Kennedy hired Cervantes to perform—the implantation of a set of glass-and-gold-wire electrodes beneath the surface of his own brain—seemed to go quite well. There wasn’t much bleeding during the surgery. But his recovery was fraught with problems. Two days in, Kennedy was sitting on his bed when, all of a sudden, his jaw began to grind and chatter, and one of his hands began to shake. Powton worried that the seizure would break Kennedy’s teeth. His language problems persisted as well. “He wasn’t making sense anymore,” Powton says. “He kept apologizing, ‘Sorry, sorry,’ because he couldn’t say anything else.” Kennedy could still utter syllables and a few scattered words, but he seemed to have lost the glue that bound them into phrases and sentences. When Kennedy grabbed a pen and tried to write a message, it came out as random letters scrawled on a page. At first Powton had been impressed by what he called Kennedy’s Indiana Jones approach to science: tromping off to Belize, breaking the standard rules of research, gambling with his own mind. Yet now here he was, apparently locked in. “I thought we had damaged him for life,” Powton says. “I was like, what have we done?” """ """ Kennedy’s recovery had continued to go poorly: The more effort he put into talking, the more he seemed to get locked up. And no one from the US, it became clear, was coming to take the doctor off Powton and Cervantes’ hands. """ From that description: - Motor control impairment - Extreme language impairment to the point that subject is unable to write coherently - Literal fucking seizures - Possible prefrontal damage While it was just "postoperative brain swelling" and the brain "can heal". It's unlikely that he made a completely full recovery, indeed later in the article it is alluded that he has permanent motor damage: """ When I meet Kennedy there one day in May 2015, [...] Kennedy says with a slight Irish accent [...] “The retractor pulled on a branch of the nerve that went to my temporalis muscle. I can’t lift this eyebrow.” Indeed, I notice that the operation has left his handsome face with an asymmetric droop. """ And likely, prefrontal damage from his inability to refrain from commenting the first thing on his mind[0]: """ Kennedy said when we first started watching the video. But now he deviates from our discussion about evolution to bark orders at the screen, like a sports fan in front of a TV. “No, don’t do that, don’t lift it up,” Kennedy says to the pair of hands operating on his brain. “It shouldn’t go in at that angle,” he explains to me before turning back to the computer. “Push it in more than that!” he says. “OK, that’s plenty, that’s plenty. Don’t push anymore!” """ The reporter later refers to his "garbled answer", indicating that he still has language formation problems, and that actually seems well-indicated from the snippets of quotes we see from him. [0]: https://en.wikipedia.org/wiki/Frontal_lobe_injury https://en.wikipedia.org/wiki/Frontal_lobe_injury