The billionaire said the person had the chip surgically implanted into their brain on Sunday and "is recovering well" 

"Initial results show promising neuron spike detection," Musk wrote on X, the social media he owns. 

The US Food and Drug Administration last year greenlit human trials of the company's brain chips after Neuralink performed hundreds of tests on pigs, sheep and monkeys — and was called out for animal abuse by animal rights groups in the process.