Looks like a high quality study, albeit small. There is a good summary here https://www.newscientist.com/article/2494421-bespoke-brain-implant-gives-long-term-r

Looks like a high quality study, albeit small. There is a good summary here https://www.newscientist.com/article/2494421-bespoke-brain-implant-gives-long-term-relief-from-chronic-pain/ https://www.newscientist.com/article/2494421-bespoke-brain-i...