According to internal
documents obtained by the Physician’s Committee for Responsible Medicine (PCRM), an advocacy group that works to eliminate animal testing, researchers “pried” and “drilled” open the animals’s skulls in order to implant the chips, as well as used
unapproved adhesive called BioGlue to seal the holes in their skulls. After the surgical procedures, the monkeys displayed signs of severe stress and exhaustion and a host of physical ailments, including diarrhea, open sores, vomiting, vaginal discharges and brain hemorrhaging.
Neuralink ultimately ended its partnership with UC Davis in 2020 and moved its animal testing to internal departments.
But between 2018 and 2022, the company experimented on and killed 1,500 animals, according to a report from Reuters.