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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Public veterinary records from Neuralink’s historical monkey research describe serious complications in particular animals after brain-implant procedures. WIRED reported on those records in September 2023, including accounts of infection, pain-related behavior, impaired coordination, brain bleeding and damage to brain tissue. The cases differed, and the records do not show that every monkey experienced every complication.
What the records describe in three cases
WIRED’s account draws on public veterinary records from work conducted by Neuralink researchers at the California National Primate Research Center. The following are case-specific descriptions reported by WIRED, not a complete animal-by-animal dataset.
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| Animal | What WIRED reported from the veterinary records |
|---|---|
| Animal 20 | An implant component broke and was dislodged. The records described bloody discharge and infection afterward. |
| Animal 15 | The records described pain behavior, impaired coordination and shaking, as well as brain bleeding and damage to the cerebral cortex. |
| Animal 22 | The records described a loose cranial implant. |
WIRED also summarized records that mentioned bloody diarrhea, partial paralysis and cerebral edema. Its reporting does not establish that these effects occurred in the three animals listed above, nor does it attribute every effect to the implant itself.
How UC Davis described the research and oversight
In a statement dated February 9, 2022, UC Davis said its research agreement with Neuralink ended in 2020. The university said Neuralink researchers conducted the work at its California National Primate Research Center, while UC Davis staff provided veterinary care and round-the-clock monitoring.
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UC Davis said campus Institutional Animal Care and Use Committee (IACUC) protocols were reviewed and approved, and that incidents were reported to the IACUC. The university said the committee mandated training and protocol changes as needed. This is UC Davis’s account of the oversight process; it does not by itself resolve disputes about particular cases or what caused an animal’s condition.
How Neuralink explained euthanasia decisions
Neuralink’s animal-welfare statement gives the company’s account of the animals’ conditions and euthanasia decisions. It cites pre-existing conditions and describes reasons that included one surgical complication involving BioGlue, loose connecting hardware, and four suspected infections. Neuralink characterized infection as an inherent risk of percutaneous medical devices—devices that pass through the skin.
Those explanations should be understood as Neuralink’s characterization, not as a neutral finding that settles the cause of each complication. In particular, the available accounts differ over the significance of BioGlue and how it affected the animals.
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The Physicians Committee for Responsible Medicine (PCRM), an advocacy organization, filed a complaint with the U.S. Department of Agriculture on February 10, 2022. The complaint alleged chronic systemic infections, social isolation and psychological distress based on records PCRM reviewed. Those are allegations in a complaint, not an adjudicated USDA finding in the sources described here.
In its response to Neuralink’s account, PCRM cited records and a necropsy report concerning BioGlue. PCRM said BioGlue was found on two monkeys’ brains and quoted a necropsy description calling it toxic to adjacent tissues. It also argued that records showed a protocol deviation and delayed euthanasia in a particular case. These are PCRM’s interpretations of the records it cited; they are not presented here as regulator-confirmed conclusions.
What the accounts establish—and what remains unresolved
The public-record reporting supports a narrow but serious conclusion: veterinary records described significant complications in specific monkeys after implant procedures. The details vary by animal. They do not support a claim that every monkey suffered the same effects, or that all reported conditions had one established cause.
The sources also present competing interpretations of baseline health, the role of BioGlue and other complications, and the adequacy of care in particular cases. UC Davis described veterinary monitoring, IACUC review and corrective measures; Neuralink offered its explanation of euthanasia decisions; PCRM challenged that framing and made allegations in a USDA complaint. The sources summarized here do not establish the outcome of any later regulatory investigation or resolve every disputed causal claim.
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