At the University of Minnesota, reports about invasive brain experiments on monkeys have sparked alarm over both the suffering involved and the oversight that allowed it to continue. Accounts published by PETA describe monkeys subjected to skull drilling, implanted hardware, repeated surgical complications, and prolonged distress.
Monkeys at the University of Minnesota were reportedly subjected to invasive brain experiments.
These experiments reportedly involved cutting into monkeys’ scalps, removing part of the skull, attaching headposts and cranial recording chambers, and implanting electrodes or other devices that allowed repeated access to the brain over months or years, PETA Headlines reports. The animals were then allegedly restrained and forced to perform visual or behavioral tasks while researchers collected neurological data, according to National File.
One monkey allegedly had screws drilled so deep into his skull that they pierced his brain.
Everett’s Reported Suffering Was Hard To Ignore
One of the most disturbing cases involved a rhesus macaque named Everett. According to PETA, insiders alleged that roughly 20 screws drilled into Everett’s skull went so deep they pierced his brain. They also said he became lethargic, vomited, showed abnormal eye movement, shook his head violently, and pressed his head against the bars of his cage, behavior that suggested severe pain and neurological distress.
PETA reported that staff concerns about Everett’s condition were not promptly addressed. Insiders alleged that scan results and internal notes were withheld or deleted, and that a veterinarian did not receive full access to the information right away. Everett was eventually killed, but only after weeks of reported agony.
Other Monkeys Reportedly Endured Trauma And Repeated Surgeries
Everett was not the only monkey whose case raised alarm. PETA reports a monkey named Gandalf whose headpost was allegedly sheared off during a cage transfer, ripping it from his skull. He reportedly endured the initial trauma and then two additional surgeries.
Another monkey, Bilbo, allegedly suffered a cascade of surgical complications. According to PETA, a chamber was placed incorrectly, a second surgery followed, and Bilbo’s brain was reportedly punctured during the effort to correct the first procedure. During that same operation, a metal bar allegedly jammed into his eye after his head slipped from the restraint device. Later, infection weakened implanted hardware, and the recording chamber reportedly detached, exposing his brain.
Implanted Hardware Can Mean Chronic Pain And Constant Risk
These reports point to a deeper problem with invasive primate brain research itself. When metal and ceramic hardware are fixed to a monkey’s skull, the risk does not end after surgery. PETA described infection as a recurring problem in the university’s monkey laboratories. Infection can degrade tissue and bone, destabilize implants, and lead to more surgery, more restraint, and more suffering.
National File also reported that taxpayer-funded research support helped sustain some of this work, including projects linked to implanted devices and toxic brain injections. That raises serious public accountability questions alongside the ethical ones.
The experiments involved skull implants, headposts, chambers, and direct brain access.
The University Must Choose Humane Science
The most troubling part of this story may be how many warning signs were reportedly ignored. Staff concerns were allegedly brushed aside. Oversight systems failed to stop the harm before it escalated. Monkeys who showed signs of pain, infection, injury, and neurological distress still remained trapped in these experiments, according to PETA.
Monkeys are intelligent, social animals. They should not be reduced to test platforms for drilled skulls, exposed brain tissue, implanted hardware, and repeated trauma. The University of Minnesota should end these experiments, remove Jan Zimmermann from any role involving animal experimentation, and move toward modern research methods that do not rely on this kind of suffering.
