Federal agencies are encouraging alternatives to animal experiments, but neuroscientists caution that some questions about vision, movement and cognition still require studying living primates.
The United States is entering an important transition in biomedical research. Federal health agencies are encouraging scientists to develop human-cell technologies, organoids and computational models that could replace certain animal experiments. At the same time, researchers warn that modern substitutes do not yet reproduce every function of a living brain.
An October 9, 2026, investigation by The Transmitter examined what a substantial decline in nonhuman primate research could mean for neuroscience. Its reporters reviewed research and government records and consulted more than 40 scientists across their series.
The distinction is critical: the federal government has not prohibited all research involving nonhuman primates. Rather, researchers and institutions are reassessing which studies require animals, what alternatives can do reliably, and how quickly existing research programs should change.
Washington is changing its approach to animal testing
In 2025 the National Institutes of Health announced an initiative to prioritize human-based research technologies while reducing reliance on laboratory animals. NIH subsequently created the Office of Research Innovation, Validation, and Application (ORIVA) on June 15, 2026 to help develop, validate and expand what scientists call New Approach Methodologies, or NAMs.
NAMs include engineered human tissues, organ-on-a-chip devices, advanced cell cultures and computational models. Their promise is that models based on human biology may sometimes better predict human responses than animal experiments.
On September 21, 2026, the Food and Drug Administration announced a direct final rule clarifying that non-animal methods can be used, where appropriate, in nonclinical drug-safety testing. The agency’s position does not establish that every animal study can already be replaced.
Why primates remain important to neuroscience
Rhesus macaques, marmosets and other nonhuman primates have neurological and behavioral similarities to humans. Studies involving them have helped researchers investigate sight, fine movement, learning, memory, decision-making and other features of the brain that are difficult to reproduce in simpler systems.
In a companion investigation, The Transmitter asked 17 neuroscientists what questions could remain unanswered if support for primate research declines. The scientists pointed to problems such as understanding detailed visual processing, how the brain controls reaching and grasping, and how neural circuits support flexible behavior.
That does not prove that all animal experiments are necessary. It means the value of each model must be judged against the specific research question, the quality of alternatives and the potential harms.
Related coverage: Khemetic.News previously examined why laboratory-grown human brain tissue cannot yet replace every animal experiment. This article examines the broader federal-policy and research-center transition.
What brain organoids can—and cannot—do
Scientists can grow three-dimensional arrangements of human cells called brain organoids to study aspects of brain development and disease. Some experiments join different organoids into more complex structures known as assembloids, offering a way to observe interactions between cell populations.
Organoids have major limitations. They do not reproduce the full brain’s sensory inputs, circulation, connectivity or behavior in the way a living organism does. The organoid research installment in The Transmitter‘s series explores both the advances and unresolved challenges.
For studies of particular cell types or developmental pathways, an organoid may be highly useful. It cannot by itself reveal how a monkey or human navigates a complex environment, makes decisions or coordinates movements.
Oregon offers a real-world test of the transition
In July 2026, the Oregon Health & Science University board approved a framework to gradually reduce the approximately 4,500 monkeys at its Oregon National Primate Research Center and invest more heavily in non-animal approaches.
Oregon Public Broadcasting reported that the plan had no final reduction target or timetable. The center intended to preserve some funded and specialized primate studies while shifting toward methods such as human-cell models and computational research.
Its experience illustrates the difficulty of the transition. Facilities still need to care for animals, support existing scientific commitments and fund work to determine whether proposed alternatives accurately predict living biology.
Animal welfare and human health are both at stake
Animal-welfare advocates argue that invasive experiments involving intelligent, socially complex primates carry significant moral costs. They say research programs should not continue animal use simply because it is familiar or institutionally established.
Some neuroscientists, meanwhile, caution that removing primate research without validated substitutes could interrupt studies of neurological disease, sensory processing and motor function.
For patients, the important question is whether a new testing method yields reliable evidence for treatments and safety. Human-based methods could improve drug development where they more accurately reflect human biology; poorly validated methods could also create gaps in what scientists know.
What happens next?
The next steps will depend on research funding, rigorous comparison of older and newer methods, agency guidance and decisions at major research centers. Government interest in alternatives is real, but the precise pace and scope of replacing primate experiments remain uncertain.
America’s challenge is to reduce unnecessary animal experimentation without exaggerating what replacement technologies can already accomplish. That requires transparent evidence, strong animal-welfare safeguards and careful evaluation of whether each research tool is fit for its purpose.
Watch: Federal discussion of alternatives to animal testing
Watch the original FDA workshop directly on YouTube.
Sources and further reading
- The Transmitter — What if nonhuman primate research goes away? (October 9, 2026)
- The Transmitter — The neuroscience questions that need nonhuman primates
- The Transmitter — Human brain organoids come of age
- NIH — New office to advance human-based research (June 15, 2026)
- FDA — Regulatory update on alternatives to animal testing (September 21, 2026)
- Oregon Public Broadcasting — OHSU’s primate-research transition (July 27, 2026)
Featured photograph: Macaques in an animal research enclosure, 2012. Understanding Animal Research / Wikimedia Commons, CC BY 2.0. Not a photograph of the Oregon center.
