Welfare of Monkeys in Laboratory Neuroscience Research

Non-human primates are used in neuroscience research to study brain function and develop treatments for neurological conditions, with welfare implications that are among the most ethically contested in all animal research.

Key Facts

Approximately 70,000 non-human primates are used in research annually in the US, primarily macaques
Neuroscience primate research may involve surgically implanted electrodes, fluid restriction protocols, and months-long behavioural training
Fluid restriction, which motivates primates to perform tasks by limiting water access, is standard practice in many neuroscience labs
The APA guidelines for ethical conduct of primate research require welfare assessment but leave significant discretion to individual researchers
European regulation has driven greater justification requirements for primate neuroscience research since 2010
Advanced imaging technologies including fMRI and high-density EEG are providing human-relevant alternatives for some primate neuroscience questions

Welfare Considerations

Non-human primate neuroscience research represents the most welfare-intensive category of animal research in most regulatory frameworks, involving surgical procedures, fluid restriction, and months of confinement in laboratory environments for highly social and cognitively complex animals. The scientific value of primate models for understanding human brain function is genuine, but so is the ethical weight of the welfare costs. Fluid restriction protocols, while providing motivation for task performance, are genuinely aversive practices that welfare-conscious alternatives like positive food rewards should replace where feasible. The development of human-relevant non-invasive alternatives is a priority investment for welfare-motivated funders.

What You Can Do

Support the development of human-relevant alternatives to primate neuroscience models
Advocate for positive reinforcement training to replace fluid restriction in primate neuroscience
Engage with neuroscience funding bodies about their primate research replacement commitments
Support stricter regulation of fluid restriction and other aversive primate research methods
Learn about the welfare costs of primate neuroscience research when evaluating research ethical decisions