Questions about which animals can suffer, and how much their suffering matters morally, sit at the intersection of philosophy, neuroscience, and ethics. Understanding the state of this debate is crucial for effective animal advocacy.
Sentience philosophy underpins all animal welfare science - without a defensible framework for which animals can suffer and why that matters morally, welfare interventions lack clear targets. The field has moved significantly since Cartesian dismissal of animal minds: neuroscience now provides empirical grounding for what philosophers had argued theoretically. Key unresolved questions include: Does the capacity for suffering vary in morally relevant ways across species? How should we act under uncertainty about invertebrate sentience? Does a creature's subjective perspective matter beyond suffering capacity? These questions directly determine research funding priorities and policy thresholds.