AI consciousness debate: Why a Cambridge philosopher says we may never know
A University of Cambridge philosopher, Dr Tom McClelland, argues that we may never be able to tell whether an AI system is truly conscious, because we still lack a solid explanation of what consciousness is, and no reliable “consciousness test” appears close.
If an AI one day claims it feels pain, love, or fear, how would anyone prove it is more than performance?
That question moved from sci-fi talk to academic urgency on December 18, 2025, when Cambridge philosopher Dr Tom McClelland published an argument that the evidence we rely on to judge consciousness is too thin to settle the AI case.
The tension is straightforward and acute: while AI is improving its ability to behave like a mind, our methods for identifying a mind have not kept up.
This piece explains what McClelland is actually claiming, why both the “yes, AI can be conscious” and “no, it can’t” camps may be overconfident, and what practical decisions are being shaped right now by uncertainty.
The bottleneck most people skip is not computing power. It is epistemology: what counts as evidence of inner experience when the system can imitate the outward signs?
The story turns on whether we can build a test that separates genuine experience from flawless mimicry.