Science can trace every neuron firing when you see red — and still not explain why there is a felt redness at all. This is the rabbit hole where physics runs out of room: zombies indistinguishable from you, a scientist who knows everything about color but has never seen it, and a room that speaks perfect Chinese while understanding nothing.
The philosopher who coined the term lays out why experience itself is the 'hard problem' that neuroscience keeps stepping around.
A rigorous map of the terrain: easy problems versus the hard one, and why reductive explanation seems to hit a wall at subjective experience.
Imagine a being physically identical to you, down to every atom — but with nobody home inside. If that's even conceivable, physicalism has a problem.
Mary knows every physical fact about color from inside a black-and-white room. The day she sees red, does she learn something new?
Frank Jackson's formal case built on Mary's Room — and the surprising twist where its own author later changed his mind.
The Open University's razor-sharp animation of John Searle's argument that shuffling symbols by rulebook is not the same as understanding.
The definitive treatment of Searle's thought experiment and the decades of replies it triggered — newly urgent in the age of large language models.
Neuroscientist Christof Koch presents a bold attempt to turn consciousness into something you can actually measure — a number called phi.