Mind and body · Quiz question 14/35
The Philosophical Zombie (Conceivability Argument)
Can you imagine a being identical to you down to the atom, but with nothing going on inside? David Chalmers's zombie argument and the replies.
Imagine a being identical to you — looks, words, actions, down to every atom in its brain. But inside, it feels nothing. It says "ouch" but feels no pain, laughs but feels no joy. Philosophers call this a "philosophical zombie".
The idea of such a being at least makes sense.
The first systematic use of "zombies" for this problem was British philosopher Robert Kirk's 1974 paper "Zombies v. Materialists." David Chalmers made it central to the modern consciousness debate in The Conscious Mind (1996) with his "conceivability argument": if zombies are conceivable, they're metaphysically possible; if so, consciousness is something over and above the physical facts, and physicalism is false.
This question only asks about step one: is it conceivable? If you agreed, you think consciousness doesn't follow logically from physical structure. The key intuition: once you know water's molecular structure you can't imagine "but what if it isn't water?" — yet knowing everything about a brain, "but what if there's no feeling?" still seems imaginable.
Physicalists have two main replies. Dennett said we can't properly imagine zombies — we only think we can. Kirk himself later changed his mind and argued zombies are ultimately incoherent. Other physicalists say zombies are conceivable but not actually possible: just as you can imagine water not being H₂O even though it's impossible, conceivability doesn't prove possibility.
If zombies are possible, consciousness is an extra fact beyond the physical.
Key names: David Chalmers, Thomas Nagel (sympathetic), Descartes (forerunner)Imaginable doesn't mean possible. Consciousness = brain state is a necessary truth discovered empirically.
Key names: Brian Loar, Christopher Hill, Joseph Levine (explanatory gap)Imagine them properly and you hit a contradiction. A zombie would also say "I feel things" — so what is that talk about?
Key names: Daniel Dennett, Paul Churchland, later KirkIn the 2020 PhilPapers Survey, about 24% of philosophers said zombies are metaphysically possible.