Is consciousness fundamental? Physicists split on mind and matter
September 29, 2026 · 19 min read
Thomas Campbell argues consciousness is the base of a virtual reality, Adam Frank says science has a blind spot about experience, while Sean Carroll and Sara Walker offer views rooted in emergence and information. Seeing the range of positions clarifies one of the deepest open questions in science.
The rules, numbers and steps worth keeping in front of you.
- Four positions: Thomas Campbell mind-first, Sean Carroll and Sara Walker matter-first, Adam Frank experience-first.
- Campbell: consciousness computes the physical universe as a virtual reality; the body is an avatar.
- Campbell defines consciousness as an awareness with a choice.
- Campbell's evidence is largely first-person, and his larger experiments are still under way; treat his claims as proposals.
- Frank: lived experience is the precondition of science, and science wrote it out of its picture.
- Frank's temperature parable: science abstracted from felt hot and cold, then forgot the starting point.
- Frank: the third-person view is a useful fiction, fine for billiard balls but not for the deepest questions.
- Carroll: consciousness is real, like a table, and is a way of talking about atoms and neurons.
- Carroll's filter: a theory of mind that requires new laws of physics needs evidence to match.
- Carroll: an illusion is something you think you perceive that is not there; consciousness is not that.
- Walker: our concept of matter is incomplete; we cannot yet think about information in a material way.
- Walker: computation is our best current language, not the base of reality.
- Walker: questions about AI consciousness stay in a gray area until there is a testable theory.
- All four resist calling experience an illusion; none claims to have solved consciousness.
This is the short form. The full insight has every expert's reasoning, their own words and the sources.