Comparison
Panpsychism vs Idealism
Panpsychism and idealism both reject the materialist claim that consciousness arises from wholly nonconscious matter. They disagree about what to put in its place. Panpsychists such as Philip Goff, Galen Strawson and David Chalmers keep the physical world and give it an inner nature. Following Bertrand Russell, they note that physics describes what particles and fields do and says nothing about what they are in themselves. That intrinsic nature, they propose, is experience or something close to it.
Idealists go further. In Bernardo Kastrup’s analytic idealism there is one universal consciousness, and the physical world is how its activity looks from outside. Individual minds are dissociated parts of it, much as alters form in dissociative identity disorder. Matter is real as appearance, with nothing beneath it that is not mind.
Goff and Kastrup have debated the question in public several times, and their exchanges show where the views split. Kastrup presses the combination problem. If every particle has its own tiny experience, nobody has explained how billions of them add up to one unified human subject. Goff replies that idealism faces the same puzzle run backwards, the decomposition problem of how one cosmic mind splits into many private ones, and that it must also explain why mind behaves with the lawful regularity physics describes. Each side holds that its own problem is the easier one to solve.
The choice reaches beyond metaphysics. The two views give different answers on whether machines could be conscious and whether anything of a person survives death, and the stances below show where individual theories land.
Common ground. Both treat consciousness as fundamental, and both cite the hard problem as their main reason for rejecting materialism. Both accept the findings of physics and neuroscience and reinterpret what those findings describe. Each faces a mirror-image unity problem, combining small minds into one or dividing one mind into many.
Key differences
| Panpsychism | Idealism | |
|---|---|---|
| What is fundamental | Physical entities whose intrinsic nature is experiential or proto-experiential. Matter is real and has an inner side. | Consciousness alone. The physical world is how mental activity appears from outside, or exists only within mind. |
| Where individual minds come from | Simple micro-experiences combine into human and animal minds, by a process no one has yet explained. | One universal consciousness divides into many. Kastrup calls individual minds dissociated alters of it. |
| Relation to physics | Keeps physics as it is and supplies the intrinsic nature its structural descriptions leave out, following Russell. | Treats physics as a description of regularities within experience, with nothing outside mind for it to describe. |
| Main objection | The combination problem. Nobody has shown how tiny subjects add up to one unified mind. | The decomposition problem. Idealists must explain how one mind splits into many and why the shared world is so lawful. |
| AI consciousness | Open. AI hardware has the same basic ingredients as a brain, and whether they form a subject depends on the combination problem. | Kastrup calls conscious AI a fantasy, since computation alone does not make a dissociated center of experience. |
On the big questions
| Panpsychism | Idealism | |
|---|---|---|
| AI consciousness | Yes or likely 8 Possible or depends 6 Uncertain 3 | Yes or likely 5 Possible or depends 5 Uncertain 7 Unlikely or no 9 |
| Life after death | Yes or likely 2 Possible or depends 3 Uncertain 1 Unlikely or no 9 | Yes or likely 26 Possible or depends 1 Uncertain 4 Unlikely or no 1 |
| Mind uploading | Yes or likely 7 Possible or depends 3 Uncertain 2 Unlikely or no 1 | Yes or likely 5 Possible or depends 1 Uncertain 1 Unlikely or no 13 Not needed (consciousness persists anyway) 3 |
| Meaning and purpose | Cosmic or ultimate 4 Uncertain 9 | Cosmic or ultimate 35 Humanistic only 3 Uncertain 2 |
Panpsychism
Consciousness is a basic feature of the physical world. The fundamental particles and fields of physics have experiential, or proto-experiential, properties, and in brains these combine into the full awareness of a human or animal.
Idealism
Consciousness is the fundamental reality. Mind or awareness comes first, and the physical world, including brains, is derived from consciousness, exists within it, or is an illusion.