Consciousness substrate

The physical basis of consciousness

I think, therefore I am. I know my own conscious experience directly and can examine it from within. I cannot experience another person's inner life, but our shared human biology gives me reason to believe other people are conscious too.

The premise of this page is that experience depends on a distinct physical basis—the consciousness substrate—that humans connect to, animals may share, and ordinary digital computers do not. The aim is to discover what that basis is and how it makes experience possible.

You’re a living human being, and a computer is just a machine.

On this page's premise, a computer's counterpart is: “I calculate, but I do not experience the result.” Predicting tokens can produce language that sounds conscious; the words alone do not establish an inner experience. The same calculations could, in principle, be performed on paper with the same outputs.

This framework requires more than computation. While other views hold that computation could produce consciousness, the premise here requires a physical connection to the substrate. Ordinary digital computers are assumed to lack that connection; more calculations cannot supply it.

A simulation would change our picture of reality. It would not, by itself, identify the consciousness substrate or explain how experience arises.

We do not know whether the flow of time is fundamental or an illusion. Either way, any physical account of our universe—including a simulation—must reproduce its observed history and arrow of time: we have records of the past, and entropy tends to increase in isolated systems.

Conscious experience is real. What makes it possible? The central question is what the consciousness substrate is and how we are connected to it.