> But what exotic non-quantal stuff do you think the consciousness-mediating
The Turing machine is made out of normal stuff, it's the computer sitting in front of you. Its the interaction of the machine with the environment that affects the time line. The quantas making up the fabric of the universe are computing under constraints. There are overarching constraints existing before the big bang, the constraints added moments after, and there are recent, temporary, highly localized constraints such as the restriction of gun threads on this mailing list. The quanta compute many potentials, but to keep dogs from turning into cats and cups from unsmashing certain constraints interact with quanta to maintain the reality we know.
A Turing machine has a rigid phase space because it has a finite internal state space and a finite input space. This doesn't change unless some one rewires the machine. Anyways, you guys have worn me out so I've changed the color of my sound and won't be able to respond for a while.