Wigners Theory
In regards to Wigner's theory, doesn't the fact that the collapse of the wave function being dependent on consciousness, which we can only be sure about in humans, violate the Copernican Principle? Like the fact that it can only be humans who determine the final state of a previously superpositioned state?


Good point.

I'm just as sure about consciousness in dogs and aliens as I am in humans, for many reasons, one of which is the Copernican Principle. If you didn't agree with that then the rest of what you say follows. If you disagreed that dogs and aliens are conscious AND you accepted Wigner's theory then you'd be violating the Copernican Principle twice!



Does that mean that organisms that aren't defined to be conscious would not experience a collapse of the wave function? I had a bit of a google and found scientific definitions of consciousness, all which revolve around 'knowledge, intentionality, introspection and phenomenal experience'. Would this mean that any non-conscious organism (perhaps some limited micro-organism or bacterium) would not experience a wave function collapse, in which case what would they see? Or would they just not experience anything at all (since they are non-conscious)?


I think Wigner restricted it to humans, if I remember correctly, but that's silly in my opinion. The theory should be about consciousnesses. In any case, the last thing you say is right. Non-conscious organisms don't experience anything.