Not replying to the comment thread: I think the quote might actually be Deuteronomy 13:6-10 in the King James Version.

Oh, that's subtle.

Check me if I'm wrong: according to the MWI, the evolving waveform itself can include instantiations of human beings, just as an evolving Conway's Life grid can include gliders. Thus, if we're proposing that humans exist (a reasonable hypothesis), they exist in the waveform, and if the Bohmian particles do not influence the evolution of the waveform, they exist in the waveform the same way whether or not Bohm's particles are there. And, in fact, if they do not influence the amplitude distribution, they're epiphenomenal in the same sense that people like Chalmers claim consciousness is.

If the particles do influence the evolution of the amplitude distribution, everything changes (of course). But that remains to be shown.

Having quantum collapses IS having Many Worlds... unless and until you can demonstrate that the two are different in some way.

...

I do not believe that word means what you think it means.

03:16 was me - curse you, Typepad!

Correct me if I am wrong, but MWI does have noticeable consequences, or at least implications: for example, interference at all length-scales and proper evaluation of the waveform equations implying the Born probabilities. Neither of these are implicit in the Copenhagen interpretation - in fact, the first is contradicted.

...wait, the collapse postulate doesn't suggest different results? In order for collapse to occur, the amplitude-summing effect we see at the level of particles would have to vanish at some point. Which implies that above that point, "interference" effects will vanish.

We might have a hard time running the experiment, but that sounds like a different result to me.

Unknown, I don't think Egan's Law has anything to do with facing reality. If I read it correctly, Egan is saying that any theory (e.g. quantum mechanics, general relativity, the standard model) ought to predict normal events on the level of normal events. If relativity predicted that a ball dropped from a height of 4.9 meters would take 5.3 seconds to hit the ground, relativity would be disproven. It all must add up to normality.

Robin Z: The motivation for suspecting that something funny happens as you try scale up decoherance to full blown many-worlds comes from the serious problems that many-worlds has. Beyond the issue with predicting the Born postulate, there are serious conceptual problems with defining individual worlds, even emergently.

Enough said - I withdraw my implied objection. I, too, hope the experiment you refer to will provide new insight.

Is there any reason to believe that something interferes with the physics between "microscopic decoherence" and "macroscopic decoherence" that affects the latter and not the former? I'm just saying because I'm getting strong echoes of the "microevolution vs. macroevolution" misconception - in both cases, people seem to be rejecting the obvious extension of a hypothesis to the human level.