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JoshuaZ comments on Open Thread: July 2010, Part 2 - Less Wrong
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It seems to me that "emergence" has a useful meaning once we recognize the Mind Projection Fallacy:
We say that a system X has emergent behavior if we have heuristics for both a low-level description and a high-level description, but we don't know how to connect one to the other. (Like "confusing", it exists in the map but not the territory.)
This matches the usage: the ideal gas laws aren't "emergent" since we know how to derive them (at a physics level of rigor) from lower-level models; however, intelligence is still "emergent" for us since we're too dumb to find the lower-level patterns in the brain which give rise to patterns like thoughts and awareness, which we have high-level heuristics for.
Thoughts? (If someone's said this before, I apologize for not remembering it.)
The only problem with that seems to be that when people talk about emergent behavior they seem to be more often than not talking about "emergence" as a property of the territory, not a property of the map. So for example, someone says that "AI will require emergent behavior"- that's a claim about the territory. Your definition of emergence seems like a reasonable and potentially useful one but one would need to be careful that the common connotations don't cause confusion.
I agree. But given that outsiders use the term all the time, and given that they can point to a reasonably large cluster of things (which are adequately contained in the definition I offered), it might be more helpful to say that emergence is a statement of a known unknown (in particular, a missing reduction between levels) than to refuse to use the term entirely, which can appear to be ignoring phenomena.