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Tyrrell_McAllister comments on What Are Probabilities, Anyway? - Less Wrong
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You care equally for your selves that see heads and your selves that see tails. If you don't care what happens to you after you see heads, then you would assign probability one to tails. Of course, you'd be wrong in about half the worlds, but hey, no skin off your nose. You're the one who sees tails. Those other guys ... they don't matter.
Thanks. That makes it a lot clearer.
It seems like this "caring" could be analyzed a lot more, though. For example, suppose I were an altruist who continued to care about the "heads" worlds even after I learned that I'm not in them. Wouldn't I still assign probability ~1 to the proposition that the coin came up tails in my own world? What does that probability assignment of ~1 mean in that case?
I suppose the idea is that a probability captures not only how much I care about a world, but also how much I think that I can influence that world by acting on my values.
See http://lesswrong.com/lw/15m/towards_a_new_decision_theory/ for more details. Many of my later posts can be considered explanations/justifications for the "design choices" I made in that post.