Gary Drescher's presentation at the 2009 Singularity Summit, "Choice Machines, Causality, and Cooperation," is online, at vimeo. Drescher is the author of Good and Real, which has been recommended many times on LW. I've transcribed his talk, below.

My talk this afternoon is about choice machines: machines such as ourselves that make choices in some reasonable sense of the word. The very notion of mechanical choice strikes many people as a contradiction in terms, and exploring that contradiction and its resolution is central to this talk. As a point of departure, I'll argue that even in a deterministic universe, there's room for choices to occur: we don't need to invoke some sort of free will that makes an exception to the determinism, no do we even need randomness, although a little randomness doesn't hurt. I'm going to argue that regardless of whether our universe is fully deterministic, it's at least deterministic enough that the compatibility of choice and full deterministic has some important ramifications that do apply to our universe. I'll argue that if we carry the compatibility of choice and determinism to its logical conclusions, we obtain some progressively weird corollaries: namely, that it sometimes makes sense to act for the sake of things that our actions cannot change and cannot cause, and that that might even suggest a way to derive an essentially ethical prescription: an explanation for why we sometimes help others even if doing so causes net harm to our own interests.

[1:15]

An important caveat in all this, just to manage expectations a bit, is that the arguments I'll be presenting will be merely intuitive- or counter-intuitive, as the case may be- and not grounded in a precise and formal theory. Instead, I'm going to run some intuition pumps, as Daniel Dennett calls them, to try to persuade you what answers a successful theory would plausibly provide in a few key test cases.

[1:40]

Perhaps the clearest way to illustrate the compatibility of choice and determinism is to construct or at least imagine a virtual world, which superficially resembles our own environment and which embodies intelligent or somewhat intelligent agents. As a computer program, this virtual world is quintessentially determinist: the program specifies the virtual world's initial conditions, and specifies how to calculate everythin...

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