DonGeddis comments on The Absent-Minded Driver - Less Wrong

27 Post author: Wei_Dai 16 September 2009 12:51AM

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Comment author: Tyrrell_McAllister 16 September 2009 10:25:06PM *  5 points [-]

My point is that it's no more convenient than having the pseudo-random number generator available. I maintain that the generator is implementing your memory in functionally the same sense. For example, you are effectively guaranteed not to get the same number twice, just as you are effectively guaranteed not to get the same poker chip twice.

ETA: After all, something in the generator must be keeping track of the passage of the marbles for you. Otherwise the generator would keep producing the same number over and over.

Comment author: DonGeddis 16 September 2009 11:57:33PM 4 points [-]

Rather than using a PRNG (which, as you say, requires memory), you could use a source of actual randomness (e.g. quantum decay). Then you don't really have extra memory with the randomized algorithm, do you?

Comment author: JGWeissman 17 September 2009 12:24:31AM 2 points [-]

I thought of this as well, but it does not really matter because it is the ability to produce the different output in each case event that gives part of the functionality of memory, that is, the ability to distinguish between events. Granted, this is not as effective as deterministically understood memory, where you know in advance which output you get at each event. Essentially, it is memory with the drawback that you don't understand how it works to the extent that you are uncertain how it correlates with what you wanted to remember.