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- November 2022Since I was about 9 I've been puzzled by the apparent contradiction
- between being made of matter that behaves in a predictable way, and
- the feeling that I could choose to do whatever I wanted. At the
- time I had a self-interested motive for exploring the question. At
- that age (like most succeeding ages) I was always in trouble with
- the authorities, and it seemed to me that there might possibly be
- some way to get out of trouble by arguing that I wasn't responsible
- for my actions. I gradually lost hope of that, but the puzzle
- remained: How do you reconcile being a machine made of matter with
- the feeling that you're free to choose what you do?
- [1]The best way to explain the answer may be to start with a slightly
- wrong version, and then fix it. The wrong version is: You can do
- what you want, but you can't want what you want. Yes, you can control
- what you do, but you'll do what you want, and you can't control
- that.The reason this is mistaken is that people do sometimes change what
- they want. People who don't want to want something — drug addicts,
- for example — can sometimes make themselves stop wanting it. And
- people who want to want something — who want to like classical
- music, or broccoli — sometimes succeed.So we modify our initial statement: You can do what you want, but
- you can't want to want what you want.That's still not quite true. It's possible to change what you want
- to want. I can imagine someone saying "I decided to stop wanting
- to like classical music." But we're getting closer to the truth.
- It's rare for people to change what they want to want, and the more
- "want to"s we add, the rarer it gets.We can get arbitrarily close to a true statement by adding more "want
- to"s in much the same way we can get arbitrarily close to 1 by adding
- more 9s to a string of 9s following a decimal point. In practice
- three or four "want to"s must surely be enough. It's hard even to
- envision what it would mean to change what you want to want to want
- to want, let alone actually do it.So one way to express the correct answer is to use a regular
- expression. You can do what you want, but there's some statement
- of the form "you can't (want to)* want what you want" that's true.
- Ultimately you get back to a want that you don't control.
- [2]
- Notes[1]
- I didn't know when I was 9 that matter might behave randomly,
- but I don't think it affects the problem much. Randomness destroys
- the ghost in the machine as effectively as determinism.[2]
- If you don't like using an expression, you can make the same
- point using higher-order desires: There is some n such that you
- don't control your nth-order desires.
- Thanks to Trevor Blackwell,
- Jessica Livingston, Robert Morris, and
- Michael Nielsen for reading drafts of this.
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