want.txt 2.7 KB

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  1. November 2022Since I was about 9 I've been puzzled by the apparent contradiction
  2. between being made of matter that behaves in a predictable way, and
  3. the feeling that I could choose to do whatever I wanted. At the
  4. time I had a self-interested motive for exploring the question. At
  5. that age (like most succeeding ages) I was always in trouble with
  6. the authorities, and it seemed to me that there might possibly be
  7. some way to get out of trouble by arguing that I wasn't responsible
  8. for my actions. I gradually lost hope of that, but the puzzle
  9. remained: How do you reconcile being a machine made of matter with
  10. the feeling that you're free to choose what you do?
  11. [1]The best way to explain the answer may be to start with a slightly
  12. wrong version, and then fix it. The wrong version is: You can do
  13. what you want, but you can't want what you want. Yes, you can control
  14. what you do, but you'll do what you want, and you can't control
  15. that.The reason this is mistaken is that people do sometimes change what
  16. they want. People who don't want to want something — drug addicts,
  17. for example — can sometimes make themselves stop wanting it. And
  18. people who want to want something — who want to like classical
  19. music, or broccoli — sometimes succeed.So we modify our initial statement: You can do what you want, but
  20. you can't want to want what you want.That's still not quite true. It's possible to change what you want
  21. to want. I can imagine someone saying "I decided to stop wanting
  22. to like classical music." But we're getting closer to the truth.
  23. It's rare for people to change what they want to want, and the more
  24. "want to"s we add, the rarer it gets.We can get arbitrarily close to a true statement by adding more "want
  25. to"s in much the same way we can get arbitrarily close to 1 by adding
  26. more 9s to a string of 9s following a decimal point. In practice
  27. three or four "want to"s must surely be enough. It's hard even to
  28. envision what it would mean to change what you want to want to want
  29. to want, let alone actually do it.So one way to express the correct answer is to use a regular
  30. expression. You can do what you want, but there's some statement
  31. of the form "you can't (want to)* want what you want" that's true.
  32. Ultimately you get back to a want that you don't control.
  33. [2]
  34. Notes[1]
  35. I didn't know when I was 9 that matter might behave randomly,
  36. but I don't think it affects the problem much. Randomness destroys
  37. the ghost in the machine as effectively as determinism.[2]
  38. If you don't like using an expression, you can make the same
  39. point using higher-order desires: There is some n such that you
  40. don't control your nth-order desires.
  41. Thanks to Trevor Blackwell,
  42. Jessica Livingston, Robert Morris, and
  43. Michael Nielsen for reading drafts of this.