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evantthompson's profile
Evan Thompson
Evan Thompson
Evan Thompson
@evantthompson

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Evan Thompson

@evantthompson

Writer, UBC Philosophy, Assoc Member Asian Studies & Psych Depts. Married to @beckettodd

Vancouver
evanthompson.me
Joined January 2015

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    1. Mel Andrews 𓃻‏ @bayesianboy May 12
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      Mel Andrews 𓃻 Retweeted David L Barack

      Bad.https://twitter.com/DLBarack/status/1260313994390355970 …

      Mel Andrews 𓃻 added,

      David L Barack @DLBarack
      5E cognition = embedded, embodied, enactive, externalist, and ergodic cognition
      Show this thread
      5 replies 0 retweets 18 likes
    2. Evan Thompson‏ @evantthompson May 12
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      Replying to @bayesianboy

      First 4 good, last one, not so much.

      1 reply 0 retweets 4 likes
    3. Mel Andrews 𓃻‏ @bayesianboy May 12
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      Replying to @evantthompson

      Yes. Under the FEP it is a meaningless artefact of a certain class of formalism.

      2 replies 0 retweets 7 likes
    4. Evan Thompson‏ @evantthompson May 12
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      Replying to @bayesianboy

      Music to my ears. This is what I've long suspected.

      1 reply 0 retweets 4 likes
    5. Mel Andrews 𓃻‏ @bayesianboy May 12
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      Replying to @evantthompson

      Trying to clear this up in a paper I’m currently drafting. The ergodicity assumption isn’t even a problem, in and of itself, over and above the limitations of representing organismal dynamics within a finite state space.

      1 reply 0 retweets 9 likes
    6. Nathaniel Virgo‏ @NathanielVirgo May 13
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      Replying to @bayesianboy @evantthompson

      You can be finite and still not be ergodic - this reversible cellular automaton, for example, is ergodic but probably only on time scales comparable to the lifetime of the universe.pic.twitter.com/qQmSKfBFPz

      1 reply 0 retweets 2 likes
    7. Nathaniel Virgo‏ @NathanielVirgo May 13
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      Replying to @NathanielVirgo @bayesianboy @evantthompson

      An ergodic assumption means basically "compared to the time scales of the dynamics, the state space is small enough that the system will always revisit more-or-less the same state many times." You don't need an infinite state space for that to be violated.

      1 reply 0 retweets 2 likes
    8. Nathaniel Virgo‏ @NathanielVirgo May 13
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      Replying to @NathanielVirgo @bayesianboy @evantthompson

      (just in case it's not obvious, I agree with your points here, I'm just expanding on them slightly.)

      1 reply 0 retweets 1 like
    9. Mel Andrews 𓃻‏ @bayesianboy May 13
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      Replying to @NathanielVirgo @evantthompson

      Of course. The point is that the ergodicity assumptions under the FEP present a disanalogy with life. Many have pointed this out. What I think many have failed to grasp is that this presents no issue over and above the issue of representing life in a finite state space.

      1 reply 0 retweets 2 likes
    10. Mel Andrews 𓃻‏ @bayesianboy May 13
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      Replying to @bayesianboy @NathanielVirgo @evantthompson

      The FEP represents a ‘slice of life,’ so to speak, and at a high degree of abstraction, at that. For its purposes, the ergodicity assumption is a fairly standard idealisation and unproblematic.

      2 replies 0 retweets 1 like
      Evan Thompson‏ @evantthompson May 13
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      Replying to @bayesianboy @NathanielVirgo

      I think it's standard and problematic.

      7:50 AM - 13 May 2020
      • 3 Likes
      • Nathaniel Virgo Frank Zappatista Mel Andrews 𓃻
      1 reply 0 retweets 3 likes
        1. New conversation
        2. Mel Andrews 𓃻‏ @bayesianboy May 13
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          Replying to @evantthompson @NathanielVirgo

          Over and above the high degree of abstraction and the short timescales?

          1 reply 0 retweets 0 likes
        3. Evan Thompson‏ @evantthompson May 13
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          Replying to @bayesianboy @NathanielVirgo

          Life fundamentally involves organizational change (horizontal gene transfer, antiobiotic resistance, learning a language, learning to dance, healing from trauma). I don't see how any of this can be understood under the ergodicity assumption.

          1 reply 0 retweets 3 likes
        4. 7 more replies

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