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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. James Wu‏ @analogist_net Jul 3

      James Wu Retweeted foone

      In honor of @Foone's thread on the *visual* quirks of our brains, let's talk about "how bullshit insane our brains are": sensory and motor systems edition.https://twitter.com/Foone/status/1014267515696922624 …

      James Wu added,

      foone @Foone
      You want to know something about how bullshit insane our brains are? OK, so there's a physical problem with our eyes: We move them in short fast bursts called "saccades", right? very quick, synchronized movements. The only problem is: they go all blurry and useless during this
      Show this thread
      9 replies 626 retweets 1,106 likes
      Show this thread
    2. James Wu‏ @analogist_net Jul 3

      Just like with the visual system, "hack your time perception" is trick is one that our brains employ a whole lot, to try make actions *appear* as if they're happening at the same time. This probably makes cause-and-effect easier to associate.

      1 reply 29 retweets 97 likes
      Show this thread
    3. James Wu‏ @analogist_net Jul 3

      For example, try scratching your leg. You can feel your hand move; you can feel force in your fingers. You can feel your nail on your skin. Feels like they're all happening at about the same time, right? Wrong.

      2 replies 5 retweets 52 likes
      Show this thread
    4. James Wu‏ @analogist_net Jul 3

      Your motor commands zips down from your brain through α-motor neurons to your fingers at around 100 m/s. They move; your legs then feel that scratch slowly at 40 m/s through type II sensory fibers. That signal's roundtrip takes 40-50 ms to just travel through your body.

      1 reply 3 retweets 66 likes
      Show this thread
    5. James Wu‏ @analogist_net Jul 3

      After the sensory signals process, 100-200 ms has passed - from intent to conscious sensation. For reference, that would be the network roundtrip time from the US west coast, all the way to Europe, *and back*.

      2 replies 7 retweets 70 likes
      Show this thread
    6. James Wu‏ @analogist_net Jul 3

      Crazy thing is, if that happened in a game you're playing, you would complain about lag. But for scratching, you *don't feel it at all* - your brain hacked time perception backwards to make you think the movement intent, the movement, and the sensation occurred at the same time.

      3 replies 11 retweets 105 likes
      Show this thread
    7. James Wu‏ @analogist_net Jul 3

      This "hack sensations back in time" trick is also related to another effect - cancelling the sensations of your own actions. In movement neuroscience (and controls), this is the "efference copy". You expect the movement to feel a certain way, then you subtract that expectation.

      1 reply 5 retweets 62 likes
      Show this thread
    8. James Wu‏ @analogist_net Jul 3

      Subtracting the expected sensation from the actual one -- that is, paying attention to what *wasn't* unexpected -- is a great strategy for a lot of reasons, chief among them being that the brain doesn't have to waste as much energy paying attention when things are *going right*.

      1 reply 5 retweets 60 likes
      Show this thread
    9. James Wu‏ @analogist_net Jul 3

      Most people can't tickle themselves. Even using a tool, like a pen, it's very hard. Ever wondered why? One of the dominant reasons is that our movement efference copy is being canceled out, muting the feeling. But! That cancellation only works within about 150-200 milliseconds.

      1 reply 15 retweets 89 likes
      Show this thread
    10. James Wu‏ @analogist_net Jul 3

      In a famous experiment in 1999, Dan Wolpert's lab built a robot. You moved the robot's arm, and another arm mirrored your movements, after an adjustable short delay. You could now in fact tickle yourself - as long as the robot copying your movements was delayed by about 200 ms.pic.twitter.com/u5d9gQc19n

      Tickling sensations using a robot that copied your movements is about the same as if someone else tickled you, after a 200ms delay.
      2 replies 27 retweets 147 likes
      Show this thread
      Rich Felker‏ @RichFelker Jul 4
      Replying to @analogist_net

      I get the feeling there's a certain industry you could patent & sell this concept to and become a billionaire.

      1:47 PM - 4 Jul 2018
      • 1 Like
      • James Wu
      1 reply 0 retweets 1 like
        1. James Wu‏ @analogist_net Jul 4
          Replying to @RichFelker

          Let’s just say... that the prosthetics industry has long understood that comfortable coupling with skin with minimal effects is an extremely difficult problem. So that needs to be solved first.

          0 replies 0 retweets 0 likes
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