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.
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The word generally used is "ownership". It feels like it is part of you, because the sight of the touch, and the feel of the (separate) touch, are associated in your brain. If someone threatens the rubber hand with a knife, you flinch.https://www.the-scientist.com/infographics/infographic-the-rubber-hand-illusion-31592 …
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It shouldn't be surprising to you know that this illusion starts fading if the two touches become separated by more than 200-300ms. http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0006185 …pic.twitter.com/tM945aFVGV
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And if you're curious, our lab was looking into if this illusion works if you're stimulating the brain directly as well, by passing currents into the sensory cortex in patients with implanted electrodes. (Yes, it does.)http://www.pnas.org/content/114/1/166 …
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Just as
@Foone pointed that the visual system isn't like a camera streaming high-res video back at you, but is full of inconsistencies like blind spots and and selectively high-res (foveal) regions, the same thing is true of the skin on your body.Prikaži ovu nit -
A classic example of "tactile acuity" is 2-point discrimination, whether you can tell that 2 pinpricks are, in fact, from 2 different pins. Well, you might know that this is about a millimeter of acuity in your fingertip, and many centimeters on your torso. That's not bullshit.pic.twitter.com/rvb3HEHaxc
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What is less well known is that this is affected by whether or not those pins touch simultaneously, or one after another. https://onlinelibrary.wiley.com/doi/full/10.1002/ana.24179 … It's also affected by whether or not the pins cause pain. It's even affected by whether you have chronic pain.
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What is probably most bullshit is that tactile resolution is improved by whether or not you're *looking toward* the general direction of the touch. EVEN IF YOU CAN'T SEE ANYTHING BECAUSE YOUR ARM IS IN COMPLETE DARKNESS.https://www.sciencedirect.com/science/article/pii/S096098220100327X …
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(A lot of this background -- and a lot of the ongoing work in neural touch perception at the
@NeuralE_Ctr -- I learn from my colleagues@croninja1 and@djcald. Look for work from them.)Prikaži ovu nit -
(Aside: while your 2-point acuity is ~1 mm, you can feel down to *nanometers* -- if you're allowed to stroke the texture. This is *awesome insane*, not *bullshit insane*. Basically, your brain turns the texture into a symphony of vibrating frequencies. http://www.pnas.org/content/110/42/17107.full …)
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Another way your brain tries to blend vision and feel together is the size-weight and material-weight illusions. Basically, if a larger object weighs the same as a smaller object, the larger (less dense) object also *feels lighter*. As long as you get to look at it first.
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Remember, the two objects weigh the same. And you can lift them the same way - by a handle on a string, say - and the bigger looking one still FEELS lighter.
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Other bullshit insane effects include: - Lighter color feels lighter - More metallic feels lighter - Colder feels heavierhttps://link.springer.com/article/10.1007%2Fs00221-014-3926-9 …
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A lot of this is from how the brain weighs (heh) prior experience. A lot of work has been done in trying to figure out how experience is used - but the short story is that through extensive training you can be tricked into thinking the reverse too, that smaller feels heavier.
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