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.
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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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