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Our bodies n brains are so cool. Think about what goes into locating a sound in space.
Edit: there’s more to it but at the most basic level your brain calculates the fraction of a second difference between when one ear picks up a sound and when the other does creating a reference point based on that.
I got into an argument with someone once about this, when they told me (paraphrasing) “it’s safe to drive listening to music through headphones, because they let outside sound in”.
Yes they indeed might, but - even ignoring delay introduced from digital electronics - you’ve now lost all sense of where that sound is coming from, because you’re listening to the sound of one microphone being played through one speaker.
The human ear really is an incredible thing.
Counterpoint: echolocating with footsteps in csgo (entirely a joke, I agree that headphones while driving are unsafe)
Now you’ve got me picturing headphones hooked up to microphones outside of your car. I wonder if that would work well or not.
I have friends who refuse to play with headsets and then wonder why I’m so good at FPS compared to them. I’ve told them multiple times that it is solely the fact that I can locate enemies due to the headphones, yet they refuse to believe me, for some reason.
Put on some halfway decent headphones and try out the virtual barbershop.
I think the “more to it” might be significantly crazier than the timing thing.
Or ears have unique complex shapes that attenuate certain frequencies and bounce sound around in complex ways depending on the direction they ate coming from. And our brains instantly process all that stuff too. It’s why our sense of hearing isn’t just on a flat plane around our head.
And we can also slightly move our ears a tiny amount, but I’m sure even that does increase accuracy.
That’s boring. Two ears only allow you to put the sound somewhere on a plane (the vertical one that cuts your body in half lengthwise). How do you know the ‘height’ of the sound on that plane? By utilizing the different distortions the sound goes through while being funneled through your auricle.
Also, moving your ears and your head.
Also that everyones brain has tuned this perception based on their own ear shape, and if you add prosthetic ridges to someones ear they become very bad at determining the noise source direction in blindfold tests.
In space, no one can hear you scream
Beyond that there’s been a considerable amount of research about our ability to estimate room size/material/shape while blindfolded just based on the reverberation of sounds in the space.
Oversimplified conclusion, untrained humans are really good at it.
You can also detect is the source up or down thanks to ear shape which delays sound for couple of ms.
My hearing is pretty severely damaged in my left ear, and for several months I thought everything was to my right. but my ability to locate sounds has come back. My hearings not any better, my brain just figured out that my left ears fucked and compensated.
The second thing about microslippage is why I, even though I would say I’m transhumanist, would only ever go full cyborg if the robot parts had a sense of touch.
I don’t wanna pet my dog and not only not feel their fur, but also end up crushing them with my super strength.
Also masturbation might be a challenge in that scenario.
Also the ability of mirror neurons to watch someone do a thing, then conceptualize and execute it with your body is extremely interesting.
I’ve seen some pretty awesome prosthetics that are controlled the same way you would use your limbs before they were lost by connecting to nerves; but they still don’t feel anything. At least, not in the sense that the appendage itself is sending signals to your brain for it. There is still phantom sense/pain. You can get a false sense of touch in VR, too.
Agreed, until prosthetics can achieve full parity of both function and sensation then they are only good as replacements for parts that are already missing. No sane person is swapping their hand for one that lacks a sense of touch just as good or better than what they have already, even if it’s mechanically superior. In such a scenario that mechanical superiority is desired they would opt for an augmentation over a prosthetic.
Just earlier today I was googling whether even tooth implants are actually better than the natural alternative.
I didn’t find a definitive answer.
I wonder that as well, I have a false front incisor and haven’t noticed any difference in durability, but as far as sensation goes it’s practically identical, if a bit less sensitive to cold. Then again, the part that actually gets replaced doesn’t exactly have nerve endings, I still have those underneath it.
Yeah when I googled it it was lots of opinions and this is from looking at 20 years of wear on them.
So they’re at least somewhat equal, I would say. Some might argue better. Some would not.
But definitely did make me feel alright about the prospect of having to replace a tooth or several.
I’d take a pettin’ hand and a crushin’ hand.
I think with the beginning stages of this kind of technology would work better with a removable option, for this reason. We are already getting able to make better human appendages, with super strength and dexterity, etc., but the touch is something that will probably be hard to implement for awhile.
A lot of it is less math and more just approximations using old data, just fitting a complex statistical model neural nets suck ass at math
Yeah there is a lot of neural networks, but i don’t think that is the only thing in brain. There could be calculators and integrator circuits
Yeah, your brain is not doing projectile motion equations in real time, it’s the same process as teaching a neutral network to approximate a parabola.
Don’t get me wrong, it’s incredibly impressive that this prediction in our brain requires the visual processing of data from eyes to identify an object flying through the air, moving our hand in a perfect intercept course to catch it. All without having to have a ton of data points to ‘train’ on.
Not advanced maths per se; neural networks are amazing! Fuzzy matching based on experience - taken to an incredible level. And, tuneable by internal simulation (imagination).
Don’t be fooled to think computer neural networks is how the brain is structured. Through out history we’ve always compared the brain to the most advanced technology at the time. From clocks, to computers with short and long term memory, and now to neural networks.
That is a good point, though the architecture of computer neutral networks is inspired by how we think the brain works, and if I understand correctly there is some definite similarity in the architecture.
Lots of difference though, still!
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I would guess that every statement made is kind of true. It is a clock, a computer and a LLM,…
I would even go as far as LLM is the closest to a functioning brain we can produce from a functional perspective. And even the artificial brains are to complex to understand in detail.
I reckon we can get a lot closer than an LLM in time. For one thing, the mind has particular understanding of interim steps whereas, as I understand it, the LLM has no real concept of meaning between the inputs and the output. Some of this interim is, I think, an important part of how we assess truthfulness of generated ideas before we put them into words.
I experimented with rules like : “Summarize everything of our discussion into one text you can use as memory below your answer.” And “summarize and remove unnecessary info from this text, if contradictions occur act curious to solve them”… simply to mimic a short term memory.
It kind of worked better for problem solving but it ate tokens like crazy and the answers took longer and longer. The current GPT4 models seem to do something similar in the background.
I would really like to get into LLM and AI development but the math…woosh right over my head.
I think that’s still different from what I’m thinking of of interim steps, though.
…but as I think how to explain I realize I’m about to blather about things I don’t understand, or at least haven’t had time to think about! So I’d better leave it there!
I was always amazed at how we can catch objects in flight.
Compared to how long it takes me to calculate projectile momentum in Physics 1
Or tiny birds that can expertly navigate wind currents with an almond sized brain using real-time force feedback. The computational power at their disposal is very well optimized for what they do.
And they can even do that in sync with thousands (and even millions) of other small birds.
Hummingbirds are fucking incredible. They can literally hover, fly backwards, fly inverted, fly silently, or flap their wings loud enough to generate sound waves as a mating ritual. They’re like miniature f-18s dog fighting constantly.
Plus they have hollow bones and weigh almost nothing
The overwhelming majority of all neurons in our body are just for controlling movement. Ironically, things like language or creativity require very little of our computing power and might be replicated by machine learning and a sufficiently beefy computer. But complex motor tasks? We’re way ahead of our current tech on that.
We are heading into a great world, where the computers will be doing intellectual and creative stuff, while humans will be doing manual labour.
Yeap, I work in prosthetics and have to explain to “futurologist” on the internet that we’re never going to see advanced prosthetics that are as functional as your original limbs partly for this reason.
Proprioception is important y’all!
When sharpening knives, with practice you can tell when you are done by sliding your fingertips along (not across) the sharpened bevel. It’s possible to feel imperfections measured in micrometers this way.
Worked at a machine shop for a while, it’s funny how the easiest way to gauge surface finish is to run your nail trough it
At one of the places we worked at we would know when the rough cut was deep enough just by feel
If the earth were shrank down to the size of a golf ball, you could feel houses.
That seems wildly unnecessary. I can already feel houses.
I’m sure there’s some actual science thing they’re referencing here, but I don’t understand it. Who can’t feel houses?
People without fingers, I guess
Both a house and a golf ball are unbelievably tiny compared to the size of the Earth. The idea that you can shrink the Earth many thousands of times over and be able to feel a house parallels with our ability to feel micro imperfections on knife blades.
Oh! As in, should you be an outside observer, and grabbing the whole planet, you’d be able to feel houses on its surface if it were the size of a golf ball?
Presumably you’d feel like crushing under your fingers like the hairs on a kiwi lol
It would be a lot more smoother, smoother than a marble. But thoose detection of micro imperfections might be possible
No, you feel a house. Think of how many houses you could feel at once #shrinkearthtoagolfball
We have equipment to measure down to microns, and my students often test how fine details they can feel.
Source??
my half a finger
I mean, most people do it across, rather than along the blade, what with the necessity of detecting a burr, which can’t usually be felt length wise. You slide along the blade, and it is sharp, if you screw up you get cut.
That doesn’t take away from what you’re saying, it’s very true, no matter which direction you’re feeling. Just normal, average fingertips can pick up stuff like that, that you’d need a microscope to see. It’s a trip!
The burr is also detectable lengthwise. When starting with a dull blade it feels smooth while sliding fingers lenghtwise. When the burr is formed, it starts to feel rough. When it feels like it’s digging into skin, it’s sharp. It’s a very subjective thing though, everybody has different fingers.
Is way better to draw your finger perpendicular to the edge to feel the burr. That way you don’t cut yourself on the edge or the burr itself.
This is how I was taught as a kid.
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Another one is levelling.
A lot of people can see a picture frame is about 0.5° out of level and their fucking eye twitches until they fix it
Me included
That’s nuts when you think about it
When my wife was pissed at me she would go to my office before I got to work and tilt every picture/award and move my books about.
She knows what buttons to push and my sous chefs just let her do it… ungrateful pricks
/S
You have multiple sauce cooks and they’re in charge of office security?
…sous
I worked on an industrial robot once, and we parked it such that the middle section of the arm was up above the robot and supposed to be level. I could tell from 50 feet away and a glance that it wasn’t, so we checked. It was off by literally 1 degree.
Degrees are bigger than we think, but also our eyes are incredible instruments.
I purposefully slightly tilt most my wall hangings. I like watching guests squirm when they mention it and I do nothing
We would probably fist fight then, because I’d level it without saying anything, and if you set it back crooked, I would throw it on the ground.
I respect and hate this. I could never
That’s a game that would be hilarious. But yeah, i wouldn’t be able to do it.
Sorry cousin, unfortunately I will get the flu this Christmas and won’t be able to come visit.
Madlad
See, I live in an old apartment. The corners aren’t 90°, the wall a picture is hanging on is convex. When I’m lying in bed and look at the picture it looks like it’s crooked but I used a level several times on it and it’s as straight as can be. It’s driving me insane.
But “level isn’t what you need. If the floor and ceiling aren’t level, it’ll look wrong.
This is when you set it relative to the rest of the unleveled stuff in your view to make it look level.
The tiles in my kitchen were installed slightly rotated so I had to do that with all my shelves
I remember we once installed something on a beam 40’ feet up. While waking through an inspection of many such things, the engineer stops, cocks his head for a second, and says “that’s not quite straight”
And then it wasn’t. Like a cast of manual breathing, the thing I had been frequently walking past for weeks was suddenly wrong, ever so slightly
Leave it up to a civil engineer to ruin your day.
Nah, we just went up and fixed it. I think I did it while the guy on the ground eyeballed it… It’s weird how it’s impossible to see up close, but from 40 feet away humans can tell to a fraction of a percent, I was tapping it with a wrench to dial it in based on the intensity of hand gestures. Honestly, we were more impressed by how he spotted it at a glance, it’s not like we did shoddy work - it was barely not tongue click, as he put it
It helped that I liked the engineer. Always cheerful and he gave me mini multi tool pliers for my birthday. Totally unexpected and not expensive, but I’ve got them right next to me right now, I still use them years later. And he was like that to everyone - he was a stickler for the details, but actually took an interest in us as people
Just a good guy all around. It’s hard to be upset with someone like that, even when they make you redo work now and then
I always thought about how interesting it is that handing things to people is so reliable. We just kind of know exactly when the other person has grabbed something enough for us to let go.
And then there’s the rare moment when you think they have it so you let go and it falls to the floor 😭
If you’re about to walk into a bar with you head, or like the top of a doorpost or smt. You’ll instinctively pull back and avoid the obstacle, inches before it hurts, because your brain notice the hairs on your head moved. That’s why men who have recently gone bald, often have bumps and bruises on their head. My bald colleague told me that for him, that was the hardest thing about going bald.
Maybe I’m understanding wrong but hair don’t have nerves. Is our brain detecting the micro movements of hair follicles inside the skin?
Nerves in the scalp.
So by that logic, a boxer who shaves his head will take harder hits!
Or does that fractional reaction cause the brain to shift forward more than it would if they had not reacted? Could that reaction lead to worse brain injuries? Makes me wonder.
You pull away from the object touching your hair, so I don’t think it would lead to worse injuries. I suppose it could set someone up better using fents and jabs.
Wow super interesting
Thank you hair! I only cut you out of love!
Most people who’ve been juggling for awhile don’t need too much additional practice to be able to do at least a few blindfolded catches just because of how consistent your throws get after awhile.
The other thing that’s interesting is how pattern recognition in flying things people aren’t generally used to seeing develops. I used to play ultimate, and when people start learning how a frisbee flies they might be susceptible to chasing it down by following along the path of the disc rather than moving directly to where it’s going to end up. This is sometimes called dogging the disc because (many) dogs do the same thing. But then you learn to “read” the disc and you can tell by the flight path and angle of the disc where it’s going to land.
Sure, but sometimes Thor just says stuff.
microslippages: some of us just call it what it is … masturbation
I always imagine it more like neural networks. simply based on a lot of training and experience. As an example think of times when you step onto a non moving escalator. Your mind definitely knows its not moving but you still can’t defeat the trained expectation of jerk.
Have you ever swiped on your phone, but the screen doesn’t move (due to end of content, or unknowingly being an unswipable screen), and you feel your eyes jerk automatically in reflex, predicting the movement that didn’t happen?
Layered as well. Little bits process very specific things and simplify it for the beast.
Take shrooms and watch as the divisions between the little bits break down into absolute chaos :D
Acid, too. Dissociatives for the body as well, to some extent.
My brain is like a neural network? No way…
more like neural networks are maybe like your brain? dunno not an expert, just a feeling
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