[light scratching noises] There’s something very unsettling about this. Is it?>>Yeah.
What about this? [wheezing laughter] No? My eyes! We have goggles for a reason! [Brian’s voice echos in the distance]
♪ MODERN ROGUE! ♪ [robot voice]
The modern rogue does some freaky stuff with hands. Jason Murphy,
the other day I said, “Come on.” “Tell me a little bit more about what we’re
doing, while I play piano.” Stop! What?! What’s the big deal? It’s so… it’s kind of creepy. Look, in my heart,
I know that you want to tell me what’s going on. We’re doing the body transfer illusion. Body transfer illusion, what’s the body transfer
illusion? You’re making it both creepy and ridiculous. Huh?
How about this? [sparring noises] Okay. So, the body transfer illusion is where you
make a participant perceive that this is their real hand. Yeah, and there are different schools of thoughts
about this. But basically, for those who believe that consciousness as we experience it, is
an illusion that’s created by different parts of your brain, all of which are not agreeing
with each other, and they manufacture this kind of constant software representation of
reality around you. One way that you can see the Photoshop in
your mind working constantly is, you ever see those floaters go across your vision? Yeah. They’re there all the time, but your brain
is constantly photoshopping them out. You also have a blind spot in the middle of
your vision that you have to work very hard in order to perceive, because again you’re
brain is just constantly like, “That’s not important, write that out.” “Fill it in with what we imagine is there.” Right, it’s how your brain synthesizes all
of the different inputs: touch, and taste, and smell. And in this case, the visual stimulus is overriding
everything else, including the fact that you know that this is not your real hand. Yeah, and we should point out that this is
being used in some therapies. One of the things that happens to people who
have arms amputated, is they have phantom limb itching and pain. That’s where you can feel, like, your hand
hurting even though you lost that hand years ago. And there’s nothing to do about it, there’s
no way to scratch that itch and it’s psychologically, it drives you crazy, right?
>>That sounds nightmarish. Yeah, well and so one of the ways that they’ll
do it, is that they’ll put a mirror there and you’ll put your arm without a hand, but
then they’ll eventually train your brain to perceive that this is your hand, and then
finally you can scratch that itch. You can get some kind of data into your brain
that says, “Hey, uh stop saying it’s itching,” “because look, it’s been scratched.” And the brain’s like, “Oh, okay.
Must be scratched.” You also see this effect prevalent in virtual reality. Oh my gosh. The perception of your body, and it’s even
better now with stuff like the Vive, and the room-scale. You’ve got a lot of experience with this. Oh sure, sure. I’m pretty sure that part of the reason that
you teleport in most VR games is because, I found it very disquieting to press forward
and see my body moving forward and not perceive it. It doesn’t line up with what I’m feeling in
my body. So it wasn’t necessarily technological limitations,
it was a limitation of the human brain. I’m imagining, and I’m sure that that’ll change
over time, but for now, I very much prefer just teleporting spot to spot so it’s just
a flash and now I’m somewhere else and I feel like I’m in that space. As opposed to something where it’s like, let
me move forward and I’m like, “Myeh, this doesn’t feel right.” I’m moving through space, but I don’t feel
any of that. So this is also called the “rubber hand illusion.” It was discovered in Pennsylvania by some
psychologists who were trying to figure out how all of these sensory inputs determined
how you actually perceive your body, and the separation between mind and body. That’s so interesting, because I wouldn’t
have thought that sight would matter so much, but I guess we’re about to find out how much
sight feeds into your perception of who and what you are, right? Yeah, in fact, as we’re going to learn, it
kind of overrides everything else. Really?!
>>Yeah. Okay, all right, so I assume it’s not rocket
science. Walk me through it, what are we doing? Okay, the goal is to trick yourself into believing
that this is your real hand. Okay. Now one of us is going to put our actual hand
in here, and then we’re going to take this jacket, kind of have the illusion… Basically fill in the gaps. Yeah. The more of these trappings
of it being my real arm, will help to encourage me to believe that it is.>>Exactly. Do you want to do it first?
>>Yeah, here I’ll do it. Okay, so—oh wait, don’t do that. A-ha!
>>Yeah, keep your right arm out. Here, let me—>>Put your real hand in here. Okay, all right, all right. Might have to sit down. Yeah, here we go. I look good. Okay, so I assume I want to position my hand pretty
close to where it is right here.>>Right. And then the box will cut off my view of my
actual hand, and so instead I assume you do the same moves to both hands at the same time. Yeah, and what we’re going to do is I have
two different little makeup brushes. You can use paint brushes or anything like
that— Oh my god. I’ve already just experienced it. The moment I looked up at you, and this was
in my peripheral vision, I perceived this as my hand for a split second.
>>As your hand! So it’s already working? And you haven’t even done anything yet.
>>Yeah. Well it’s already like a weird speed bump
that I keep stumbling across, like as long as I’m looking at the cameras over here, and
I see this in the corner, it just feels like that should be my hand. Now what I’m going to do is, I’m going to
take these brushes, we’re going to brush them both simultaneously across your hand in the
same direction at the same time. And on the same spot. And on the same spot, it’s going to be as
synchronized as possible. So I am meant to be looking at this the entire time it happens?
>>Oh yeah. Yeah, that’s key. That’s probably the most important thing. I would imagine a more realistic hand would
make an even better illusion, but… Probably so! They don’t call it the realistic hand illusion,
they call it the—all right, ready. So the coordination is not perfectly synchronized,
but it’s close enough. Yeah, I feel like more variety of where you’re
touching would help. Really? Yeah. I’ll tell you, it works much better when I’m
not looking right at it. Okay. When I see it in my peripheral vision, it
really starts to feel real. Okay, that’s getting weird. It does have a cumulative effect. It does get more and more real over time. Like, for example just then, when I saw the
brush move, I fully expected and anticipated the sensation of touch on a different part
of my hand. So it doesn’t take long to take effect? Yeah! That’s pretty good! Oh, that was weird. Like just then you touched it, and I didn’t
feel it and it was like, I felt numb. Yeah. Like, that is good. Oh wow, it’s happening! It’s happening! Oh my god, it really feels like my hand now! That variety matters a lot. Uh okay, you’ve got to experience this. You’ve got to experience this.
>>Okay. Okay, all right, here we go. All right, you feeling it? I’m going to lean forward. Okay. So that I can’t really see what’s going on. So here, I’m going to be weirdly placed so
that I can make this accurate. Mmk. Oh, yeah.>>Is it starting to happen? I think it’s starting to happen, yeah. [through laughter]
Yeah! On a scale of one to ten, how much of your
own hand do you perceive that as? Like seven.>>JASON: Oh wow, yeah.>>Is it getting better, or?>>It is getting better, yeah.>>All right, tell me when you get to like an
eight or a nine.>>Okay. Everything that I read said it has to be in
the same spot, and it has to be synchronized and et cetera, but you moving it around to different
parts on the hand, that really does make a difference. Yeah, I’m… I’m like at an eight or a nine, it’s uh— Okay, hold on to that. Hold on to that perception.
>>Okay. [uproarious laughter] It’s like, oh my god! You wrecked the hand, too. Did you know I was going to do that? Uh, no. Awesome, okay go for it. What was it like? There was that moment where those two competing
instincts collided. Logically I knew, this is not my hand, but seeing you—
>>But you felt the gut-punch. Yes! There was that moment of,
and not just from the noise or anything, there was that moment of,
“My hand just got ruined.”>>Yeah! And the only thing that saved me,
that yanked me out of it, was that there wasn’t a sudden burst of pain. Wow!
>>Yeah. [Brian laughs]
I’m mean—cause I retracted out of there! Thinking I was controlling this, but there
was that moment when it hit, those two things collided, “This is not your hand,” “this
is totally your hand it’s going to hurt really bad!” Okay, so this is perfect, because I wanted
to do this with you not knowing that I was going to surprise you with it, and I want
to compare it. Should we try it again, and this time you
know it’s coming? And you can tell me if that affects the scenario? Uh, yeah. Let’s do it! Now the hand is damaged, but— Well we’ll see if that even matters. I don’t know that it matters, because it’s
already clearly not my hand looking at it, right? Yeah let’s do it again. Tell me, on a scale of one to ten, Okay. when the illusion takes hold. Yeah, it’s, for me it’s pretty immediate. Try looking over at the camera.
>>Oh, right! Tell me if it’s stronger in your peripheral vision. Oh, definitely. Right? Yeah, that works much more potently,
much more quickly. I’m, yeah, I’m at like an eight right now. It’s good. Okay. All right, are you holding it? Is it staying there? Uh, I think so. [laughter]>>All right, is it still, is it still? I’m not looking directly at it, but yeah.>>So it’s still at an eight? I think so.>>Okay. [whispering]
I wanted to pull away.>>Really?
Yeah. This feels weird. All right, here we go. [startled]
Oh—my god! [wheezing laughter]>>What’s it like? I kept having to remind myself,
“Don’t pull away, don’t pull—” And so I was like,
I was willing myself to stay in place. Wow! Yeah, because every time you brought it down
I was like… [deep inhale] And at first I thought, maybe it was just the
anticipation of the noise and the impact. But no, I kept wanting to— Your body was thinking, “My fingers are in
jeopardy.” It’s like hot stove.>>Yeah. Yeah, yeah. Here, let me try. It might not work the same for you, but it
certainly was effective with me. [nervous wailing]
Whooo! ♪ Ner-vous about this expe-riment. ♪ [Jason laughing] Now give it your peripheral, right? Peripheral vision.
>>Yeah. Okay, all right. So I’m only kind of half-looking. Yeah, it definitely helps to only see it in
your peripheral vision. So it’s like an awareness of it is better
than raw visual, direct input.>>BRIAN: Yeah, and it really is like
a brief period of self-hypnosis, where it’s like you’re training yourself. You’re letting yourself believe it. In fact, you remember, and forgive me for
bringing this up again, when, when you stabbed me in the hand and it messed up my nerves in
my hand, one of the bits of advice is they said, take your hand and just run it around
in a bag full of rice and just be really in-tune with what you’re seeing as you touch. Because essentially your brain is re-wiring
the perception so that it can create this illusion of conscious existence. It’s really, I’m at like a seven or eight
now. Yeah? You ready to try it?
>>Yeah. Yeah I am. Okay, so I’m at an eight.>>Mm-hmm. I perceive that as my hand. Wh-is it this one, or is it this one? You mother—you mm. GAWD DAHMM MIIITT! [laughter] That was jacked up!>>Yeah, right? That is more powerful than I had originally
thought it would be. It kind of freaked me out seeing the finger
get severed. Oh my god, that was a living nightmare. [both laughing] We just gave you PTSD. Yeah, right? Okay, so I guess for everybody at home, it’s
astonishing how quickly it takes root, and how little it takes. Just uh, something to obscure your vision from
your actual hand.>>Yeah. Something to complete the image of the rest
of your body, you know we used a jacket, but I would imagine it would work even better
if you built a jacket such that you cut a slice in there so your arm goes out
>>Oh, sure. and you see your shoulder,
you see, you know fill it with… I don’t know, cotton or something in there,
you know. Yeah, yeah. What if you had this loaded with blood? Oh my god! Yeah, that’d be messed up. Like, that was legit panic for a hot moment. I give this a ten out of ten. Yeah. That is a must-try experience. It’s so easy to do. And if anyone says otherwise, give them one
of these. Give them the finger! The middle—this is the middle finger. Huh? [uncomfortable shudder] Oh, no! No, not a— [Brian laughing] Where did the other finger go?! — CC BY BIZARRE MAGIC —
[branding furnace hissing] [static and wind] [laughter]>>BRIAN: That looks great!>>JASON: Right?>>JASON: The Hand of Brian kind of sounds like a bad
’70s horror movie. [laughter]

100 thoughts on “The Body Transfer Illusion”

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  2. I'm going to have to do some good ol' googling now. I wonder how much this has to do with proprioception. Proprioception has to do with your brain knowing where your body parts are in space. We test this a lot with patients at work when we do a neuro exam. One of the most basic ways is picking up a paw and placing it with the top aspect on the ground. With a normal exam, the patient should pick their foot up and place it back properly. In a dog with CP deficits, their either fail to place the paw back properly at all, or there is a notable delay in the patient placing their paw properly. You see this sometimes too without testing if a patient has ulcers from dragging the front or hind limbs due to some sort of neurological issue (spinal injury, brain lesion, etc). So if proprioception is your brain knowing where your limbs are in space and being able to place them properly based on the different sensory input, it makes me wonder what specifically the experiment effects to make your brain suddenly just throw proprioception out the window and go "fuck bruh, that me hand". Even if the answer is obvious…this is more fun than packing and cleaning.

  3. You need 2 people one tickles the hand until it starts working and keeps going then another person surprises you with the hit

  4. I think you could easily torture people this way if you can lock their real hand and mess with the fake one. That could drive someone crazy without even physically hurting them.

  5. the VR walking issue has been solved they make a treadmill you walk on or a pad you stand on like the old nintendo olympics game where you'd run on the trackpad

  6. There is actually a company making an omnidirectional treadmill so you can walk in vr and feel ultimately immersed and not feel discomfort it's pretty intuitive and interesting I wonder if the company would let you check it out

  7. I did something similar to this in college. We were trying out VR and the makerspace used a simulation of falling off a building.

    For a good moment you feel like you are legit accelerating and a little dizzy.

  8. Brian: Strokes face with mannequin hands

    Jason: There's something unsettling about this.

    Brian: How about this? Seductively suckles mannequin hand

    Cuz, I'm Modern Rooooogue!!

  9. I have seen examples of people who have spent hours doing this with the brush and eventually the real hand stops getting brushed and the person doesn't realize it

  10. The teleporting not moving mainly has to do with motion sickness, I would probably throw up in I was walking forward in a VR game and even 80fps

  11. 1:29 Thank you, Brian and Jason, you just helped me confirm my left eye is my dominant eye because i couldnt hold focus long enough to test this with my right eye

  12. With VR there's been this phenomenon recently called phantom sense where if someone say, touches your head or your nose (the most common one) in VR you start to sense like you are being touched irl. There's also that one time where I had to go through the morning slowly because my first instinct is to grab things like how I grab things in-game or walk in seated play and push on a joystick. Its weird but you get used to it.

  13. Close your eyes and listen while they brush eachothers hands. Tell me it doesn't sound like they're sexually experimenting.

  14. maybe the shock of it would be greater if the hand had like red food dye in it to simulate blood or something because you realize it's not your han- oh shit there's blood.

  15. This video brings me back to the movie "Dune" FEAR IS THE MIND KILLER…. LOL, where Paul's hand is placed in the box!!

  16. I would love to try this on myself actually. I am a mechanic, machnist and a really avid gamer so my perception of where my hands are is not based on that I see where my hand is but mostly on muscle memory and routine.

  17. I absolutely love this channel. It's so entertaining. I don't know why you guys don't already have 10 million subscribers.

  18. I feel as if this is similar as someone that has a visible tattoo that they can see at all times and your brain ends up thinking oh that’s been there forever. Like I have a quarter sleeve tattoo on my left forearm and there’s times where I don’t even notice that I have it cause I just think oh yeah that’s always been there and it’s weird cause I’ll forget I have it

  19. I'm glad that guy figured out what his neighbor had in the window. I typed in the name and ordered one! Thank you buddy!

  20. It's absolutely crazy how fast our brains can be tricked. Our minds are more than willing to convince us of stuff, no matter how ridiculous it might be.

  21. “I have 2 different little makeup brushes . . .”

    ? . . . Why do you have 2 different little makeup brushes?? . . . ? What are you guys doing off camera? ?

    “Did you know I was gonna do that?”

    “Uh, no!”

    ? But Didn’t you suspect he would do something like that?

  22. The taller guy has a lovely voice. Like, it randomly transitions into radio announcer and I love it.

  23. Yeah mirror therapy has some good results in phantom limb pain. As someone who lost both legs, it doesn’t help me at all.??

  24. Another example of our brain constantly adjusting what we see is that, with only one lens in our eye, we see everything upside-down.

  25. regarding VR, people have found out that with increased exposure, you can gain your VR-legs, like sea-legs, and the nausea and weirdness fades as the brain adapts to compensate for and control the VR body and its movement. kind of how riding a bike is wobbly at the start, or how you can flip your vision upside down and adapt to that.

  26. I tried this with a clay cans with my friend and I put fake blood in the hand and he didn’t know I was going to chop that fake am hand and he literally almost passed out

  27. Anyone can do this and trick their brain. That hand is not your hand, the logical section of your brain understands this, the rest of your brain does not agree. Dysphoria really sucks btw.

  28. i think this is why when we feel pain in a dream we wake up, we cant feel the pain so we become aware that we are not experiencing our own body and that pulls us back to reality and we wake up

  29. As often as knives are played with I was really expecting a surprise fake hand stabbing but dismemberment is good too.

  30. I sleep on my stomach and sometimes before I got to sleep, I'll have my hands above my head but below the pillow. Often I'll have my hands clasped together and sometimes when I move one if my hands, on the other hand, it feels like someone else is holding my hand. It's really weird and cool at the same time.

  31. I have almost that feeling when playing video games if you ask me what the controls are I couldn't tell you. If I want to walk forward I just walk forward not push forward on the analog stick. I feel like I'm controlling the character and am dimly aware of the controller in my hand.

  32. Do you remember when you where a little kid and somebody tickled you untill you couldn't take it anymore and then that somebody backed off and started the tickling motion in mid air and you still could experience the feelings of being tickled?

    Yep… it is easy to fool the brain…

    Cross your fingers and close your eyes and rub your crossed fingers up and down your nose…

  33. i can envision you some better experience
    about body transfer sit i a bus or a park and envision the whole space with every thing . now close your eyes and flout with your mind trough the room your in. look trough everyones eyes

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