Imagine having this operation, and upon waking up you find you can't talk. You can't control your body, and some other person claiming to be you is doing all the talking and moving. You are struggling to to communicate, to let everyone know that you exist. Eventually you manage to get control of one of your hands ...
This is what I was thinking when he said sometimes the left hand tries to choke the person. Maybe that side of the brain is in crisis because it can’t communicate.
This is crazy!! My son is getting this procedure done tomorrow morning. I literally just sat down after checking in to the hotel and this video pops up. It’s actually his second time with this procedure. We opted for laser ablation last September and two small areas had enough missed to make a reconnection. If everyone could say a little prayer tonight we’d appreciate it.
Glad they all lived my fiance died by being hit by a drunk driver. She seemed okay then went into a coma and died. She died by visiting me. (I am using an other account and writing)
Alien hand syndrome really is fascinating. Brains are fascinating in general. Neuroscience is an amazing thing. What we know about the brain is still far outweighed by what we don’t.
Brains sure are amazing, a perfect example of the uncertainty theory. Which is why clones would never be the same person, it's impossible for their brains to grow the same way
The bit about the hand attacking the person rather says to me that the brain is acting out in frustration because they can't communicate with its other half.
Not really, we know an awful lot about the functional processes of the brain. The problem is, neurology is the study of the nervous system, which can be viewed in terms of behavior, function, organization, physiology, and anatomy. None of these contexts can explain the whole by itself. And the failure of the human connectome project illustrates the difficulty of trying to study one aspect in isolation.
@@jamesmeppler6375 what we consider a person is a theory of mind, which is a function of an interplay between our brains and out bodies. This is why the concept of transhumanism is completely unrealistic. That said, I would encourage you to read up on the Minnesota twin study - both the findings and the criticism. There were twins who weren't raised in the same household that exhibited nearly identical personality traits and behaviors. It raises a lot of questions.
Here is something interesting: Sometimes when I'm feeling agitated, bored, or just generally upset, if I choose to do a task with my left hand, the sensation goes away. I've learned this is sort of my right brain asking to be acknowledged, almost as another personality. I first noticed this while driving long distances. Apparently, my right hemisphere enjoys driving, and being given other tasks (including typing). Btw, while I'm slightly left-hemisphere dominant, using my right hand more often, I am very ambidextrous. I can write, shave, brush my teeth/hair, sweep/rake, and stir things with both hands, and in fact, for some tasks, I don't know which is the "right" way to do a task. My dad "caught" me sweeping and raking the "wrong" way a few times, and tried to force me to do it from only one side. This felt extremely awkward, being unable to switch sides depending on which was needed to do the task more efficiently, as well as feeling punishing, as if a part of me was being punished for simply showing it existed. He also refused to allow me to practice writing or batting left-handed. I've also witnessed various people noticing, and being surprised and somehow disconcerted by seeing people on t.v. doing something left-handed, such as stirring in a bowl. I would love to participate in brain scan studies, to understand better who I am in total. We might discover brain lateralisation to be a factor in depression, and that giving a depressed person bilateral or left-handed tasks to practice might be part of effective treatment.
Very interesting. I am an engineer. When I get stuck on a problem, at some point, I just need to do something else. Exercise can help, but something like drawing, painting or playing guitar works better. At some point, the answer just pops into my head as if my subconscious kept working on the problem the whole time while the conscious was busy with something else, rather than obstinately standing in the way of a non-standard solution. I've learned when it's time to do something else. Also, I am right handed, and regularly played a right handed opponent. He was having back problems and decided to play left handed to balance out the muscles in his back. I switched to my left hand to keep a level playing field. I was surprised to discover playing left handed improved my right hand game!
@@Incandescentiron I love this. You're into something. Try ping pong. I switch hands, and am equally good either handed, but my best is when I keep switching during play. I hypothesise that intentionally using both sides makes our whole brain work better.
Wait, there are people who don't switch hands as needed while raking? What if you were trying to rake something that was awkward to do on one side but not the other?
My niece was born with a condition where her two hemispheres don't communicate. Her only real problem was her eyes didn't want to look at the same thing at the same time. She had to have therapy and special glasses to teach her eyes to work together.
I mean, I suppose you could use a drum roll to lead into the joke but the "bu dum tss" of the 2 drum taps and a cymbal splash that punctuates a joke after it's been told is called a sting, not to be a know it all but today you found out lol
I would appreciate a video about Hemispherectomies! My best friend had a Hemispherectomy when she was 12 due to severe epilepsy and is now 30 with two bachelor degrees, currently working in editing while pursuing a career in theatre/music - she is trained in Opera and has the voice of an Angel.
You probably know more about patients who have had hemispherectomies than most doctors. It's a very rare procedure... more so than a corpus callosotomy. And, although there are success stories such as your friend, the procedure can lead to some terrible medical side effects. But, as you know, it is a procedure of last resort. Patients have suffered permanent brain damage from non-stop seizures, and often face certain death without it. I am glad to hear that your friend is living such a rewarding life.
@@Myopicvisions I personally do not no much about it but I do know about it being a last ditch effort with very high risk. Her having the surgery at 12 is also unique because typically if one has to be done, medical professionals try to get it done while the patient is younger. If you have more insight on these, please let me know! I love learning.
Peter Watts Blindsight is a book where the main POV character is a guy who underwent hemispherectomy at a young age. It's a fascinating story about consciousness and intelligence, but also transhumanism and all sorts of crazy things - another character is a linguist who purposefully split her mind into four different personalities to be more efficient at her work, there is a biologist so augmented with cybernetics it's hard to tell where he ends and his lab starts, and it has the most scientifically plausible vampires ever conceived. It can be a heavy, existential dread-inducing read filled with real scientific concepts, but highly recommended to anyone interested in neuropsychology and the nature of human mind.
not only do hemispheres have their own consciousness, even certain parts of the brain have one: apart from the frontal lobe which is more or less our salient consciousness, two important ones are the amygdala and the hippocampus (often said to be responsible for fear and memory respectively but that is an extremely oversimplified view) had a therapist who had this monster of a book about brain anatomy and he once guided me in communicating with those areas which was a fun albeit slightly surreal experience.
I wonder, are the amygdala and hippocampus shared between the hemispheres, or do they each control their own portion of them, or are they exclusive to one side or the other? Would activity in either the amygdala or hippocampus affect both sides of a split brain simultaneously, or would the two hemispheres have independent relationships with them?
For all my criticism of your production values in the past, this was a straight up informative and fascinating video. Thanks for listening to comments and taking them into consideration. These episodes have really been superb lately! Excellent topic this time, too. I took extreme interest in this topic as part of my studies in psychology class in high school and did a lot of reading and reports on it. Fascinating stuff!
I have a friend who has Complete Agenesis of the Corpus Callosum. It is interesting how the brain tries to compensate. She plays ukulele and draws amazingly (she can recreate any reference image photographically using pencil). She feels inadequate, but she’s pretty amazing, she’s writing and illustrating a children’s book, while raising her young children.
I wonder if, when patients realize/internalize their situation, they can have conversations with the other half of their brain using eg. picture/word cards or something like that.
I can have full on conversations with my split consciousness, including lies, and even some bullying. It's absolutely the most annoying and also never be lonely thing there is
What's even more outlandish are the epileptics who've had a hemispherectomy. I.e., An entire half of the brain is removed. Not just disconnected. That could be another video. People can manage with literally half a brain.
i find this both fascinating and a little disturbing that im made from 2 people who only get along because their brains are tied together lol. i have rarely heard anything on this topic other than an old CGP Grey video called "you are two" about the same subject. im sure the interactions between our brain halves are more complicated than this and we will probably not know fully for some time.
You have only one brain, but it develops specialized regions to process types of information. By specializing in one type of processing or another, the brain can selectively inhibit other regions to promote attention to a given task. Functionally, our brains are only able to integrate so much information at once. So, if all of the region's of our brain were to compete for attention at the same time, nothing would get done. With this regional specialization, pathways between regions become more important. This is why a corpus callosotomy gives the impression that their are two brains (the better term would be minds.) When the different regions are not able to communicate, alternatively inhibiting each other, things can go wrong. I'm also glad that Simon briefly touched on the soma, or body, informing the contralatteral side of the body in these patients. Our minds are a product of the communication from or bodies to our brains, and back to our bodies again. Some nerve tracts traveling up from our spinal column crossover from one side to the other before entering the brain, some don't. And then there are portions of our brain below the cortex that communicate information received from our bodies and our senses between the two halves of our brains. The optic nerves even do this, projecting fibers from both sides to different structures below the cortex before projecting to the visual cortex. It's a fascinating phenomenon, and I've had the opportunity to talk to patients and family members of those who have had corpus callosotomies. But sorry, we only have one brain. That is, unless you count our intestines - by some estimates, we have as many nerves linked together in our gut as are found in a cats brain. And one of the treatments used when those nerves become disorganized, is an old class of anti-depressant... although at about 1/10th the dose.
@@jamesmeppler6375 not really. You might enjoy reading Malcom Gladwell's book, Blink, to explore that idea further. There is a reason for it, but it's not what you think.
Simon, there's just so much information in this video and I'd really like to understand this subject, could you make a longer, more detailed video about split brain syndrome?
I’m a catamenial epileptic, meaning I only have seizures when I ovulate or am on my period. My identical twin sister has these seizures as well, but so seldom are hers that she is lucky to have three seizures a year. I can have about ten seizures every two weeks when my medications fail. Here’s something else about us both having this: we are likely mirror image twins. She is right-handed, I am left-handed. We’re farsighted in the opposite eyes. We even have moles in almost identical places on the opposite sides of our bodies. While they are temporal, I’ve never had scans of my brain to determine what side has the seizures, unfortunately, but it would be cool if we both could get scanned to see if they begin on the opposite side. It’s just impossible to predict when she’ll have a seizure… Lucky her! The brain is so interesting! I always thought the nervous system and psychology were interesting subjects!
My cousin has agenesis of the corpus callosum (ACC), which means that she was born with most of her corpus callosum missing. (There's still some CC there: some people with ACC have more CC than others; some are born with their CC entirely missing.) She has trouble with body coordination between her two sides (she has an unusual gait, for instance) and while she understands what you say to her, and knows what she wants to say, she often has significant trouble expressing herself. She'll often struggle to come up with a friend's name, and finally turn to her mom and say, "She wears green hairbows" or something, and her mom will supply the name. People with ACC have a wide range of symptoms and symptom severity, and my cousin's symptoms are actually relatively mild. There's also some evidence that some people diagnosed with Autism Spectrum Disorder may actually have ACC!
As soon as I saw the thumbnail, I knew it'd be a cool video about corpus callosoromy. It's one of the most fascinating things in neuroligy if you ask me. Also, for everyone, I recommend seeing CGP Grey's video on it after this, it's pretty cool as well
I attended a conference on intractable epilepsy back in the 90's, where physicians, patients, and family members were present. When the topic of performing corpus callosotomies came up, I was surprised to hear family members of patients in the audience who felt it was a blessing, and others felt it was a curse. It should be noted that the procedure is often performed when the epilepsy is intractable, or can't be controlled, and the seizure activity spreading from on e hemisphere to the other is threatening the patient with permanent brain damage, or worse. As strange as the procedure may seem, it is often the last resort to prevent something much worse. But it was interesting to hear how passionate family members were that were for the procedure, or against it.
Bob's! Worked with brqin tumor patients for 5 years. I met a woman whi had her left hemispheres COMPLETELY removed. It took years to adapt, of course, but she was probably functioning with 70 - 75% coherency with some short and long-term memory issues. She attended a Symposium alone, ate dinner and cared for herself with minimal help. Just amazing. One hemisphere's lobes and multiple "tasks" can make up for the loss of the others'. Also, she was a proper badass!
It might literally be an abstraction of the two halves exchanging information, yes. Like if they were split physically and had to communicate via sign language, or writing, so that the other half can understand the reasoning, but conveniently the two halves also have access to an internal-net chatroom ;~}
@@Arkios64 no, the two halves are not complete brains in themselves, so that wouldn't be possible. Simon actually explains how patients were unable to process words or assign meaning to them if they were presented to only one half of the brain. For that reason, one hemisphere couldn't have a conversation with the other. Both halves of your brain would be required to generate internal speech.
Simon didn't really talk about this, but the procedure is often performed to prevent permanent brain damage and death from uncontrollable seizures spreading from one hemisphere to the other. I attended a conference on intractable epilepsy (uncontrolled) back in the 90's. There were physicians, scientists, patients, and family members who talked. I met patients, and family members of patients, who had the procedure done. Some felt that it had changed their life for the better, others felt it was a disaster. But many of those patients might not have survived very long without it, or their quality of life would have been great reduced.
Thank you for this interesting video! I was also born without the cospus callosum (which was only found out in a mri brain scan I had done bc of headaches in my late 20ies), and I don't really see how I'm different from "normal" people. The doctor was like: "Yes. You don't have this bridge. Doesn't matter. Doesn't explain your headache. Go home." I think my brain still wired itself somehow during my childhood, so there is (almost?) no dofference to a person with the brain intact. People who got their corpus callosum removed will have troubles of course, because their "bridge" is cut and the brain impulses don't know another way to get to their destination.
This whole entire concept is giving me an existential crisis. How do you deal with it? Do you feel like one person still? How can the two halves be disconnected yet you still are only one person
@@Apathy474 well the brain halves are not actually "disconnected", just lack that one important shortcut part between them that is the corpus callosum. So I might need longer to think than people with the bridge bc my brain had to find other ways to function. I don't know. Can't find any info on that stuff. Also I got diagnosed with ADHD last year and think that I also might be autistic, which explains all my life's issues, so maybe there is a connection. Maybe not. I suspect that's genetic and my family members might also lack it, but as no one else cares, there's no chance to know lol
When I had a stroke to the left side of my brain stem it effected me in much the same way as if I had experienced a stroke to the main portion of my left brain. I could not remember my mother's name is Gail, but I could remember my father's name since it is the same as my middle name. I had my right arm and right leg unable to function normally prior to physical therapy and my speech was slurred as if I were drunk. Interestingly when my neurologist told me the stroke was to my brain stem and not the main portion of my left brain I gasped because even before any of my therapy began I remembered that parts of brain stem control the diaphragm and the node of the heart that control breathing and heart beat respectively. Until this happened to me I did not know it was even possible to survive a stroke to brain stem because of this. As my cousin pointed out when he was in medical school, one of the first and most important things he learned is that we know far less about how the human body works than we think we know.
I’m so used to watching Simon screaming and slapping his script that watching him be a calm, collected, and concise host is like being transported to an alternate dimension…and I found this channel first
So if you hear someone talk to themself the next time, maybe the person is convincing his or her other brain's half of what to do right now or asking if the brain half is on board with that to reduce unforseen conflict.
It's not that simple. Having a conversation with your self simultaneously uses parts of your brain in both hemispheres. You can't "talk" to the other half of your brain, especially if they are still connected. And, if they were separate, as the video explains, one half would have trouble processing the speech without being connected to the opposite half. Because of the speciization, the right side would have trouble assigning meaning and context without connecting to the left.
When I was born I had structural damage to my corpus callosum, it's been a weird life. But at the age of well puberty I literally felt my brain rewire itself so instead of having two hemispheres I have one integrated brain, don't ask me how I know this I have no idea. But the point is that neural architectures are very robust.
May I suggest you contact Andrew Huberman. He’s a neurosurgeon from Stanford who is leading new studies on and treatments for the brain and has videos explaining a lot of what he’s doing. He’d love to talk to someone like you as you seem to have a unique mind, literally.
I know someone who has a tumor on his Corpus callosum. I don't think he has split brain but he does tend to latch onto weird ideas and hold irrational beliefs.
@@peterjf7723 what you describe is more likely an involvement of portions if the prefrontal cortex, and not injury to the corpus callosum from the tumor.
I have a friend who had this surgery because of severe epilepsy syndrome called Lennox gastaut. He still have some seizure from time to time but at least now he has a life . With this surgery he made advantage of it , he practice reading 2 books at same time , writing both hands at same time one thing that was easy was drawing square, rectangle, etc… but writing that took lot of effort , he still wonder how people’s do to write with left hand…. Ha say they are handicapped more than him .
I was trying to come up with a good analogy to describe the brain to people. I came up with a "family" analogy. Each half of the brain is a member of a family. A family will make decisions as a group where each individual has a say in the matter, but there is always one adult that is "the boss" that makes the final decision. So the left brain (adult) favorite food maybe sushi, the right brain (child) favorite food maybe mcdonalds. The compromise maybe steak house, so the person as a whole may say steak is their favorite food. They will like sushi, but more often will wind up at mcdonalds.
As he was describing the alien arm symptoms and just before he mentioned Dr Strangelove; I was picturing the part of Dr Strangelove where he's looking in his coat for his calculation slide and the "dead arm" just slowly comes up on screen with the slide in it.
I read about this while doing research the old fashioned way by going through the periodic guide and punching the publications for a paper on educating both sides of the brain (in the pre internet days). I also learned that those who can make intuitive leaps have a higher ratio of corpus calosum to brain size.
The results of cutting the corpus callosum is what interested me enough to get a degree in psychology. The mirror box for phantom pain also works if you haven't lost a limb and have olympic cramping in one limb. I've done this for my toes before. Super fascinating stuff!
I had a traumatic brain injury in 1969. One effect has been a peculiar memory defect where I can't recall information that I know well when their is any anxiety about the memory in an episode very similar to a petit mal seizure.
Kind of funny we use the phrase “I’m no brain surgeon” to say “I’m not the smartest” yet actual brain surgeons have done some of the dumbest shit in history
I remember hearing about a split brain individual who was shown one picture via the left eye and a different one on the right. When asked what they saw, they responded by what the left (verbal) hemisphere saw, subsequently adding, "But why am I shaking my head 'no'?" Note to the TIFO team, if you are going to reference Peter Sellers *as* Dr. Strangelove... *make sure you use a still of him actually IN the role* . He portrayed THREE characters in that film. (HINT: You want the one where he's in a wheelchair.)
Holy crap I am NEVER going to an old timey doctor with a headache. “This woman is acting independently? Let’s shove an ice pick up her nose and swirl it around! This guy has epilepsy? Let’s slice his brain in half. Surely this large, central section of the brain is vestigial, or something!”
I was born with a split in my corpus callosum which I only found out about this year through a diagnosis mri scan (to find out why my eyesight is so bad) and I'm so intrigued as to how and why it develops naturally. There are a lot of people who get surgury to purposly split it for medical reasons but I have never met another person like me who has it naturally.
I'm curious about how your case differ. Because brain is very flexible did both brain learnt to work separately, like both brain can communicate since they cant rely on the other half to do half of the work.
@@TheEllord33 Do you still think you only have one center of consciousness despite having two brains? Or do you think you are literally two distinct selves with two consciousness and one isn't aware of the other? This would depend on whether you believe consciousness is the brain or something different from the brain I suppose. If you believe the side controlling the body and the side that wrote your comment is conscious do you believe the other side has its own consciousness that is helplessly observing your body being controlled by the other side? Do you still consider yourself to be just one person? These are deep questions, but I'm asking to see whether you think consciousness is different than the brain and whether you think you have a soul which is still one unified consciousness. If not then you would have to reason that the side of your brain that isn't controlling the body is a helpless observer who is just observing its body being controlled outside its will.
I had this surgery done about 15 years ago, had to get my right frontal lobe taken out as well. My neurosurgeon told me because that part was taken out the left side of my body would be a lot more weak than it was before. So I had to go through a lot of pt.
The optical chiasma is more tricky than you note: the right half of the field of vision from each eye is processed by the left brain, the left field of vision is processed by the right brain. To determine a distance to an object requires 2 inputs -- a determination resulting from parallax function in the brain. So 2 distance perceptions are needed to accomplish this. More complication: the image perceived by each eye is upside down.
I'd be curious how it works now when they remove part of the brain for like people who have really bad seizures. How does that work? I've heard that's what they do now.
Or maybe someone finally paid attention to what he said and noticed he does zero to make sure his script is accurate. Mostly small mistakes Here he said when showing a picture the right hand was able to identify it. But shown a picture the right hand was not. Immediately contradicting himself...how can people enjoy a fact show when he says the direct opposite of what he should be saying
@@jamesmeppler6375 hey, blame the fact boi and or his team. 10+ channels and hella recording/editing/coordinating just means it's bound to happen. Simon will either press down and work harder for consistency, or slowly lose relevance due to it. Eventually, it won't just be honest mistakes, but there's still great charm and entertainment to be had (from my perspective)
The cover image makes me think this is Business Blaze.. but it's Today I Found Out... The 2 most polarized versions of Simon in terms of professional behavior.
There are instances of brains functioning properly without the corpus callosum in the Lac-Saint-Jean region of Quebec. There's been studies on the case. It's quite interesting to see how the brain can mutate and adapt.
One thing to clarify, the both eyes are connected to both sides, but the nerves are split down the center of the eye such that each hemisphere sees roughly half of the overall image. We literally see a composite of a separately created left and right image.
Does the side of the ear change which hemisphere the noise is being registered by? Or are the ears interconnected? Could they be "learning" two things at once with two different headphones?
I REALLY liked this video. The question that I kept thinking about was...and I know there are very few of these patients, has any of the split brain patients figure out a way either purposely or not, to some sort of advantage? There seems like there would be a way, maybe with specific training or practice, to do two or more completely different tasks that a normal person could not do. I can't think of anything off the top of my head..but playing the piano comes to mind, where when I try my left hand wants to copy my right hand. Bad example I know...but surely have basically two brains that may or may not act independently has to have some advantage.
Thats actually a really good example and a super interesting way to think, I believe that they do havesome sort of advantage like you mentioned, I seen a comment someone who doesnt have that part of their brain where they said they can drown two different shapes at the exact same time, a square with one hand and a circle with the other
Fascinating! Regarding the left hand being more often the troublemaker, did you know the derivation of the word “sinister”? It comes from a Latin word meaning “on the left side, unlucky, inauspicious.” Interesting eh?
With language centers on the left, the right consciousness can't communicate. It can hear what the left side consciousness is doing and can't interact outside of physical cues. Makes you wonder if the left arm lashing out is the pent up frustration of being stuck in this state.
I don't have access to my left side because of nurturing. I'm actually doing everything I can to stop thinking right and start thinking left. Do to my nurturing, I lost all faith in left brain activities and forced my logic side (the right) to take full control. From that information, I knew more about humans than ever before.
The split brain cases have always been super fascinating to me. I have a morbid curiosity to have it done for myself although I know that would never happen
There are times I have looked at or thought of an object and couldn't remember the name but could describe what it looks like and what it's use is.. Could this be because there is something wrong with that connection?
The splitting headache comment was the patient making a joke. You repeating that ironically is awesome. Thumbs on the video overall, but PLEASE have someone with a background in either neurology or neuroscience read your scripts to avoid confusing wording. -The CP is NOT correcting some mistake made by the eyes sending signals to the wrong side of the brain. The primary visual info is going exactly where it is supposed to. - It's not that each hemisphere of the brain receives info from ONLY the opposite eye directly. Each side of the (human) brain gets primary visual information from both eyes. What's happening is that each eye gets information from the opposite/contralateral Visual Field and this distinction is crucial b/c it has implications for foveate animals like us versus animals that lack binocular vision. Because we have binocular vision, there is a lot of overlap in the signal going to both sides of the brain from each eye. Compare that to something like a horse, with little binocular vision, and then most of the primary input is from the contralateral eye, and most of the visual info from the same side arrives across the CP. Please see the diagram on the Wikipedia page for vision: en.wikipedia.org/wiki/Visual_system
6:39 I always thought of myselfe as a "we". I used to think I was just thinking of an imaginary friend, because society taught me that. But as the image of that "friend" faded, I kept talking and thinking to myselfe, as if I had to explain stuff to me, even tho that means I already understood it. I even get annoyed, when I dont finish that sentence (I also mostly think in full sentences), even tho subconsciously I already know what I was gonna think or say, and often start over. Maybe im not as crazy as I thought, but just explaining stuff to my other half.
Thank you for the video, British Vsauce
bruh😭
noone comes close to Vsauce...or Simon...both are just absolutely brilliant in their own areas ..... or are they *vsauce music*
Now i cant unsee it,
Thanks
Was not expecting to see you here. Thats a nice surprise? Manga/Anime about Simon farming UA-cam channels incoming?
@@keith_5584 please I need to see this now
What's the color?
Left Brain: Red
Right Brain: >:(
Left Brain: Ahh, I mean green. Yeah, that one.
🤣
Imagine having this operation, and upon waking up you find you can't talk. You can't control your body, and some other person claiming to be you is doing all the talking and moving. You are struggling to to communicate, to let everyone know that you exist. Eventually you manage to get control of one of your hands ...
Thanks for the nightmares
This is what I was thinking when he said sometimes the left hand tries to choke the person. Maybe that side of the brain is in crisis because it can’t communicate.
No wonder why they're hands try and choke them in their sleep
Yeah, that part was scary. My human brain that is intact says that it would not like that experience. :)
Sounds like a Greg Egan short story.
No, he literally wrote a story like that.
right and left brain disconnect is one of the most interesting things ive found on the internet in my 20years ive spent browsing it.
i first read about it in books long before the internet, when computers were still the size of a room.
Me too.
This is crazy!! My son is getting this procedure done tomorrow morning. I literally just sat down after checking in to the hotel and this video pops up. It’s actually his second time with this procedure. We opted for laser ablation last September and two small areas had enough missed to make a reconnection. If everyone could say a little prayer tonight we’d appreciate it.
I believe in a soul absolutely and I believe in science too. I will pray for your family.
Best wishes.
Prayers
🙏
It’s the next day that I’m seeing this so prayers that everything went well and for a speedy recovery.
This leads me to believe that people are actually twice as dumb as everyone originally thought.
lol
So basically the two hemispheres are like "Business Blaze Simon" and "Today I Found Out Simon"
Which nostril does he prefer when you show him a "snowy field" then you will know which side is which
@@antitheziz717 LMAO
@@antitheziz717 the right nostril. The left side wouldn't be able to acknowledge the intoxicating avalanche of "snow".
no, TIFO simon is the same shill simon... if you put it on the teleprompter he'll say it.
he just pays people to put things on there now...
Glad they all lived my fiance died by being hit by a drunk driver. She seemed okay then went into a coma and died.
She died by visiting me. (I am using an other account and writing)
Alien hand syndrome really is fascinating. Brains are fascinating in general. Neuroscience is an amazing thing. What we know about the brain is still far outweighed by what we don’t.
Brains sure are amazing, a perfect example of the uncertainty theory. Which is why clones would never be the same person, it's impossible for their brains to grow the same way
If the brain were so simple that we could understand it, then we would be so simple we couldn't.
The bit about the hand attacking the person rather says to me that the brain is acting out in frustration because they can't communicate with its other half.
Not really, we know an awful lot about the functional processes of the brain. The problem is, neurology is the study of the nervous system, which can be viewed in terms of behavior, function, organization, physiology, and anatomy. None of these contexts can explain the whole by itself. And the failure of the human connectome project illustrates the difficulty of trying to study one aspect in isolation.
@@jamesmeppler6375 what we consider a person is a theory of mind, which is a function of an interplay between our brains and out bodies. This is why the concept of transhumanism is completely unrealistic. That said, I would encourage you to read up on the Minnesota twin study - both the findings and the criticism. There were twins who weren't raised in the same household that exhibited nearly identical personality traits and behaviors. It raises a lot of questions.
Here is something interesting: Sometimes when I'm feeling agitated, bored, or just generally upset, if I choose to do a task with my left hand, the sensation goes away. I've learned this is sort of my right brain asking to be acknowledged, almost as another personality. I first noticed this while driving long distances. Apparently, my right hemisphere enjoys driving, and being given other tasks (including typing). Btw, while I'm slightly left-hemisphere dominant, using my right hand more often, I am very ambidextrous. I can write, shave, brush my teeth/hair, sweep/rake, and stir things with both hands, and in fact, for some tasks, I don't know which is the "right" way to do a task. My dad "caught" me sweeping and raking the "wrong" way a few times, and tried to force me to do it from only one side. This felt extremely awkward, being unable to switch sides depending on which was needed to do the task more efficiently, as well as feeling punishing, as if a part of me was being punished for simply showing it existed. He also refused to allow me to practice writing or batting left-handed. I've also witnessed various people noticing, and being surprised and somehow disconcerted by seeing people on t.v. doing something left-handed, such as stirring in a bowl. I would love to participate in brain scan studies, to understand better who I am in total. We might discover brain lateralisation to be a factor in depression, and that giving a depressed person bilateral or left-handed tasks to practice might be part of effective treatment.
This is very interesting! Give your right hemisphere a cookie from me ;-).
Very interesting. I am an engineer. When I get stuck on a problem, at some point, I just need to do something else. Exercise can help, but something like drawing, painting or playing guitar works better. At some point, the answer just pops into my head as if my subconscious kept working on the problem the whole time while the conscious was busy with something else, rather than obstinately standing in the way of a non-standard solution. I've learned when it's time to do something else.
Also, I am right handed, and regularly played a right handed opponent. He was having back problems and decided to play left handed to balance out the muscles in his back. I switched to my left hand to keep a level playing field. I was surprised to discover playing left handed improved my right hand game!
@@Incandescentiron I love this. You're into something. Try ping pong. I switch hands, and am equally good either handed, but my best is when I keep switching during play. I hypothesise that intentionally using both sides makes our whole brain work better.
Wait, there are people who don't switch hands as needed while raking? What if you were trying to rake something that was awkward to do on one side but not the other?
@@Incandescentiron just like Archimedes that got his" eureka " moment after a relaxing bath 😉
My niece was born with a condition where her two hemispheres don't communicate. Her only real problem was her eyes didn't want to look at the same thing at the same time. She had to have therapy and special glasses to teach her eyes to work together.
I’m enjoying watching Simon grow ever closer to wizard beard
Currently a young Saint Nick
I'm starting to get grossed out by alot of breads I see. They don't look good
Simon's looks okay better than a lot I seen
Simon's is a beard's beard.
Drumroll for splitting headache?
It's called a sting, not a drumroll lol
I mean, I suppose you could use a drum roll to lead into the joke but the "bu dum tss" of the 2 drum taps and a cymbal splash that punctuates a joke after it's been told is called a sting, not to be a know it all but today you found out lol
XP, it depends on which side of your brain is thinking about it.
@@xp7575
also known as a rimshot(: was a band nerd back in the day haha
I would appreciate a video about Hemispherectomies! My best friend had a Hemispherectomy when she was 12 due to severe epilepsy and is now 30 with two bachelor degrees, currently working in editing while pursuing a career in theatre/music - she is trained in Opera and has the voice of an Angel.
You probably know more about patients who have had hemispherectomies than most doctors. It's a very rare procedure... more so than a corpus callosotomy. And, although there are success stories such as your friend, the procedure can lead to some terrible medical side effects. But, as you know, it is a procedure of last resort. Patients have suffered permanent brain damage from non-stop seizures, and often face certain death without it. I am glad to hear that your friend is living such a rewarding life.
@@Myopicvisions I personally do not no much about it but I do know about it being a last ditch effort with very high risk. Her having the surgery at 12 is also unique because typically if one has to be done, medical professionals try to get it done while the patient is younger. If you have more insight on these, please let me know! I love learning.
😯
Peter Watts Blindsight is a book where the main POV character is a guy who underwent hemispherectomy at a young age. It's a fascinating story about consciousness and intelligence, but also transhumanism and all sorts of crazy things - another character is a linguist who purposefully split her mind into four different personalities to be more efficient at her work, there is a biologist so augmented with cybernetics it's hard to tell where he ends and his lab starts, and it has the most scientifically plausible vampires ever conceived. It can be a heavy, existential dread-inducing read filled with real scientific concepts, but highly recommended to anyone interested in neuropsychology and the nature of human mind.
@@cmdr.shurimal8980 I'm sold!! Will find a copy of that asap :D Thank-you for the recommendation!
not only do hemispheres have their own consciousness, even certain parts of the brain have one: apart from the frontal lobe which is more or less our salient consciousness, two important ones are the amygdala and the hippocampus (often said to be responsible for fear and memory respectively but that is an extremely oversimplified view)
had a therapist who had this monster of a book about brain anatomy and he once guided me in communicating with those areas which was a fun albeit slightly surreal experience.
What's the name of the book?
I wonder, are the amygdala and hippocampus shared between the hemispheres, or do they each control their own portion of them, or are they exclusive to one side or the other? Would activity in either the amygdala or hippocampus affect both sides of a split brain simultaneously, or would the two hemispheres have independent relationships with them?
For all my criticism of your production values in the past, this was a straight up informative and fascinating video. Thanks for listening to comments and taking them into consideration. These episodes have really been superb lately! Excellent topic this time, too. I took extreme interest in this topic as part of my studies in psychology class in high school and did a lot of reading and reports on it. Fascinating stuff!
I have a friend who has Complete Agenesis of the Corpus Callosum. It is interesting how the brain tries to compensate. She plays ukulele and draws amazingly (she can recreate any reference image photographically using pencil). She feels inadequate, but she’s pretty amazing, she’s writing and illustrating a children’s book, while raising her young children.
I wonder if, when patients realize/internalize their situation, they can have conversations with the other half of their brain using eg. picture/word cards or something like that.
Awesome, actually never thought about that...
I wonder if they learned sign language if the dormant side could spell what it wanted to say
I can have full on conversations with my split consciousness, including lies, and even some bullying. It's absolutely the most annoying and also never be lonely thing there is
What's even more outlandish are the epileptics who've had a hemispherectomy. I.e., An entire half of the brain is removed. Not just disconnected. That could be another video. People can manage with literally half a brain.
sounds gruesome but I am odly intrigued.
Weird thought. but if both hemispheres of the brain are equally conscious then isn't that technically murder?
i find this both fascinating and a little disturbing that im made from 2 people who only get along because their brains are tied together lol. i have rarely heard anything on this topic other than an old CGP Grey video called "you are two" about the same subject. im sure the interactions between our brain halves are more complicated than this and we will probably not know fully for some time.
Read "The Master and His Emissary: The Divided Brain and the Making of the Western World" by Iain McGilchrist... That's a great book and very nuanced.
Is this why my concious and subconscious feel differently about things? Like I think,do I want chocolate. I say yes but my inner voice says no
You have only one brain, but it develops specialized regions to process types of information. By specializing in one type of processing or another, the brain can selectively inhibit other regions to promote attention to a given task. Functionally, our brains are only able to integrate so much information at once. So, if all of the region's of our brain were to compete for attention at the same time, nothing would get done. With this regional specialization, pathways between regions become more important. This is why a corpus callosotomy gives the impression that their are two brains (the better term would be minds.) When the different regions are not able to communicate, alternatively inhibiting each other, things can go wrong. I'm also glad that Simon briefly touched on the soma, or body, informing the contralatteral side of the body in these patients. Our minds are a product of the communication from or bodies to our brains, and back to our bodies again. Some nerve tracts traveling up from our spinal column crossover from one side to the other before entering the brain, some don't. And then there are portions of our brain below the cortex that communicate information received from our bodies and our senses between the two halves of our brains. The optic nerves even do this, projecting fibers from both sides to different structures below the cortex before projecting to the visual cortex. It's a fascinating phenomenon, and I've had the opportunity to talk to patients and family members of those who have had corpus callosotomies. But sorry, we only have one brain. That is, unless you count our intestines - by some estimates, we have as many nerves linked together in our gut as are found in a cats brain. And one of the treatments used when those nerves become disorganized, is an old class of anti-depressant... although at about 1/10th the dose.
@@jamesmeppler6375 not really. You might enjoy reading Malcom Gladwell's book, Blink, to explore that idea further. There is a reason for it, but it's not what you think.
Dude, it took two people to make you...what are you on about. lol
Simon, there's just so much information in this video and I'd really like to understand this subject, could you make a longer, more detailed video about split brain syndrome?
I’m a catamenial epileptic, meaning I only have seizures when I ovulate or am on my period. My identical twin sister has these seizures as well, but so seldom are hers that she is lucky to have three seizures a year. I can have about ten seizures every two weeks when my medications fail. Here’s something else about us both having this: we are likely mirror image twins. She is right-handed, I am left-handed. We’re farsighted in the opposite eyes. We even have moles in almost identical places on the opposite sides of our bodies. While they are temporal, I’ve never had scans of my brain to determine what side has the seizures, unfortunately, but it would be cool if we both could get scanned to see if they begin on the opposite side. It’s just impossible to predict when she’ll have a seizure… Lucky her! The brain is so interesting! I always thought the nervous system and psychology were interesting subjects!
Ash J Williams: "My hand went bad. So I cut it off at the wrist."
Good video 👍
Wow, this was an incredibly informative video, and BEYOND fascinating! Thanks so much for the content, Simon!
Fact Boi is back with the facts!
My cousin has agenesis of the corpus callosum (ACC), which means that she was born with most of her corpus callosum missing. (There's still some CC there: some people with ACC have more CC than others; some are born with their CC entirely missing.) She has trouble with body coordination between her two sides (she has an unusual gait, for instance) and while she understands what you say to her, and knows what she wants to say, she often has significant trouble expressing herself. She'll often struggle to come up with a friend's name, and finally turn to her mom and say, "She wears green hairbows" or something, and her mom will supply the name. People with ACC have a wide range of symptoms and symptom severity, and my cousin's symptoms are actually relatively mild. There's also some evidence that some people diagnosed with Autism Spectrum Disorder may actually have ACC!
As soon as I saw the thumbnail, I knew it'd be a cool video about corpus callosoromy. It's one of the most fascinating things in neuroligy if you ask me.
Also, for everyone, I recommend seeing CGP Grey's video on it after this, it's pretty cool as well
I attended a conference on intractable epilepsy back in the 90's, where physicians, patients, and family members were present. When the topic of performing corpus callosotomies came up, I was surprised to hear family members of patients in the audience who felt it was a blessing, and others felt it was a curse. It should be noted that the procedure is often performed when the epilepsy is intractable, or can't be controlled, and the seizure activity spreading from on e hemisphere to the other is threatening the patient with permanent brain damage, or worse. As strange as the procedure may seem, it is often the last resort to prevent something much worse. But it was interesting to hear how passionate family members were that were for the procedure, or against it.
Great video! How does, loosing one eye, change these dynamics? Fascinating.
each eye is divided left/right so both sides would still have a visual field
Bob's! Worked with brqin tumor patients for 5 years. I met a woman whi had her left hemispheres COMPLETELY removed. It took years to adapt, of course, but she was probably functioning with 70 - 75% coherency with some short and long-term memory issues. She attended a Symposium alone, ate dinner and cared for herself with minimal help. Just amazing.
One hemisphere's lobes and multiple "tasks" can make up for the loss of the others'.
Also, she was a proper badass!
This might explain the arguments I have in my head with myself!
It might literally be an abstraction of the two halves exchanging information, yes.
Like if they were split physically and had to communicate via sign language, or writing, so that the other half can understand the reasoning, but conveniently the two halves also have access to an internal-net chatroom ;~}
@@Arkios64 no, the two halves are not complete brains in themselves, so that wouldn't be possible. Simon actually explains how patients were unable to process words or assign meaning to them if they were presented to only one half of the brain. For that reason, one hemisphere couldn't have a conversation with the other. Both halves of your brain would be required to generate internal speech.
As long as split brain humans have split big brains, I’m sure they prefer that to seizures.
Simon didn't really talk about this, but the procedure is often performed to prevent permanent brain damage and death from uncontrollable seizures spreading from one hemisphere to the other. I attended a conference on intractable epilepsy (uncontrolled) back in the 90's. There were physicians, scientists, patients, and family members who talked. I met patients, and family members of patients, who had the procedure done. Some felt that it had changed their life for the better, others felt it was a disaster. But many of those patients might not have survived very long without it, or their quality of life would have been great reduced.
Thank you for this interesting video!
I was also born without the cospus callosum (which was only found out in a mri brain scan I had done bc of headaches in my late 20ies), and I don't really see how I'm different from "normal" people.
The doctor was like: "Yes. You don't have this bridge. Doesn't matter. Doesn't explain your headache. Go home." I think my brain still wired itself somehow during my childhood, so there is (almost?) no dofference to a person with the brain intact. People who got their corpus callosum removed will have troubles of course, because their "bridge" is cut and the brain impulses don't know another way to get to their destination.
This whole entire concept is giving me an existential crisis. How do you deal with it? Do you feel like one person still? How can the two halves be disconnected yet you still are only one person
@@Apathy474 well the brain halves are not actually "disconnected", just lack that one important shortcut part between them that is the corpus callosum. So I might need longer to think than people with the bridge bc my brain had to find other ways to function. I don't know. Can't find any info on that stuff. Also I got diagnosed with ADHD last year and think that I also might be autistic, which explains all my life's issues, so maybe there is a connection. Maybe not. I suspect that's genetic and my family members might also lack it, but as no one else cares, there's no chance to know lol
When I had a stroke to the left side of my brain stem it effected me in much the same way as if I had experienced a stroke to the main portion of my left brain. I could not remember my mother's name is Gail, but I could remember my father's name since it is the same as my middle name. I had my right arm and right leg unable to function normally prior to physical therapy and my speech was slurred as if I were drunk. Interestingly when my neurologist told me the stroke was to my brain stem and not the main portion of my left brain I gasped because even before any of my therapy began I remembered that parts of brain stem control the diaphragm and the node of the heart that control breathing and heart beat respectively. Until this happened to me I did not know it was even possible to survive a stroke to brain stem because of this. As my cousin pointed out when he was in medical school, one of the first and most important things he learned is that we know far less about how the human body works than we think we know.
This is your most interesting video I’ve seen. Nice job.
The bit about restraining your hand at night for bed had me lol.
I’m so used to watching Simon screaming and slapping his script that watching him be a calm, collected, and concise host is like being transported to an alternate dimension…and I found this channel first
Wait. What?
@@seanj3667 watch Simon on business blaze. You’ll understand
@@munchypignati8701 I did last night. I don't like coked up Simon. I like mellow Simon.
@@seanj3667 Coked up Simon is the best Simon.
Have y’all tried Casual Criminalist Simon?
Amazing information 👌 thanks 😊
So if you hear someone talk to themself the next time, maybe the person is convincing his or her other brain's half of what to do right now or asking if the brain half is on board with that to reduce unforseen conflict.
It's not that simple. Having a conversation with your self simultaneously uses parts of your brain in both hemispheres. You can't "talk" to the other half of your brain, especially if they are still connected. And, if they were separate, as the video explains, one half would have trouble processing the speech without being connected to the opposite half. Because of the speciization, the right side would have trouble assigning meaning and context without connecting to the left.
Your profile picture just gave me massive nostalgia. :)
@@Atlessa You're welcome :D
just goes to prove that left handed people are in their right mind lol
When I was born I had structural damage to my corpus callosum, it's been a weird life. But at the age of well puberty I literally felt my brain rewire itself so instead of having two hemispheres I have one integrated brain, don't ask me how I know this I have no idea. But the point is that neural architectures are very robust.
i have no need to ask how you know that. You were there the entire time were you not?! !:-) 🖖
What did it feel like?
May I suggest you contact Andrew Huberman.
He’s a neurosurgeon from Stanford who is leading new studies on and treatments for the brain and has videos explaining a lot of what he’s doing. He’d love to talk to someone like you as you seem to have a unique mind, literally.
I know someone who has a tumor on his Corpus callosum. I don't think he has split brain but he does tend to latch onto weird ideas and hold irrational beliefs.
@@peterjf7723 what you describe is more likely an involvement of portions if the prefrontal cortex, and not injury to the corpus callosum from the tumor.
Plasticity of the brain in patients with no corpus callosum is amazing.
Outstanding! As always.
Super interesting video!
I have a friend who had this surgery because of severe epilepsy syndrome called Lennox gastaut.
He still have some seizure from time to time but at least now he has a life .
With this surgery he made advantage of it , he practice reading 2 books at same time , writing both hands at same time one thing that was easy was drawing square, rectangle, etc… but writing that took lot of effort , he still wonder how people’s do to write with left hand…. Ha say they are handicapped more than him .
I literally just watched that episode of House the other day. Such an interesting thing!
Do you imagine having a split brain and lose one eye? It'd be the weirdest thing ever...
I was trying to come up with a good analogy to describe the brain to people. I came up with a "family" analogy. Each half of the brain is a member of a family. A family will make decisions as a group where each individual has a say in the matter, but there is always one adult that is "the boss" that makes the final decision. So the left brain (adult) favorite food maybe sushi, the right brain (child) favorite food maybe mcdonalds. The compromise maybe steak house, so the person as a whole may say steak is their favorite food. They will like sushi, but more often will wind up at mcdonalds.
God Simon, you are definitely one of a kind. Another reason to be glad to be born into this time
As he was describing the alien arm symptoms and just before he mentioned Dr Strangelove; I was picturing the part of Dr Strangelove where he's looking in his coat for his calculation slide and the "dead arm" just slowly comes up on screen with the slide in it.
I wish there were more videos on split brain! It's a very interesting subject.
I read about this while doing research the old fashioned way by going through the periodic guide and punching the publications for a paper on educating both sides of the brain (in the pre internet days). I also learned that those who can make intuitive leaps have a higher ratio of corpus calosum to brain size.
The results of cutting the corpus callosum is what interested me enough to get a degree in psychology. The mirror box for phantom pain also works if you haven't lost a limb and have olympic cramping in one limb. I've done this for my toes before. Super fascinating stuff!
Thank you
He had a "Splitting" headache. I see what you did there 😂😂
I had a traumatic brain injury in 1969. One effect has been a peculiar memory defect where I can't recall information that I know well when their is any anxiety about the memory in an episode very similar to a petit mal seizure.
Kind of funny we use the phrase “I’m no brain surgeon” to say “I’m not the smartest” yet actual brain surgeons have done some of the dumbest shit in history
I remember hearing about a split brain individual who was shown one picture via the left eye and a different one on the right. When asked what they saw, they responded by what the left (verbal) hemisphere saw, subsequently adding, "But why am I shaking my head 'no'?"
Note to the TIFO team, if you are going to reference Peter Sellers *as* Dr. Strangelove... *make sure you use a still of him actually IN the role* . He portrayed THREE characters in that film. (HINT: You want the one where he's in a wheelchair.)
Holy crap I am NEVER going to an old timey doctor with a headache.
“This woman is acting independently? Let’s shove an ice pick up her nose and swirl it around!
This guy has epilepsy? Let’s slice his brain in half. Surely this large, central section of the brain is vestigial, or something!”
Old timey medicine was crazy 😭😭 Those doctors always chose the worst option. They always chose violence 😂😂
Thank you🧠
SIMON: Not quite the "two for the price of one" situation you might hope for.
ME: At least, the benefits make it more worthy than anything else
That was awesome!! 😃
The man of 100 channels
The brain, the center of our understanding and we don't understand it entirely.
What we know will always be eclipsed by that which we do not know :)
I was born with a split in my corpus callosum which I only found out about this year through a diagnosis mri scan (to find out why my eyesight is so bad) and I'm so intrigued as to how and why it develops naturally. There are a lot of people who get surgury to purposly split it for medical reasons but I have never met another person like me who has it naturally.
I'm curious about how your case differ. Because brain is very flexible did both brain learnt to work separately, like both brain can communicate since they cant rely on the other half to do half of the work.
@@TheEllord33 Do you still think you only have one center of consciousness despite having two brains? Or do you think you are literally two distinct selves with two consciousness and one isn't aware of the other? This would depend on whether you believe consciousness is the brain or something different from the brain I suppose. If you believe the side controlling the body and the side that wrote your comment is conscious do you believe the other side has its own consciousness that is helplessly observing your body being controlled by the other side? Do you still consider yourself to be just one person? These are deep questions, but I'm asking to see whether you think consciousness is different than the brain and whether you think you have a soul which is still one unified consciousness. If not then you would have to reason that the side of your brain that isn't controlling the body is a helpless observer who is just observing its body being controlled outside its will.
I suppose that would cause a fairly *splitting* headache
That part about needing to clean out the chicken coop is both hilarious and terrifying.
Best TIFO i've yet seen. 🏆
And i've seen many, many… TIFOs!
I had this surgery done about 15 years ago, had to get my right frontal lobe taken out as well. My neurosurgeon told me because that part was taken out the left side of my body would be a lot more weak than it was before. So I had to go through a lot of pt.
This was cool!
The optical chiasma is more tricky than you note: the right half of the field of vision from each eye is processed by the left brain, the left field of vision is processed by the right brain. To determine a distance to an object requires 2 inputs -- a determination resulting from parallax function in the brain. So 2 distance perceptions are needed to accomplish this.
More complication: the image perceived by each eye is upside down.
Simon's beard looking like it has a brain of its own.
I'd be curious how it works now when they remove part of the brain for like people who have really bad seizures. How does that work? I've heard that's what they do now.
the 1 dislike is Simon
he's his biggest critic.......
Or maybe someone finally paid attention to what he said and noticed he does zero to make sure his script is accurate. Mostly small mistakes
Here he said when showing a picture the right hand was able to identify it. But shown a picture the right hand was not. Immediately contradicting himself...how can people enjoy a fact show when he says the direct opposite of what he should be saying
@@jamesmeppler6375 hey, blame the fact boi and or his team. 10+ channels and hella recording/editing/coordinating just means it's bound to happen. Simon will either press down and work harder for consistency, or slowly lose relevance due to it. Eventually, it won't just be honest mistakes, but there's still great charm and entertainment to be had (from my perspective)
The brain is just as fascinating as knowing how horrifying experiments used do be.
Keeping the "alien hand" busy? Well, there's always the ol' trouser sausage to entertain... :P
🤣🤣🤣 this isn't Business Blaze
The cover image makes me think this is Business Blaze.. but it's Today I Found Out... The 2 most polarized versions of Simon in terms of professional behavior.
Yes! I did a quick click thinking it was BB!
There are instances of brains functioning properly without the corpus callosum in the Lac-Saint-Jean region of Quebec. There's been studies on the case. It's quite interesting to see how the brain can mutate and adapt.
One thing to clarify, the both eyes are connected to both sides, but the nerves are split down the center of the eye such that each hemisphere sees roughly half of the overall image. We literally see a composite of a separately created left and right image.
There are rare cases in which half of the brain is removed completely.
Jesus! Why!? 😱
Does the side of the ear change which hemisphere the noise is being registered by? Or are the ears interconnected? Could they be "learning" two things at once with two different headphones?
The one dislike was someones other half brain that didn't like this :)
All I know is that my brain hurts now! Thanks a lot Simon! 🤣
I REALLY liked this video. The question that I kept thinking about was...and I know there are very few of these patients, has any of the split brain patients figure out a way either purposely or not, to some sort of advantage? There seems like there would be a way, maybe with specific training or practice, to do two or more completely different tasks that a normal person could not do. I can't think of anything off the top of my head..but playing the piano comes to mind, where when I try my left hand wants to copy my right hand. Bad example I know...but surely have basically two brains that may or may not act independently has to have some advantage.
Thats actually a really good example and a super interesting way to think, I believe that they do havesome sort of advantage like you mentioned, I seen a comment someone who doesnt have that part of their brain where they said they can drown two different shapes at the exact same time, a square with one hand and a circle with the other
This is honestly fucking terrifying
I have so many question for a split brain person since I learned about this from CGPgrey’s video.
Fascinating! Regarding the left hand being more often the troublemaker, did you know the derivation of the word “sinister”? It comes from a Latin word meaning “on the left side, unlucky, inauspicious.” Interesting eh?
Actually information from the eyes is split, such that opposite visual fields are sent to the contra-lateral hemisphere.
The first of the "Blaze" thumbnail series!
I often find my hand grabbing another piece of candy even though Im almost nauseous from eating too much. Alien hand syndrome clearly.
With language centers on the left, the right consciousness can't communicate. It can hear what the left side consciousness is doing and can't interact outside of physical cues. Makes you wonder if the left arm lashing out is the pent up frustration of being stuck in this state.
I don't have access to my left side because of nurturing. I'm actually doing everything I can to stop thinking right and start thinking left. Do to my nurturing, I lost all faith in left brain activities and forced my logic side (the right) to take full control. From that information, I knew more about humans than ever before.
What is that instrumental in the background?
The split brain cases have always been super fascinating to me. I have a morbid curiosity to have it done for myself although I know that would never happen
Same. I really want to see what its like, but the operation cannot be reversed so no.
The fact boy returns
There are times I have looked at or thought of an object and couldn't remember the name but could describe what it looks like and what it's use is.. Could this be because there is something wrong with that connection?
The splitting headache comment was the patient making a joke. You repeating that ironically is awesome.
Thumbs on the video overall, but PLEASE have someone with a background in either neurology or neuroscience read your scripts to avoid confusing wording.
-The CP is NOT correcting some mistake made by the eyes sending signals to the wrong side of the brain. The primary visual info is going exactly where it is supposed to.
- It's not that each hemisphere of the brain receives info from ONLY the opposite eye directly. Each side of the (human) brain gets primary visual information from both eyes. What's happening is that each eye gets information from the opposite/contralateral Visual Field and this distinction is crucial b/c it has implications for foveate animals like us versus animals that lack binocular vision. Because we have binocular vision, there is a lot of overlap in the signal going to both sides of the brain from each eye. Compare that to something like a horse, with little binocular vision, and then most of the primary input is from the contralateral eye, and most of the visual info from the same side arrives across the CP.
Please see the diagram on the Wikipedia page for vision: en.wikipedia.org/wiki/Visual_system
Dude that’s insane
6:39 I always thought of myselfe as a "we". I used to think I was just thinking of an imaginary friend, because society taught me that. But as the image of that "friend" faded, I kept talking and thinking to myselfe, as if I had to explain stuff to me, even tho that means I already understood it. I even get annoyed, when I dont finish that sentence (I also mostly think in full sentences), even tho subconsciously I already know what I was gonna think or say, and often start over. Maybe im not as crazy as I thought, but just explaining stuff to my other half.
I’d love to see a video of those born without a Corpus Callosum.
I believe the movie Rainman was based on such an individual.