Severed Corpus Callosum

[Kawaiibabygurl911]

Scroll up! You're missing the video!

[MissJamMania]

don't go out without your left hemisphere ...hmm,,,this line can be said to debate opponents.

[yamstimes3]

Get your whole class to synch the video so that you are all at the same exact part.

[SmileForJJ]

Anyone remember the name of this TV series?

[Psythik]

Honestly I rather stay an epileptic than have my brain fucked with...

[Nekiroa]

@Psythik you say that because you are not epileptic... but... patients that have a severe enough case of epilepsy to be considered for a split-brain procedure are literally debilitated by their neural disorder. There is no ability to function in every day life... those patients can have constant seizures all day... with no maximum number of seizures a day or maximum time extent of said seizures.

[Maniuszka1]

@Psythik are you an epilepyic? If you are and you have opinion like that than probably you have only petit mal seizures. Seizures all day without yoy control. Damn, my english isn't enough good to espress what i want to said -.- i'm 24 and doctors diagnosed epilepsy when I was 6. I have petit mal seizures but even that complicated sometime my life. I can't imagine life with f.e. tonic clonic seizures as often as in 'bad days' I have my

[leenybeeny65]

Honestly, drawing a circle with one hand and a square with the other is impossible to us mere mortals with one whole brain.

[zasxaqws]

Psych lecture! Very interesting!

[lavenderqueenliz1]

My professor (Cognitive Psychology) showed this video on September 25, 2011, but not the intro, so I am happy I found this so I can go over whatever I missed!

[TheKerri1978]

Really how safe is this surgery

[Nekiroa]

@TheKerri1978 obviously safe enough to be considered medically superior even in 2012 (considering this video must be from the early 90's?)

[mightyhoyer07]

Alan Alda is narrating this video...I wish he narrated my life...

[87mrks]

our brains are truly facinating

[onelostpoetssoul]

Pinky and the brain

[Blondunka]

Alan Alda is the best part of this video

[movingtargett]

thats why youtube videos are slightly offset to the right?

[thesaraheffect]

HAWKEYE!!!

[Tjmomma2]

7 people are failing psych

[ReconOne123456789]

OUCH! MY BRAIN!

[gr8tosk8]

I have a more than 50 point difference between my left and right side.....I was told I should not be functioning.....and the team that did the 4 day test on me....well....F-them! just need someone to tell me what I can do!!! Yes I can do some off the wall things with my right and left side.....at the same time! and I am left with an IQ of about 129! And I have a crazy desire to paint things and have ......first try with water color I was asked permssion from teacher to publish....lol

[xxstormxangelxx]

we saw this in my psych class :)

[sweetgirlstonecol316]

Helpful video. It was the guy from M.A.S.H., that Alan guy.

[mrosters]

7 people need their brains severed.

[davetronred]

Why is Hawkeye telling me about brains? I'm so confused.

[DollProductions1]

This is facinating. The brain is really amazing.

[14boogie]

I'm taking General Psych. online and this video was reccomended. Loved it, thanks for posting.

[Z3uS2]

This is remarkable. The human brain really is fantastic.

[AlephNeil]

I think the most remarkable effect here is the way he confabulates an explanation for why he picked 'bell'. Naively, you'd think he would say "actually, I don't know why my left hand pointed to the bell - I wanted to point at the trumpets." I mean, it's just an experiment so he has no incentive to try to 'disingenuously' pretend to be 'normal'.

Shows that what's going on isn't as simple as having "two minds in the same brain".

[Spetsop]

@AlephNeil

The thing is that consciously he doesn't know that he saw the word "bell", but he knows that the word "music" was there. So there is a need for the brain to tie the two together. Once the connection is established, he then consciously knows why he pointed at bell. I wonder what he would have pointed at, and what his explanation would have been, if he used his left hand instead.

[Spetsop]

@AlephNeil

There is an interesting concept that occurs when the right hemisphere becomes more active than the left, it's called the sensed presence. The left hemisphere (or the dominant one) is the linguistic one, it explains the sense of self, while the right hemi. works sort of in the shadow of the left. The two are in phase with each other, but sometiems they might go out of phase. Since there can only be one self within a person, the right hemi. is experienced as an external presence.

[MrKevMan]

I hoped he had gained super powers.

Thing is, there is an overlap for your field of vision. You see things to the left of you with your right eye. Not well, but you still see it. Interesting.

[HelioMaia]

Why not use an eyepatch instead of flashing images?

[eswyatt]

@HelioMaia Because it it the right halves of the field of vision of both eyes that report to the left side of the brain, and the left halves of the field of vision of both eyes that report to the right side of the brain. A common misconception is that the right eye is connected to the left side of the brain etc. So even with one eye covered, he could pan with one eye and "cheat" so to speak by getting the image to both sides of the brain. The trick was keeping both eyes on the "X".

[equallyeasilyfuqyou]

i'm a drummer and i want this done to me. :D

[SpairoAce]

@equallyeasilyfuqyou i vote up to that. i am too lol

[zacmienieorg]

If while drawing "Toadstool" his left hemisphere sees "Toad" and right hemisphere sees "Stool", how come he is able to draw both words with his single arm? If there is no connection between the hemispheres, he should be able to draw only one of these words (namely, the one on the right).

[zacmienieorg]

Ok, so I missed the part "Joe's speaking left brain saw "stool". Saying the word lets his right-brain-controlled hand in on the secret."

But wasn't the right hemisphere supposedly unable to understand language?

[falwyn]

@zacmienieorg Is it unable to understand language, or just unable to use/produce it? It must be able to understand, because he was reading the words on that side as well... church and phone for instance.

[eswyatt]

@falwyn I knew a guy who lost his ability to talk because of a stroke. When he wanted something, he'd indicate by groaning, grunting etc. We'd have to give him a "menu" of options--turn the heat up? change the channel on the tv?--and he'd nod when we hit the right one. So what you suggest sounds plausible.

[eswyatt]

@zacmienieorg That's a good question. I thought of that when I was answering another person's question. I wish someone would provide the answer.

[Spetsop]

@eswyatt @zacmienieorg

Well language is primarily localized in the left hemisphere (or the dominant hemisphere, small % of the population has it in the right hemi.), but the right hemisphere is still able to understand simple words. Another interesting property of the right hemisphere is that it's able to understand more complex sentences if they are sang to the person. Notice this, listen to a foreign singer when they are singing and compare their accent to when they are simply talking.

[Spetsop]

@eswyatt @zacmienieorg

[cont.] I bet you will notice a clear difference in their accents, meaning that when they talk they have a thick accent but when they sing you most likely won't be able to detect their accent at all. This is, once again, due to the fact that during singing the right hemisphere is more active than the left.

In people with a cut corpus callosum there still exist some communication b/w the hemispheres, by way of anterior and posterior commissures for example.

[Spetsop]

@eswyatt @zacmienieorg

[cont.] So even though the majority of the connections are lost, some still exist, and that could be the reason why the person is still aware of at least some aspects of language with their right hemisphere (although, as I said, right hemi. also has some ability to understand and reproduce simple language).

To the video: this is BY FAR the most interesting video I have seen on Youtube to date!!! Wish there were more videos like this one.

[eswyatt]

@Spetsop Thanks Spetsop!

[Spetsop]

@eswyatt

You're welcome :)

[eswyatt]

@zacmienieorg Because he spoke the word, which both sides of the brain heard.

[AnimeExecutive]

@zacmienieorg he says stool making the right brain hear it (it can hear but cant read) so hi right brain thinks of stool then draws it then his left merges them together making toad stool

[JoshRosenblumMusic]

1:51 - He totally draws a penis

[TheScottishlover]

MY Fav psyc video ever

[xKissMyMakeupx]

great video. very insightful. the brain is the most amazing machine on the planet.

[Katalyzt]

★★★★★

[tromboneman45]

This guy could play Pictionary with himself!!

[bonehead156]

dude watched this in psychology class today. its pretty damn amazing!

[Rycr]

We touched upon this case in my Psych class the other day. Personally, I find it amazing that he can function relatively normally despite having two separate brain hemispheres that don't communicate with each other whatsoever. Just goes to show how adaptable the human mind is...

[JevrioGA]

He has Core 2 Duo :O

[DJMedlee]

He looks and sounds like that guy from M.A.S.H.

[hpmgew]

@DJMedlee It is the guy from M.A.S.H. His name is Alan Alda.

[plaidmoose]

@DJMedlee I'm about 95% sure it's him... His voice sounds too much like hawkeye's that it's gatta be him. I think I was the only one in my psychology class that noticed that right off the bat. Probably because most people nowadays don't even know that an awesome like M.A.S.H. existed. But I digress.

[jonesgerard]

@plaidmoose hehe my dad used to say they spelled that program backwards.

SHAM.

Never quite got it myself either, I grew up on a diet of monty python, I was ruined early on.

[questionmark14]

So this is Gazzaniga and his later research. I saw his older resaerch. His experiments are so interesting

[1RadicalOne]

Is the narrator and host the one who played "Lester" from Crimes and Misdemeanors? He looks and sounds familiar, most like the character I mentioned above.

[bananian]

@1RadicalOne

I'm sure he's the surgeon from MASH

[1RadicalOne]

I do not know what that is.

[bananian]

@1RadicalOne

The heart is made up of four cavities that holds the blood before the blood gets pumped out.

[bananian]

@1RadicalOne

Oh sorry, you meant the show MASH. It's an old comedy show about surgeons in Vietnam.

[1RadicalOne]

I see.

Could you please remove the other misdirected comment? It makes me look foolish.

[Myer58]

So with someone with a disease like (CHSP) Complicated hereditary spastic paraplegia with a thinning corpus callosum would a surgical procedure to severe the corpus callosum help at all?

[Jakoffasaure]

I saw this in my psych class 2 day...

[treyzure]

go uc davis! i saw this in psych 1

[pt2091]

Rofl why did you list this video in Sports?

Also, the description is misleading.

Good video nonetheless.

[Lban2]

ohh thankss ... i can do my hw too !

[FarazSMusic]

i dont understand this part: if BELL goes to his right brain, then he should point to the BELL by his left hand, but why does he point to the BELL by his right hand. His left speaking brain which controls his right hand got MUSIC and NOT BELL. The fact that he may have spoken it out would reinforce pointing to music not to bell, since the right brain does not speak !! right ?

[dirtyharree]

orrite, so we know this happens, but why would the brain evolve to be split? Why not have just one big blob doin everything? Would really appreciate if anyone could xplain!

[visualpurple123]

If you're asking if the brain is lateralized, we talked about this in my psych class- it could be that one very important function became lateralized then many others followed (most likely language to the L hemisphere), or that there is a processing advantage to having two brains doing two different types of processing on the same task simultaneously (R spatial and L verbal). It could also help keep the different functions from interfering with each other (insulate them). Hope that helps!

[thomasford]

Bilateral symmetry. Same thing that makes you have two eyes and such.

[dirtyharree]

hmm...so y not have two hearts, stomachs, pancreas etc! Also why not have trilateral symmetry altogether? Guess I'm splittin hairs here, but hell, why not!

[thomasford]

Eh. Just an educated guess. Some things we got two of and some things we got one of. We have two lungs, but one heart, etc. As to "why not trilateral symmetry" and such, well, there are animals out there with different symmetries, such as radial symmetry.

[dirtyharree]

one heart is god's hint to be monogamous!

[bananian]

@dirtyharree

actually, the heart has two pairs of chambers.

[itzoUSA]

This video was presented in my Psychology Lecture at City College of New York! So I pay for college to information that is already on Internet for free!!! Internet replaces the information you can get in college today. College is overrated!

[1trayc]

love thiss! i can do my homework now

[BenShieIds]

i did that shit easily

[artistcaleb]

Odd that the man with a severed corpus callosum would draw the circle with his left hand, and a square with his right (corresponding with the images on the screen), when the left hand is controlled by his right hemisphere and vice-versa. He must be very practiced.

[khosterman]

Don't forget that his left eye is also controlled by his right brain. His left hand draws what his left eye saw.

[artistcaleb]

Ah I see. Perhaps the cerebellum helps to keep any inharmonic duality at bay a bit too.

[visualpurple123]

Not his left eye, his left visual field. Both eyes give input to both hemispheres- the left visual field for BOTH eyes goes to the R hemisphere and the R visual field for both eyes goes to the L hemisphere. The way they're presenting stimuli here (tachistoscopically) prevents the eyes from moving (they're fixated on the cross) because it presents info so quickly. In that way, anything to the L of the X goes to the R hemisphere because it's the L visual field (in BOTH eyes) and vice versa.

[jmabee77]

youre an idiot. the circle is on the left side of his center of vision, which is controlled by the right side of his brain. His right hemisphere controls the left hand as well.

[artistcaleb]

I figured I was an idiot, but wasn't quite sure. Your reply simply affirms that for me, and so much more makes sense in life now. I wish I had known this earlier. Thank you !

[artistcaleb]

Oops, yeah I'm a tard, the guy is doing it the way one would in that state. never mind

[fornello123]

right > left

[Patriknark]

@fornello:

so you enjoy not being able to speak and think logically. cool ;)

[caseyDsutherland]

alan alda!

[walkertron5000]

I loved this series!.. Too bad they stopped making episodes..

[civilsoldier327]

This video was shown in my college Psychology. IT IS LEGIT!! Trust me. It's a real occurrence and the explain it very well. BELIEVE IT

[hpmgew]

@civilsoldier327 I saw this is my Intro Psych class too! It is one of those classic videos that they show. Like you said, it is real. I really like interesting videos like these. Our bodies and brains are so interesting and amazing.

[SkillerGuyVids]

Everyone, i swear on the holy bible this is true.

My mom has a severed corpus whatever. She has been fasting and her brain is split in two. Doctors say she is going to make medical history..Don't beleive me? See you on Nancy Grace! :D

[jemaya123]

The brain is very powerful. I am very interested in the brain because any alteration done to it will change your whole being. Being in the fact that your behaviors, styles and even your perception to things will change.

The only note that we have to take in is, we should take care of these two hemispheres because even though there are two without the other one its like brain death. NADA! They are both important

! Be Brain Healthy!

[Groudie101]

this is amazing!! our brain does everything for us! we don't actually feel or smell.Our brain gives us an idea of what pain and a cetain smell is like.I guess there is some truth to the saying that perception is reality

[ourben]

No, it is exactly the opposite truth.

[Groudie101]

I have scientific evidence to back up what I have to say.Where is yours?

[ourben]

Hallucinations don't really happen then... it is actually real?

[Groudie101]

Hallucinations are created by the brain.Your brian interpets everything for you.If I stick you with a pin receptor cells picks it up,sends it to your brain,your brian give you an idea of what the pain feels like..(indicating you should move).That's why when someone spinal cord is damaged they don't feel pain.

[ourben]

Sorry, I think part of your message got transmogrified in transit... how on earth does what you said reinforce the tenet perception equals reality?

[jch31384]

i wonder, since most musical instruments use both hands either to perform two tasks(fretting with one, strumming with other or play two different parts (melody and rhythm on a piano) would having your corpus callosum cut potentially make you a better or worse musician?

[vikingmetal99]

your two hands would not be able to coordinate with each other to physically play a musical instrument. When the corpus callosum is severed, you are barely able to coordinate lighting a match to a matchbox

[mindhypnotized]

Yeah, that's not true. The guy in the video drove a truck and was lifting boxes in the beginning of the video. Commissurotomies don't effect day-to-day activities much at all. The split-brain symptoms pretty much only show up in laboratory settings. Lighting a matchbox would be easy as it always was. A musical instrument might be a different story, though, since the the right hemisphere is thought to be dominant in artistic abilities. So maybe left-handed instruments would be all right lol

[Hankybro21]

In addition to facial recognition in the RH, his RH is seeing the pictures of faces as a whole, a novel gestalt, whereas his left is able to break down the overlearned components of it (e.g., books, fruit)...gotta love it

[pookie052606]

God, Psych is so intriguing!

[pepsimeblu]

Thanks for this. The my prof what this video but lost it, but fortunately someone is the class found this video and sent it to the class.

Thanks again :)

[WeAreBullets]

i saw this in psychology class in high school, now im reading about it again in college. its nice that its on youtube. thanks. very interesting stuff.

[neostryke]

This is a great video, thanks for the upload.