@shwillh The flashes are usually flashed tonotoptically. At less than 200ms. This is used to prevent involuntary saccades (eye movements), and well even more so, voluntary glancing.
It's really strange because there seems to still be plenty of coordination between the hemispheres. For example when he stands up, he needs to contract muscles in both his arms and both his legs. Which hemisphere of his brain made the decision to stand up? Let's say the left hemisphere makes the decision. But the left hemisphere controls only the right arm and right leg. How does the right hemisphere know to simultaneously contract his left arm muscles and his left leg muscles to allow him to stand up, otherwise he would stumble and be unable to stand? Especially considering the fact that he is not looking at his arms when he does this, so communication through external senses doesn't seem to be the case. When he walks, which side of the brain decides to do this? And how do both sides of the brain coordinate to allow him to walk? If they didn't coordinate he would either limp on one leg or he would fall over. Again he is not looking at his legs when he walks, so communication through external senses seems unlikely. It's really very confusing.
Wait , he saw music with his left speaking hemisphere that controls the right hand; and bell with his right not able to speak hemisphere that controls the left hand; how was he able to select the bell with the right hand controlled by the left that saw music and not bell ?
great question! I cite this research in my 2012 free book "Alchemy of Rainbow Heart" music - Only sometimes the right brain draws a composite of two different words - that had been seen by both the left and right brains. Each hemisphere on its own can integrate information while the left hemisphere uses words and the right hemisphere just listens and sees. The left hemisphere of the brain will lie - make up stories as false memories - about the right hemisphere of the brain when the right hemisphere perceives something that the left hemisphere can not. Michael S. Gazzaniga, “The Split Brain Revisited: Groundbreaking work that began more than a quarter of a century ago has led to ongoing insights about brain organization and consciousness” Scientific American, 2002
How do patients function? Like walk? listen to instructions ect? If the two halves are completely seperate from each other, how do they walk using both halves of their bodies?
Think of the two brain halves as two dance partners. When learning to dance together the two partners may need to talk to each other, but after years of practice they will move in perfect coordination just by sensing each other's movements.
yea but if the movement is conscious, then there must be a central or singular "will" to move them. I assume this will is the conglomerate of both brains normally. If the two brains are completely separate, as in no contact between them what so ever, then where does this "will" manifest from? in other words, what is telling the two halves to send signals to each leg? Its kind of like two workers operating independently: above them is the manager that tells each what to do, for a common goal. If the manager disappears, and there is no communication between the two workers, its just two workers doing unrelated tasks.
There are church bells ringing at the beginning (0:30) of the video... Joe's explanation of why he chose bells (for the experiment at 5:46) is actually completely accurate and plausible. I don't know if you could attribute it to the word flashing with any kind of certainty. Kind of funny that the video discredits itself for that particular example.
It's just a demonstration of how the left brain will logically deduce an answer - but in the context of the video with the experiment that demonstrates the sound of ringing bells is not the true origin of the word bell.
@@voidisyinyangvoidisyinyang885 this experiment seems a bit confusing, to me at least; he's pointing at the bell with his right hand, suggesting the choice of the left hemisphere (which is music); so the explanation seems to match; I don't get how the right hemisphere could have interfered with the left hemisphere process; anyway, mind-blowing video, and nice you replied to a 12 years old comment :)
@@bogdanpopescu1401 Hi - I need to rewatch the vid again but music as frequency is right brain dominant. Music as timing or rhythm is left brain dominant - also Musicians are more left-brain dominant in how they process music (since reading and comprehension is left brain dominant). The rhythm is actually the cerebellum and so that is a direct left to left correspondence. This can be shown by using the hands to tap a rhythm - as mentioned by Professor - he just passed on - Michael in Australia - names are left brain dominant but memory is right brain dominant. Carbone? No.... Michael Corballis. Close. OK - so if you try taping out a polyrhythm with your two hands you'll notice the left hand keeps a STEADY beat aka timing. So the timing is actually left brain dominant. This is also why learning a musical instrument before age nine shows a larger corpus callosum - a significant increase - but also increase on word processing ability (again an overlap in timing and left brain language dominance). Still if a person is blind then they can be more musically proficient - say Art Tatum - because pure frequency is right brain dominance. So they are not relying on processing left-brain dominant symbols as language to then convert it to right brain dominant frequency. Similarly a stroke can have a person retrain their speaking ability by SINGING first since if it's a left brain stroke - the word comprehension still exists in the right brain and singing as frequency is right brain dominant. A good book on this is "The Haunting Melody" by psychologist Reik - or this experiment: "We produced auditory analogs by presenting eight simultaneous and continuous sine waves to both ears and by either phaseshifting or frequency-shifting one of them relative to its counterpart in the opposite ear. Particular tones were shifted in sequence such that a melody was heard which was undetectable by either ear alone." So the phase shifting is timing but due to noncommutativity as the truth of music as phase shift of the Perfect Fifth as an undertone is actually a Perfect Fourth as an overtone (ironically the Perfect Fourth does not exist in Nature as a natural overtone but only as a wrongly assumed symmetric ratio of an octave of the Perfect Fifth undertone). See Fields Medal math professor Alain Connes lecture on youtube "Music of Shapes" for details. thanks
At 5:56 he pointed to the bell with his right hand which is controlled by the left part of his brain... but the right part did read the word bell so shouldn‘t he point with the left hand??
Indeed a mistake was probably made during the video editing. In the original study, he is asked to point at what he saw with his LEFT hand. After he pointed to the bell, the question is asked. The idea is that he sees himself pointing to the bell (and that information goes to both hemispheres). So when asked why he pointed to the bell, the left (speaking) hemisphere must interpret this action is some way. For the original study, see p.1318 of this article : Gazzaniga, M.S. (2000). Cerebral specialization and interhemispheric communication: Does the corpus callosum enable the human condition? Brain, 123, 1293-1326. In addition, look carefully and stop the video when he is pointing with the right hand, you will see that he is probably poiting to the trumpet (not the bell).
So...If we give this to 20 friends with one eye closed, and this to 20 friends with the other eye closed instead, and they aren't told that the pictures are faces made out of food in advance, do you think one group would see the faces and one group would not?
no because it only works when you focus on a point and it appears to the left or right of what you focus on, it doesn't have anything to do with the eyes
It only happens with split brain patients, not normal people. Your friends have the two parts of their brain connected, they both reach the same decision.
It feels like my brain is split watching this. I only get half the FPS I usually get.
I wish they interviewed him more, Im so curious how he'd describe what it feels like overall.
This is so fascinating. The brain is so adaptive, and what scientists know about it is very little compared to its complexities.
didn't expect Hawkeye to teach me about split brain patients, but I'm all for it. great video.
I know right? Pretty cool
@shwillh The flashes are usually flashed tonotoptically. At less than 200ms. This is used to prevent involuntary saccades (eye movements), and well even more so, voluntary glancing.
thanks for posting!
They should ask him to draw, with his left hand, a face with the emotion of his mood, or pick one out of a set of them.
It's really strange because there seems to still be plenty of coordination between the hemispheres. For example when he stands up, he needs to contract muscles in both his arms and both his legs. Which hemisphere of his brain made the decision to stand up? Let's say the left hemisphere makes the decision. But the left hemisphere controls only the right arm and right leg. How does the right hemisphere know to simultaneously contract his left arm muscles and his left leg muscles to allow him to stand up, otherwise he would stumble and be unable to stand? Especially considering the fact that he is not looking at his arms when he does this, so communication through external senses doesn't seem to be the case. When he walks, which side of the brain decides to do this? And how do both sides of the brain coordinate to allow him to walk? If they didn't coordinate he would either limp on one leg or he would fall over. Again he is not looking at his legs when he walks, so communication through external senses seems unlikely. It's really very confusing.
Don’t be afraid lil homie
this is soo fascinating
Wait , he saw music with his left speaking hemisphere that controls the right hand; and bell with his right not able to speak hemisphere that controls the left hand; how was he able to select the bell with the right hand controlled by the left that saw music and not bell ?
great question! I cite this research in my 2012 free book "Alchemy of Rainbow Heart" music - Only sometimes the right brain draws a composite of two different words - that had been seen by both the left and right brains. Each hemisphere on its own can integrate information while the left hemisphere uses words and the right hemisphere just listens and sees.
The left hemisphere of the brain will lie - make up stories as false memories - about the right hemisphere of the brain when the right hemisphere perceives something that the left hemisphere can not. Michael S. Gazzaniga, “The Split Brain Revisited: Groundbreaking work that began more than a quarter of a
century ago has led to ongoing insights about brain organization and consciousness” Scientific American, 2002
How do patients function? Like walk? listen to instructions ect? If the two halves are completely seperate from each other, how do they walk using both halves of their bodies?
Think of the two brain halves as two dance partners. When learning to dance together the two partners may need to talk to each other, but after years of practice they will move in perfect coordination just by sensing each other's movements.
yea but if the movement is conscious, then there must be a central or singular "will" to move them. I assume this will is the conglomerate of both brains normally. If the two brains are completely separate, as in no contact between them what so ever, then where does this "will" manifest from? in other words, what is telling the two halves to send signals to each leg? Its kind of like two workers operating independently: above them is the manager that tells each what to do, for a common goal. If the manager disappears, and there is no communication between the two workers, its just two workers doing unrelated tasks.
@@jackbowman7917 That's cute but I think the actual answer is that they get integrated in the cerebellum
Thumbs up if you came here from @cgpgrey
There are church bells ringing at the beginning (0:30) of the video... Joe's explanation of why he chose bells (for the experiment at 5:46) is actually completely accurate and plausible. I don't know if you could attribute it to the word flashing with any kind of certainty. Kind of funny that the video discredits itself for that particular example.
It's just a demonstration of how the left brain will logically deduce an answer - but in the context of the video with the experiment that demonstrates the sound of ringing bells is not the true origin of the word bell.
@@voidisyinyangvoidisyinyang885 this experiment seems a bit confusing, to me at least; he's pointing at the bell with his right hand, suggesting the choice of the left hemisphere (which is music); so the explanation seems to match; I don't get how the right hemisphere could have interfered with the left hemisphere process;
anyway, mind-blowing video, and nice you replied to a 12 years old comment :)
@@bogdanpopescu1401 Hi - I need to rewatch the vid again but music as frequency is right brain dominant. Music as timing or rhythm is left brain dominant - also Musicians are more left-brain dominant in how they process music (since reading and comprehension is left brain dominant). The rhythm is actually the cerebellum and so that is a direct left to left correspondence. This can be shown by using the hands to tap a rhythm - as mentioned by Professor - he just passed on - Michael in Australia - names are left brain dominant but memory is right brain dominant. Carbone? No.... Michael Corballis. Close. OK - so if you try taping out a polyrhythm with your two hands you'll notice the left hand keeps a STEADY beat aka timing. So the timing is actually left brain dominant. This is also why learning a musical instrument before age nine shows a larger corpus callosum - a significant increase - but also increase on word processing ability (again an overlap in timing and left brain language dominance).
Still if a person is blind then they can be more musically proficient - say Art Tatum - because pure frequency is right brain dominance. So they are not relying on processing left-brain dominant symbols as language to then convert it to right brain dominant frequency. Similarly a stroke can have a person retrain their speaking ability by SINGING first since if it's a left brain stroke - the word comprehension still exists in the right brain and singing as frequency is right brain dominant.
A good book on this is "The Haunting Melody" by psychologist Reik - or this experiment: "We produced auditory analogs by presenting eight simultaneous and continuous sine waves to both ears and by either phaseshifting or frequency-shifting one of them relative to its counterpart in the opposite ear. Particular tones were shifted in sequence such that a melody was heard which was undetectable by either ear alone." So the phase shifting is timing but due to noncommutativity as the truth of music as phase shift of the Perfect Fifth as an undertone is actually a Perfect Fourth as an overtone (ironically the Perfect Fourth does not exist in Nature as a natural overtone but only as a wrongly assumed symmetric ratio of an octave of the Perfect Fifth undertone). See Fields Medal math professor Alain Connes lecture on youtube "Music of Shapes" for details. thanks
At 5:56 he pointed to the bell with his right hand which is controlled by the left part of his brain... but the right part did read the word bell so shouldn‘t he point with the left hand??
You lost me at 🔔
Indeed a mistake was probably made during the video editing. In the original study, he is asked to point at what he saw with his LEFT hand. After he pointed to the bell, the question is asked. The idea is that he sees himself pointing to the bell (and that information goes to both hemispheres). So when asked why he pointed to the bell, the left (speaking) hemisphere must interpret this action is some way. For the original study, see p.1318 of this article : Gazzaniga, M.S. (2000). Cerebral specialization and interhemispheric communication: Does
the corpus callosum enable the human condition? Brain, 123, 1293-1326. In addition, look carefully and stop the video when he is pointing with the right hand, you will see that he is probably poiting to the trumpet (not the bell).
So...If we give this to 20 friends with one eye closed, and this to 20 friends with the other eye closed instead, and they aren't told that the pictures are faces made out of food in advance, do you think one group would see the faces and one group would not?
no because it only works when you focus on a point and it appears to the left or right of what you focus on, it doesn't have anything to do with the eyes
It only happens with split brain patients, not normal people. Your friends have the two parts of their brain connected, they both reach the same decision.
When was this filmed?
Alan Alda from mash?
yea
#PSYC101
Last stej बेल्टिलेट
Sir Bren present peless help
what about music? You know how only some music play in one ear? :P
That is called stereo sound as opposed to mono sound which sounds the same in both ears
Up jhansi
"recent" 12 years ago (sorry)
no such thing as extraox or what's x or not, any be anyx
🤓❤😎
Whose channel is this?