Video - Karen Byrne's split brains have independent minds of their own.
BBCNews | Karen's problem was caused by a power struggle going on inside her head. A normal brain consists of two hemispheres which communicate with each other via the corpus callosum.
The left hemisphere, which controls the right arm and leg, tends to be where language skills reside. The right hemisphere, which controls the left arm and leg, is largely responsible for spatial awareness and recognising patterns.
Usually the more analytical left hemisphere dominates, having the final say in the actions we perform.
The discovery of hemispherical dominance has its roots in the 1940s, when surgeons first decided to treat epilepsy by cutting the corpus callosum. After they had recovered, the patients appeared normal. But in psychology circles they became legends.
That is because these patients would, in time, reveal something that to me is truly astonishing - the two halves of our brains each contain a kind of separate consciousness. Each hemisphere is capable of its own independent will.
Brain experiments
The man who did many of the experiments that first proved this was neurobiologist, Roger Sperry.
In a particularly striking experiment, which he filmed, we can watch one of the split brain patients trying to solve a puzzle. The puzzle required rearranging blocks so they matched the pattern on a picture.
First the man tried solving it with his left hand (controlled by the right hemisphere), and that hand was pretty good at it.
Then Sperry asked the patient to use his right hand (controlled by the left hemisphere). And this hand clearly did not have a clue what to do. So the left hand tried to help, but the right hand did not want help, so they ended up fighting like two young children.
Experiments like this led Sperry to conclude that "each hemisphere is a conscious system in its own right, perceiving, thinking, remembering, reasoning, willing, and emoting".
In 1981 Sperry received a Nobel prize for his work.
BBCNews | Karen's problem was caused by a power struggle going on inside her head. A normal brain consists of two hemispheres which communicate with each other via the corpus callosum.
The left hemisphere, which controls the right arm and leg, tends to be where language skills reside. The right hemisphere, which controls the left arm and leg, is largely responsible for spatial awareness and recognising patterns.
Usually the more analytical left hemisphere dominates, having the final say in the actions we perform.
The discovery of hemispherical dominance has its roots in the 1940s, when surgeons first decided to treat epilepsy by cutting the corpus callosum. After they had recovered, the patients appeared normal. But in psychology circles they became legends.
That is because these patients would, in time, reveal something that to me is truly astonishing - the two halves of our brains each contain a kind of separate consciousness. Each hemisphere is capable of its own independent will.
Brain experiments
The man who did many of the experiments that first proved this was neurobiologist, Roger Sperry.
In a particularly striking experiment, which he filmed, we can watch one of the split brain patients trying to solve a puzzle. The puzzle required rearranging blocks so they matched the pattern on a picture.
First the man tried solving it with his left hand (controlled by the right hemisphere), and that hand was pretty good at it.
Then Sperry asked the patient to use his right hand (controlled by the left hemisphere). And this hand clearly did not have a clue what to do. So the left hand tried to help, but the right hand did not want help, so they ended up fighting like two young children.
Experiments like this led Sperry to conclude that "each hemisphere is a conscious system in its own right, perceiving, thinking, remembering, reasoning, willing, and emoting".
In 1981 Sperry received a Nobel prize for his work.
1 comments:
or maybe IT just likes heights and adrenaline...,
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