36084Y Many Breakthroughs In Understanding .......

Q
THE RELATIONS
BETWEEN THE TWO HEMISPHERES
WERE BASED ON THE STUDY OF EPILEPSY PATIENTS.
In severe cases of epilepsy, electrical storms begin in one part of the brain
but quickly spread to other parts, causing e very acute seizure. During such seizures
patients lose control of their bodies, and frequent seizures consequently preclude them
from holding jobs or leading normal lives. In the mid 20th century, when all other treatments
failed, doctors alleviated the problem by cutting the thick neural cable connecting the two hemispheres,
so that electrical storms beginning in one hemisphere could not spill over to the other. For brain scientists
these patients were a goldmine of astounding data! Some of the most notable studies on these split-brain
patients were conducted by Professor Roger Wolcott Sperry, who won the 1981 Nobel Prize in Physiology &
Medicine for his groundbreaking discoveries, and by his student, Professor Michael S. Gazzaniga. One study
was conducted on a teenage boy. The boy was asked what he would like to do when he grew up. The boy
answered: be a draughtsman. This answer was provided by his left hemi-sphere, which plays a crucial part
in logical reasoning as well as in speech. Yet the boy had another active speech centre in his right hemi-
sphere, which could not control vocal language but could spell words by using Scrabble tiles.
The researchers were keen to know what the right hemisphere would say. So they spread
Scrabble tiles on a table, and wrote on a piece of paper: 'What would you
like to do when you grow up?' They placed the paper at the edge
of the boy's left visual field. Data from the left visual field
is processed in the right hemisphere. Since the right
hemisphere could not use vocal language,
the boy said nothing. But his left
hand began moving rapidly
across the table, collecting
tiles from here to there,
until it spelled out:
'automobile race'!
Spooky?
03 okt 2019 - bewerkt op 07 okt 2019 - meld ongepast verhaal
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