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Not only can synapses be created, destroyed, strengthened and weakened, but neurons themselves can be
taken over and reused. Neurons are not narrow specialists, but versatile workers that can switch job if
necessary. The brain is much more adaptable than we thought.
“The brain is much more adaptable
than we thought”
It is even opportunistic - if some nerve cells are not being used, they can be taken over and used for another
purpose, like finding your unused spare bedroom has been turned into a second kitchen when you were not
looking. This is known as COMPETITIVE NEUROPLASTICITY, and there are plenty of fascinating examples.
We know that blindness cause other sense like touch and hearing become more acute to compensate. This is
the result of synaptic neuroplasticity - hearing and touch are used more, so the connections are strengthened
and increase. Competitive neuroplasticity does more. Unused neurons are taken up used for other things.
When someone is blind, the part of the brain that normally process the input from eyes gets nothing. But it dose
not stay idle, It starts to PROCESS INPUTS FROM OTHER SENSE, such as touch and hearing.
“Climb Mount Everest”
Eric Weihenmayer has been blind from the age of thirteen. In 2001, he become the first blind
person to climb Mount Everest. He climbs with a grid of hundreds of tiny electrical impulse
which the tongue decodes into visual patterns of distance, shape and size. The information
dose not have to come from the eyes because we do not see with our eyes. WE SEE WITH
OUR BRAIN. It takes the inputs from the eyes and create what we experience as sight. The
brain can create pictures all by itself in the occipital lobe even WITHOUT EXTERNAL
INPUT and project them outwards as hallucinations
The same process applies to hearing; the brain create what we experience as sound decoding
the input from the ears. It can also produce auditory hallucinations in the temporal lobe. WE
FEEL WITH OUR BRAIN. It decodes the touch sensations from our skin. We can also have
touch hallucinations - feeling something that is not there. Stimulating cells in the motor cortex
of brain cause the person to feel the sensation in the corresponding part of body.
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