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The idea that we only use 10 percent of our brains may turn out
to be a myth, as roughly 80 percent of our cognitive power may be
working on tasks we are completely unaware of.
According to scientists who have conducted studies using ferrets,
this hidden activity may only exist in older brains, as they may
occur due to the subconscious reprocessing of initial thoughts and
experiences. In addition, studies proved that neural patterns in
adult ferrets correlated well with images viewed, while in very
young ferrets a correlation did not exist. Thus, scientists concluded
that understanding vision might be a different task for young brains
as opposed to old ones.
Scientists found that when placed in a completely dark room, free
of any visual stimulation, older ferrets’ brains continued
to run at 80 percent. It was discovered that while watching the
movie, ferrets’ neuron activity was increased by 20 percent.
This suggests that even with eyes closed, human adults’ brains
are running at 80 percent, and in opening their eyes, including
the additional 20 percent.
Scientists were intrigued to find that the ferrets’ brains
were processing even though there was no image there to process.
The research was then aimed at figuring out if there was any connection
between visual processing and real-world images. The experiment
involved the film “The Matrix” and 12 ferrets. Scientists
hoped to uncover whether there was indeed a relationship between
the statistical motion seen in the film and the way visual neurons
in the ferrets fired.
During the study scientists recorded how
the ferrets’ brains responded to the film, enlarged television
static and a darkened room. They found that:
- Each visual neuron in the brain is keyed to respond to certain
visual elements (for example, a vertical line)
- The combined neurons process an image of many lines, colors
etc.
- Scientists were able to see a match between the ferrets’
response to the film and the actual visual aspects of the film
The study showed that although the adult ferrets seemed to respond
similarly to what was happening in the film, younger ferrets formed
almost no relationship. Consequently, younger ferrets could not
process the stimuli in a way that reflects reality.
To explain the disordered processing that occurs in the young brains,
scientists refer to dyslexia as a comparison, in that infants could
very well see the world as a mass of dissimilar scenes and sounds.
Further, scientists were able to gain a deeper insight on the processing
going on within the brain because the subjects tested were awake
and conscious.
Science
Daily October 13, 2004
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