Myths about the
Brain
The brain is one of the most amazing organs
in the human body. It controls our central nervous system,
keeping us walking, talking, breathing and thinking. The brain
is also incredibly complex, comprising around 100 billion
neurons. There's so much going on with the brain that there
are several different fields of medicine and science devoted
to treating and studying it, including neurology, psychology,
and psychiatry. These disciplines have been around in some
form since ancient times, so you'd think that by now we'd know
all there is to know about the brain. Nothing could be further
from the truth. After thousands of years of studying and
treating every aspect of it, there are still many facets of
the brain that remain mysterious. All this confusion and lack
of understanding over the centuries has led to some common
myths about the brain that simply are not
true...
1) You Only Use 10 Percent of Your
Brain
We've often been told that we only use about
10 percent of our brains. Famous people such as Albert
Einstein and Margaret Mead have been quoted as stating a
variation of it. This is probably one of the most well-known
myths about the brain, in part because it's been publicized in
the media for what seems like forever. Here's the thing,
though; it's not really true. In addition to those 100 billion
neurons, the brain is also full of other types of cells that
are continually in use. We can become disabled from damage to
just small areas of the brain depending on where it's located,
so there's no way that we could function with only 10 percent
of our brain in use. Brain scans have shown that no matter
what we're doing, our brains are always active. Some areas are
more active at any one time than others, but unless we have
brain damage, there is no one part of the brain that is
absolutely not functioning.
2) Alcohol Kills
Brain Cells
Just one observation of a drunken person is
enough to convince you that alcohol directly affects the
brain. People who drink enough to get drunk often end up with
slurred speech and impaired motor skills and judgment, among
other side effects. But are a few drinks on the weekend, or
even the occasional long drinking session, enough to kill
brain cells? Not so much. Even in alcoholics, alcohol use
doesn't actually result in the death of brain cells. It can,
however, damage the ends of neurons, which are called
dendrites. This results in problems conveying messages between
the neurons. The cell itself isn't damaged, but the way that
it communicates with others is altered. According to
researchers such as Roberta J. Pentney, professor of anatomy
and cell biology at the University at Buffalo, this damage is
mostly reversible.
3) You Can Learn Through
Subliminal Messages
The concept of subliminal messages feeds
into our suspicions about what the government, big
corporations and media are really trying to tell us. A
subliminal message is a message embedded into images or sound
meant to penetrate into our subconscious and influence our
behaviour. The first person to coin the term was James
Vicary,
a market researcher. In 1957, Vicary stated that he inserted
messages into a showing of a movie in New Jersey. The
messages, which flashed for 1/3000th of a second, told
moviegoers to drink Coca-Cola and eat popcorn. According to
Vicary, Coke sales in the theater increased by more than 18
percent and popcorn sales by more than 57 percent, proving
that his subliminal messages worked. But did the messages
work? Turns out, Vicary actually lied about the results of his
study. Subsequent studies, including one which flashed the
message "Call now" during a broadcast on a Canadian TV
station, had no effect on viewers.
4) Listening
to Mozart Makes You Smarter
Don't you just feel cultured when you tune
in to a classical music station and take in an opera or a
symphony by a great composer like Mozart? Baby Einstein, a
company that makes DVDs, videos and other products for babies
and toddlers incorporating classical art, music, and poetry,
is a million-dollar franchise. Parents buy the products
because they believe that exposure to great art (like Baby
Mozart DVDs and CDs) can be good for their children's
cognitive development. There are even classical music CDs
designed to be played to developing fetuses. The idea that
listening to classical music can increase your brainpower has
become so popular that it's been dubbed "the Mozart effect."
Mozart certainly can't hurt you, and you might even enjoy it
if you give it a try, but you won't get any
smarter.
5) Your Brain Stays Active After You Get
Decapitated
The guillotine came about because of the
desire for a quick, relatively humane death. But how quick is
it? If your head were cut off, would you still be able to see
or otherwise move it, even for just a few seconds? On July 17,
1793, a woman named Charlotte Corday was executed by
guillotine for the assassination of Jean-Paul Marat, a radical
journalist. After the blade dropped and Corday's head fell,
one of the executioner's assistants picked it up and slapped
its cheek. According to witnesses, Corday's eyes turned to
look at the man and her face changed to an expression of
indignation. This story seems to give credence to the idea
that it's possible for someone to remain conscious, even for
just a few seconds, after being beheaded. However, most modern
physicians believe that the reactions described above are
actually reflexive twitching of muscles, rather than
conscious, deliberate movement. Cut off from the heart (and
therefore, from oxygen), the brain immediately goes into a
coma
6) The Human Brain Is the Biggest
Brain
Many animals can use their brains to do some
of the things that humans can do, such as finding creative
ways to solve problems, exhibiting self-awareness, showing
empathy toward others and learning how to use tools. But
although scientists can't agree on a single definition of what
makes a person intelligent, they do generally agree that
humans are the most intelligent creatures on Earth. In our
"bigger is better" society, many people foolishly believe that
humans have the biggest brains of all animals, because we're
the smartest. Well, not exactly. The average adult human brain
weighs about 3 pounds (1,361 grams). The dolphin -- a very
intelligent animal -- also has a brain that weighs about 3
pounds on average. But a sperm whale, not generally considered
to be as intelligent as a dolphin, has a brain that weighs
about 17 pounds (7,800 grams). On the small end of the scale,
a beagle's brain is about 2.5 ounces (72 grams), and an
orangutan's brain is about 13 ounces (370
grams).
7) Brain Damage Is Always
Permanent
Brain damage is an extremely scary thing.
For something so mysterious and amazing, the brain can
actually be quite fragile and susceptible to a multitude of
injuries. Brain damage can be caused by anything from an
infection to a car accident, and it essentially means the
death of brain cells. There are many different types of brain
damage, and exactly how it will affect someone depends largely
on its location and how severe it is. A mild brain injury,
such as aconcussion, usually occurs when the brain bounces
around inside the skull, resulting in bleeding and tearing.
The brain can recover from minor injuries remarkably well; the
vast majority of people who experience a mild brain injury
don't experience permanent disability.
8) You Can
Get Holes in Your Brain Through Drug Use
Exactly how different drugs affect your
brain is a pretty controversial subject. Some people claim
that only the most severe drug use can have any lasting
effects, while others believe that the first time you use a
drug, you're causing long-term damage. In truth, the only
thing that can actually put a hole in your brain is physical
trauma to it. Researchers do claim that drugs can cause
short-term and long-term changes in the brain. For example,
drug use can lower the impact of neurotransmitters (chemicals
used to communicate signals in the brain) like dopamine, which
is why addicts need more and more of the drug to achieve the
same feeling. In addition, changes in the levels of
neurotransmitters can result in problems with neuron function.
Whether this is reversible or not is also up for debate. But
although the jury's still out on exactly how different drugs
can affect your brain for the long term, we can be reasonably
sure of one thing: No drug actually puts holes in your
brain.
9) Your Brain Is Grey
Have
you given any thought to the colour of
your brain? Maybe not, unless you work in the medical
field.
We have all colours of the rainbow in our bodies in
the form
of blood, tissue, bone and other fluids. But you may
have seen
preserved brains sitting in jars in a classroom or on
TV. Most
of the time, those brains are a uniform white, grey or
even
yellowish hue. In actuality, though, the living,
pulsing brain
currently residing in your skull isn't just a dull,
bland grey; it's also white, black and red. Like many myths about
the brain, this one has a grain of truth, because much
of the
brain is grey. Sometimes the entire brain is referred
to as
grey matter. However, the brain also contains white
matter,
which comprises nerve fibres that connect the grey
matter. The
black component is called substantia nigra. It's black
because
of neuromelanin, a specialized type of the same
pigment that
colours skin and hair, and it's a part of the basal
ganglia.
10) You Get Brain Wrinkles When You
Learn Something New
As humans evolved as a species, our brains
grew larger to accommodate all of the higher functions that
set us apart from other animals. But in order to keep the
brain compact enough to fit into a skull that would actually
be in proportion with the rest of our body size, the brain
folded in on itself as it grew. If we unfolded all of those
ridges and crevices, the brain would be the size of a
pillowcase. The ridges are called gyri and the crevices are
called sulci. We don't start out with wrinkly brains, however;
a fetus early in its development has a very smooth little
brain. As the fetus grows, its neurons also grow and migrate
to different areas of the brain, creating the sulci and gyri.
By the time it reaches 40 weeks, its brain is as wrinkled as
yours is (albeit smaller, of course). So we don't develop new
wrinkles as we learn. The wrinkles we're born with are the
wrinkles we have for life.