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 Topic: 10 Things You Didn't Know About the Brain

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  • 10 Things You Didn't Know About the Brain
     OP - May 11, 2010, 07:36 PM
    Found an interesting article on the human brain... thought I'd share it here. (Made the font a big bigger as the pics are pretty big and were overshadowing the text).


    Source: http://www.livescience.com/health/brain-facts-1op10-100417-1.html


    10 Things You Didn't Know About the Brain

    10:


    Human brains are big...

    The average adult brain weighs just under 3 pounds (between 1.3 and 1.4 kilograms). Some neurosurgeons describe the texture of a living brain as that of toothpaste, but according to neurosurgeon Katrina Firlik, a better analogy can be found in the local health-food store.

    "[The brain] doesn't spread like toothpaste. It doesn't adhere to your fingers the way toothpaste does," Firlik writes in her memoir, "Another Day in the Frontal Lobe: A Brain Surgeon Exposes Life on the Inside" (Random House, 2006). "Tofu -- the soft variety, if you know tofu -- may be a more accurate comparison."

    If you aren't charmed by that description, consider this: About 80 percent of the contents of your cranium is brain, while equal amounts of blood and cerebrospinal fluid, the clear liquid that buffers neural tissue, make up the rest. If you were to blend up all of that brain, blood and fluid, it would come to about 1.7 liters, or not quite enough to fill a 2-liter soda bottle.


    9:


    ...But they're getting smaller

    Don't get too cocky about your soda-bottle-sized brain. Humans 5,000 years ago had brains that were even larger.

    "We do know from archaeological data that pretty much everywhere we can measure -- Europe, China, South Africa, Australia -- that brains have shrunk about 9 cubic inches (150 cubic centimeters), from an average of about 82 in^3 (1,350 cm^3). That's roughly 10 percent," University of Wisconsin at Madison paleoanthropologist John Hawks told LiveScience in 2009.

    Researchers don't know why brains might be shrinking, but some theorize that they're evolving to be more efficient. Others think our skulls are getting smaller because our diets include more easily chewable foods and so large, strong jaws are no longer required.

    Whatever the reason, brain size doesn't directly correlate with intellect, so there's no evidence that ancient man was brainier than humans of today.


    8:


    Our brains burn through energy

    The modern brain is an energy hog. The organ accounts for about 2 percent of body weight, but it uses about 20 percent of the oxygen in our blood and 25 percent of the glucose (sugars) circulating in our bloodstream, according to the American College of Neuropsychopharmacology.

    These energy requirements have spurred a debate among anthropologists about what fueled the evolution of big brains in the first place. Many researchers credit meat, citing evidence of hunting in our early ancestors. But meat would have been an unreliable food source, say other scientists. A 2007 study published in the Proceedings of the National Academy of Science found that modern-day chimps know how to dig for calorie-rich tubers on the savanna. Perhaps our ancestors did the same, boosting their brainpower with veggies.

    As for what motivated the brain to balloon in size, there are three major hypotheses: climate change, the demands of ecology, and social competition.


    7:


    Wrinkles make us smart

    What's the secret to our species' smarts? The answer may be wrinkles. The surface of the human brain is convoluted by deep fissures, smaller grooves called sulci, and ridges called gyri. This surface is called the cerebral cortex and is home to about 100 billion neurons, or nerve cells.

    The folded, meandering surface allows the brain to pack in more surface area -- and thus, more processing power -- into the limited confines of the skull. Our primate relatives show varying degrees of convolution in their brains, as do other intelligent creatures like elephants. In fact, research done by Emory University neuroscientist Lori Marino has found that dolphins have even more pronounced brain wrinkles than humans.


    6:


    Most of our brain cells are neurons

    The old saw that we use just 10 percent of our brainpower isn't true, but we now know that neurons make up just 10 percent of our brain cells.

    The other 90 percent, which account for about half the brain's weight, are called glia, which means "glue" in Greek. Neuroscientists used to think glia were simply the sticky stuff that holds neurons together. But recent research has shown glia to be much more. A 2005 paper in the journal Current Opinions in Neurobiology laid out the roles of these unsung cells, which range from mopping up excess neurotransmitters to providing immune protection to actually promoting and modulating synapse growth and function. (Synapses are the connections between neurons.) It turns out the silent majority isn't so silent after all.


    5:


    The brain is an exclusive club

    Like bouncers at a night club, an assembly of cells in the brain's blood system, called the blood-brain barrier, lets only a few molecules into the nervous system's inner sanctum - the brain. The capillaries that feed the brain are lined with tightly bound cells, which keep out large molecules. Special proteins in the barrier transport necessary nutrients and substances into the brain. Only an elite few make it through.

    The blood-brain barrier protects the brain, but it can also keep out lifesaving medications. Physicians trying to treat brain tumors can use drugs to open the junctions between cells, but that leaves the brain temporarily vulnerable to infection. One new way to sneak meds past the barrier might be nanotechnology. A 2009 study published in the journal Cancer Research showed that specially-engineered nanoparticles can cross the barrier and attach to tumor tissue. In the future, combining nanoparticles with chemotherapy drugs could be one way to target tumors.


    4:

    Electrodes recorded brain activity while infants grabbed for toys. The same brain area showed activity whether infants grabbed for a toy themselves or watched an adult do the same. Credit: Michael Crabtree

    The brain starts out as a tube

    The foundation for the brain is set early. Three weeks after conception, a sheet of embryonic cells called the neural plate folds and fuses into the neural tube. This tissue will become the central nervous system.

    The neural tube grows and differentiates throughout the first trimester. (When cells differentiate they specialize into various tissues needed to create body parts.) It isn't until the second trimester that glia and neurons begin to form. The brain doesn't wrinkle up until even later. At 24 weeks, magnetic resonance imaging shows just a few nascent grooves in the otherwise smooth surface of the fetal brain, according to a 2000 study in the journal Radiology. As the third trimester begins in week 26, the grooves deepen and the brain begins to look more like that of a newborn.


    3:


    Teen brains aren't fully formed

    Parents of stubborn teenagers rejoice, or at least relax: That adolescent attitude stems, in part, from the vagaries of brain development.

    The gray matter of the brain peaks just before puberty and is pruned back down throughout adolescence, with some of the most dramatic development happening in the frontal lobes, the seat of judgment and decision-making.

    A 2005 study published in the journal Child Development found that the parts of the brain responsible for multitasking don't fully mature until we're 16 or 17 years old. And research presented at the BA Festival of Science in 2006 revealed that teens also have a neural excuse for self-centeredness. When considering an action that would affect others, teens were less likely than adults to use the medial prefrontal cortex, an area associated with empathy and guilt. Teens learn empathy by practicing socializing, the researchers said. So much for grounding them until they're 20.


    2:


    Brains never stop changing

    Scientific wisdom once held that once you hit adulthood, your brain lost all ability to form new neural connections. This ability, called plasticity, was thought to be confined to infancy and childhood.

    Wrong. A 2007 study on a stroke patient found that her brain had adapted to the damage to nerves carrying visual information by pulling similar information from other nerves. This followed several studies showing that adult mice could form new neurons. Later studies found more evidence of human neurons making new connections into adulthood; meanwhile, research on meditation showed that intense mental training can change both the structure and function of the brain.


    1:


    Women aren't from Venus after all

    Popular culture tells us that women and men's brains are just different. It's true that male and female hormones affect brain development differently, and imaging studies have found brain differences in the ways women and men feel pain, make social decisions and cope with stress. The extent to which these differences are genetic versus shaped by experience -- the old nature-versus-nurture debate -- is unknown.

    But for the most part, male and female brains (and brainpower) are similar. A 2005 American Psychologist analysis of research on gender differences found that in 78 percent of gender differences reported in other studies, the effect of gender on the behavior was in the small or close-to-zero range. And recent studies have debunked myths about the genders' divergent abilities. A study published in the January 2010 Psychological Bulletin looked at almost half a million boys and girls from 69 countries and found no overall gap in math ability. Focusing on our differences may make for catchy book titles, but in neuroscience, nothing is ever that simple.


    Source: http://www.livescience.com/health/brain-facts-1op10-100417-1.html
    "Blessed are they who can laugh at themselves, for they shall never cease to be amused."
  • Re: 10 Things You Didn't Know About the Brain
     Reply #1 - May 11, 2010, 07:53 PM
    Great article! I'll use it for these arguments:

    Hadith about women half intelligence of men.

    Aisha was no where near mature enough for marriage. 9 or 15. Physically or mentally.

    Evolution is an ongoing process. Mankind are not presented in their final form because there is no final form.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #2 - May 12, 2010, 04:49 AM
    lol good one.


    I am surprised to learn that our brains have shrunk by 10 percent!! That says something about evolution doesn't it!
    Nothing can be more contrary to religion and the clergy than reason and common sense. - Voltaire
  • Re: 10 Things You Didn't Know About the Brain
     Reply #3 - May 12, 2010, 10:08 AM
    Interesting, thanks  Smiley
    Hear ye -->> DONATE TO CEMB

    Relativism | Cognitive dissonance | Cognitive biases | Memeplex | Consequentialism
  • Re: 10 Things You Didn't Know About the Brain
     Reply #4 - May 12, 2010, 02:48 PM
    Quote from: canex on May 12, 2010, 04:49 AM
    lol good one.


    I am surprised to learn that our brains have shrunk by 10 percent!! That says something about evolution doesn't it!


    No it was God.  Roll Eyes
  • Re: 10 Things You Didn't Know About the Brain
     Reply #5 - May 12, 2010, 02:50 PM

    The brain is the biggest mystery of all!

    Thanks Allat for this brainy post.

    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #6 - May 12, 2010, 02:54 PM
    Great post.  Afro

    Quote
    Thanks Allat for this brainy post.


     Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy Cheesy
    "If intelligence is feminine... I would want that mine would, in a resolute movement, come to resemble an impious woman."
  • Re: 10 Things You Didn't Know About the Brain
     Reply #7 - May 12, 2010, 02:54 PM
    Quote
    10 Things You Didn't Know About the Brain


    I thought everything was heart & soul and I didn't know there was a brain until I started using it..     ... yeezevee
    Do not let silence become your legacy.. Question everything   
    I renounced my faith to become a kafir, 
    the beloved betrayed me and turned in to  a Muslim     
  • Re: 10 Things You Didn't Know About the Brain
     Reply #8 - May 12, 2010, 03:02 PM

    Just look at that picture of a brain! And from that emanates all our consciousness, all of the imaginings of humanity, all of Shakespeares words came from one of those, Mozart, Picasso, Da Vinci.....all the science that was worked out in there! Amazing! Unbelievable! From this lump of tissue! Incredible isn't it!

    Oh what an amazing machine of biology we humans are!

    La-di-dah!

    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #9 - May 12, 2010, 03:07 PM
    Quote
    Amazing! Unbelievable! From this lump of tissue! Incredible isn't it!

    Oh what an amazing machine of biology we humans are!

    La-di-dah!

    Damn thing.,

    I was far more happier when I didn't know something like that was there under my  Skull., In fact every animal will be happy, if it didn't know and doesn't use it..
    Do not let silence become your legacy.. Question everything   
    I renounced my faith to become a kafir, 
    the beloved betrayed me and turned in to  a Muslim     
  • Re: 10 Things You Didn't Know About the Brain
     Reply #10 - May 12, 2010, 03:14 PM
    Ignorance is bliss, Yeezy
  • Re: 10 Things You Didn't Know About the Brain
     Reply #11 - May 12, 2010, 05:50 PM
    Quote from: billy on May 12, 2010, 02:50 PM
    The brain is the biggest mystery of all!

    Thanks Allat for this brainy post.




    lol
  • Re: 10 Things You Didn't Know About the Brain
     Reply #12 - May 12, 2010, 05:51 PM
    Quote from: yeezevee on May 12, 2010, 02:54 PM

    I thought everything was heart & soul and I didn't know there was a brain until I started using it..     ... yeezevee


    Sahih Hadith Yeezevee
  • Re: 10 Things You Didn't Know About the Brain
     Reply #13 - May 12, 2010, 05:52 PM
    Quote from: billy on May 12, 2010, 03:02 PM
    Just look at that picture of a brain! And from that emanates all our consciousness, all of the imaginings of humanity, all of Shakespeares words came from one of those, Mozart, Picasso, Da Vinci.....all the science that was worked out in there! Amazing! Unbelievable! From this lump of tissue! Incredible isn't it!

    Oh what an amazing machine of biology we humans are!

    La-di-dah!




    And all the BlackDog jokes, don't forget about those  Smiley
  • Re: 10 Things You Didn't Know About the Brain
     Reply #14 - May 12, 2010, 05:53 PM
    Quote from: billy on May 12, 2010, 02:50 PM
    The brain is the biggest mystery of all!

    Thanks Allat for this brainy post.


     Cheesy

    The brain does find itself to be the most fascinating thing... there is still very little we actually know about it, compared to all it knows about us! Wink
    "Blessed are they who can laugh at themselves, for they shall never cease to be amused."
  • Re: 10 Things You Didn't Know About the Brain
     Reply #15 - May 12, 2010, 05:55 PM
    Quote from: Zebedee on May 12, 2010, 03:14 PM
    Ignorance is bliss, Yeezy


    Sahih Hadith Zebedee
  • Re: 10 Things You Didn't Know About the Brain
     Reply #16 - May 12, 2010, 06:09 PM
    Quote from: allat on May 12, 2010, 05:53 PM

    The brain does find itself to be the most fascinating thing... there is still very little we actually know about it, compared to all it knows about us! Wink


    yeah thats amazing isn't it.

    When we map the brain, the brain is mapping itself!

    Everything else that humans attempt to understand, science, the cosmos, philosophy, art, is the brain investigating, imagining and creating something else.

    Even in medicine, a liver does not investigate itself, a heart or spleen does not investigate itself, nor do the eyes, or toes, or ovaries or testicles!

    But the brain, investigates itself!

    OH MY GOD

    How crazy is that?!?!

    Its almost as if the soul was looking upon its own reflection!

    And yet as yet we understand so little of the mysteries of the brain......maybe because the brain cannot introspect unto itself, because its too deep man! That biology magic that makes us function, staring unto and upon itself, mapping its own mysteries, so that it can understand its own mysteries that it can map!

    This can freak a brain out. It is too far out.

    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #17 - May 12, 2010, 06:11 PM
     Cheesy Cheesy Cheesy
  • Re: 10 Things You Didn't Know About the Brain
     Reply #18 - May 12, 2010, 06:14 PM

    Think about it BD, don't laugh  Angry

    Its very profound if you think about it.

    This wet jelly called 'brain' is the seat and sourse of everything of humankind.

    OMFG, right?

    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #19 - May 12, 2010, 06:22 PM
     Cheesy Cheesy "wet jelly"

    Sorry you are right, it's very profound lol
  • Re: 10 Things You Didn't Know About the Brain
     Reply #20 - May 12, 2010, 06:36 PM
    Quote from: billy on May 12, 2010, 06:09 PM
    But the brain, investigates itself!

    OH MY GOD

    How crazy is that?!?!

    Its almost as if the soul was looking upon its own reflection!

    And yet as yet we understand so little of the mysteries of the brain......maybe because the brain cannot introspect unto itself, because its too deep man! That biology magic that makes us function, staring unto and upon itself, mapping its own mysteries, so that it can understand its own mysteries that it can map!

    Worth reading Douglas Hofstader's books on this point about how consciousness came about and its nature: start with I am a strange loop and Goedel, Escher Bach - Goedel Escher Bach is more accurate, though more esoteric.  Basically he makes analogies from reflexive systems in other areas - from Goedel's incompleteness theorem to Escher's pictures.
  • Re: 10 Things You Didn't Know About the Brain
     Reply #21 - May 12, 2010, 06:39 PM

    Thanks hupla.

    Or more accurately, my brain says 'thanks' Afro
    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #22 - May 12, 2010, 06:43 PM

    ++++

    "In the end, we self-perceiving, self-inventing, locked-in mirages are little miracles of self-reference.”
      
    — Douglas Hofstadter, I Am a Strange Loop p.363

    ++++



    Wow. Far out.


    "we can smell traitors and country haters"


    Quote from: arX on May 01, 2011, 03:33 AM
    God is Love.
    Love is Blind. Stevie Wonder is blind. Therefore, Stevie Wonder is God.

  • Re: 10 Things You Didn't Know About the Brain
     Reply #23 - May 13, 2010, 05:37 PM
    Quote from: billy on May 12, 2010, 06:09 PM
    yeah thats amazing isn't it.

    When we map the brain, the brain is mapping itself!

    Everything else that humans attempt to understand, science, the cosmos, philosophy, art, is the brain investigating, imagining and creating something else.

    Even in medicine, a liver does not investigate itself, a heart or spleen does not investigate itself, nor do the eyes, or toes, or ovaries or testicles!

    But the brain, investigates itself!

    OH MY GOD

    How crazy is that?!?!

    Its almost as if the soul was looking upon its own reflection!

    And yet as yet we understand so little of the mysteries of the brain......maybe because the brain cannot introspect unto itself, because its too deep man! That biology magic that makes us function, staring unto and upon itself, mapping its own mysteries, so that it can understand its own mysteries that it can map!

    This can freak a brain out. It is too far out.






    You are so right billy! The brain trying to understand itself is just amazing and on another level than just studying something else out there, whether it's another body part, other life forms, economics...
  • Re: 10 Things You Didn't Know About the Brain
     Reply #24 - May 13, 2010, 05:40 PM
    Imagine a neuroscientist doing a psychoanalysis on themselves.



  • Re: 10 Things You Didn't Know About the Brain
     Reply #25 - May 13, 2010, 05:42 PM
    I'll take the green pill. Would be nice if there was a purple one though.
  • Re: 10 Things You Didn't Know About the Brain
     Reply #26 - May 13, 2010, 05:43 PM
    As long as it doesn't turn you in Prince.
  • Re: 10 Things You Didn't Know About the Brain
     Reply #27 - May 13, 2010, 05:45 PM
    This is my symbol ££££
  • Re: 10 Things You Didn't Know About the Brain
     Reply #28 - May 13, 2010, 06:26 PM
    lol
  • Re: 10 Things You Didn't Know About the Brain
     Reply #29 - May 13, 2010, 08:09 PM
    Quote from: billy on May 12, 2010, 06:09 PM
    yeah thats amazing isn't it.

    When we map the brain, the brain is mapping itself!

    Its not an objective source, therefore I rule out all such studies.
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