This Is How Your Brain Grows


Inside your head you have about 86 billion
brain cells, or neurons. That’s Joe, from It’s Okay To Be Smart. Now all those neurons live in particular regions
of your brain. Take these here, those are the ones that help you see, whereas, well,
way over here, those are the ones that help you move. And it’s pretty amazing to think that these
neurons connect with other neurons in all of these areas to form this crazy network
that controls all of your thoughts, feelings and actions. It makes me wonder — where do all these neurons
come from? It is determined when your brain starts growing which neurons will be responsible
for you getting excited about history or math or labradoodles? Is it weird that I wonder
these things? It’s okay to be smart. Well your brain starts growing when your whole
body is smaller than a dime. The speed of growth is incredible. During early pregnancy,
neurons develop at the rate of 250,000 every minute. Of the 40 weeks it takes a baby to grow, your
neurons are mainly developed between 10 and 20 weeks and then these newly formed neurons
start to migrate. This part is really cool. They head off to regions of the brain where
they’re gonna live the rest of your life. Now each neuron carries a special code that
tells it exactly where it’s going to end up. And as they migrate, they start off as just
cell bodies, the control centres and factories of the neuron. And It’s not always fun travelling by yourself.
With your neurons migrating, glial cells glue neurons together to give your brain structure. Once the cells reach their final destinations,
then connections among them begin to develop. Synapses form, the tiny space between neurons
that let them communicate with each other. And a fetus lets you know when this is happening.
They start to have periods of activity and rest — they can nap! And even yawn. During the last 8 weeks of a pregnancy, a
fetus can hear, smell, respond to touch and light. And they can learn.
In one study women read The Cat in the Hat out loud for the last 6 weeks of their pregnancy.
And when their babies were born, they were able to suck on special pacifiers that allowed
them to hear their Mother reading that story to them. And they quickly adapted to do it
in just the right way to hear their Mother’s voice. Babies brains are incredibly adaptable. They
form 700 new connections between neurons every second in the first years of life and by the
time they’re 3, their brains have formed 1000 trillion connections. By age six, your brain is 90% of your adult
brain size. While it doesn’t grow a lot more in size, your brain development extends through
late adolescence, and arguably throughout the rest of your life. While you’ll develop new connections for the
rest of your life, most of your brain has been there before you were even born. So why are our brains in our heads to begin
with? Head over to It’s Okay To Be Smart, where Joe tackles evolution head on. And if
you haven’t already, subscribe to BrainCraft! I have a new episode out every other week.

46 thoughts on “This Is How Your Brain Grows

  1. 2:43 "arguably throughout the rest of your life"
    New research supports this thesis strongly, the brain improoves and develops into the late 70th!
    book suggestion:
    "The secret Life of the Grown up brain"

  2. I've always wondered how neurons replenish neurotransmitters. For what I remember from biology in highschool, neurotransmitters are lost with each "blast" in the synapse. So with those neurons firing all day long (like the ones in the heart), don't they run out of them rather quickly?

  3. @Bas Nation 
    English originally came from a dialect of High German. From what point in history do you stop calling the language German and start calling it English? I suppose only when you name it. there was no first English speaker because it came about in a population. it wasn't created, it is a dialect that became so variant from the mother language that its no longer mutually intelligible. If you look at all the languages you have in existence in Europe today (with Hungarian as an exception), and went back in time, you would notice that there are groups of languages that share a much older ancestor language, and later you would discover that all those mother languages come from one language that was spoken 5000 years ago. 

    just like in biological evolution, the majority of all the language in existence have died out. during the time that this mother language existed, many other languages also existed. Now just replace the language names species in what I just wrote and you have a perfect explanation for how Evolution works at a fundamental level.

    The reason why language diversification is such a great analogue is because our bodies, populations and species really are a result of language diversification. Our genes are just like languages, Every individual has their own slight "linguistic" variations as a result of transcription errors, duplication, and reassignments to new alleles or "words", and when they become geographically isolated, they diversify from their common origin over time. Eventually some related populations can't breed anymore. Eventually some languages will be unintelligible from their cousins which diversified from the same ancestor or mother language.

    So now I place the question on you with a similar process. 
    What was the "missing link" between High German and English?
    What was the "missing link" between wolves and domestic dogs?
    What was the "missing link" between apes and humans?

    The answer is there are no missing links because its a malformed question based on a misunderstanding of how evolution works. 

    http://chips24.tumblr.com/post/91077483726/scientific-thinking-and-the-theory-of-common-descent

  4. well this is my first video ive watched of your channel, and is there any way you could get ANYONE else to narrate the female part, im sorry but i want to rip out my ear drums listening to her, just do the male voice or get a different female if you must have a woman's voice in it.

  5. This is a really interesting video but I couldn't hear almost anything because the music was louder then You 🙁

  6. I usually see a flurry of negative comments on videos about the brain.. It's like people are afraid to admit that their mind is their brain, so they usually attack a video going over how the brain works. They'll nick pick about a video that is only a few minutes, not realizing that you'd need hours and hours to fully explain the brain.. and we're not even that deep into the brain. With it's amount of complexity, we have a lot of learning to do yet. This video did a good job with the information and with the time allotted. I am enjoying this collaboration too. You should try to make a more in depth video and throw in some random, "mind" blowing facts. My favorite is that (according to a speaker for the Royal Institute) if you laid your neurons and all the connections they form end to end, it'd be enough to circle the globe almost 4 times.

  7. Imagine what happens to a baby boy when he's strapped down and someone slices off the tip of his penis.  All those nerve endings firing excruciating sensations of pain directly into the base of the brain.  It can't be good.   

    STOP CIRCUMCISION NOW!  

  8. Ugh there's something about this video lol.. that made me look down to see how much time was left. No offense

  9. Black people are the overwhelming majority of most African countries, Asians are the overwhelming majority of most Asian countries, and both will continue to be so in the foreseeable future, So when you hear that White people are projected to be a minority in ALL White countries within decades, what does that mean to you?
    Massive non-White immigration is occurring in ALL White countries and ONLY in White countries. This is part of a program of genocide against White children,
    They say it's anti-racist, but it's simply anti-White.
    Anti-racist is a codeword for anti-White.

  10. 2:05  What does this have to do with an infant learning words from the Cat in the Hat? Doesn't every child yearn to hear their mother's voice? 

  11. @BrainCraft In this video you say that a baby makes 700 new interneuron connections every second, and make over 100 trillion connections by the age of 3. However, I read in Bruce Hood's "The Self Illusion" that when a human's brain develops, it starts off with more connections than it ever will have, and that over time when connections are not stimulated they are lost (a 'use it or lose it' theory). This also accounts for the reason why babies have windows of opportunities when their brains are developing; e.g. it's harder for a person to distinguish between faces within a race if that person wasn't exposed to those kinds of faces when their brain was developing as a baby – which is why a european might think all asians look alike, but an asian will be able to distinguish asian faces better.
    So do connections increase when our brains develop as babies?

  12. but your neurons change move and die and get renewed everyday like your brain as a child is not the same brain you have as n old person . this is the reason people develop brain malfunctions and other problems as they grow your brain always changes and was not the same yesterday as to day .. ??

  13. Thank u so much for this video. It helped alot to understand better. I have a que though. Brain forms 1000 trillion connection by the age 3. Trillions as in short scale or long scale?

  14. what cells are behind the high rate of development of the neuron cells during the early stages? And do those particular cells have i guess a kind of half life over the course of apersonns life?

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