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Why did our brains stop expanding?

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#1 by tasman1 » Sun May 08, 2016 21:53

Why did our brains stop expanding?............In the forest the human brain was expanding and expanding at a phenomenal rate. Sometime at around 200,000 to 150,000 years ago, this process came to an end. The brain stopped expanding and started to shrink. This key point in our evolutionary journey has been noted but rarely addressed, and its significance comprehensively ignored. - See more at: Why did our brains stop expanding? | Ancient Origins

Christopher Ruff, of John Hopkins University, and his colleagues thoroughly analyzed the fossil record to determine the evolving body mass and brain size of the various Homo species leading up to us. The results show that the assumption of a straight progression from a pea-brained ancestor to the ultrabrainy modern Homo sapiens is decidedly shaky. Hominid brains appear to have remained fairly constant in size for a long period from some 1.8 million years ago until about 600,000 years ago. But then, from 600,000 to 150,000 years before the present, fossils show that the cranial capacity of our ancestors skyrocketed. Brain mass peaked at about 1,440 grams (3.17 pounds). Since then brain mass has declined to the 1,300 grams (2.87 pounds) that is typical today (Ruff 1997). - See more at: Why did our brains stop expanding? | Ancient Origins
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#2 by tasman1 » Sun May 08, 2016 21:59

Sir David Attenborough: Humans have stopped evolving
Human beings have stopped evolving after becoming the only species to “put halt to natural selection of its own free will”, Sir David Attenborough has said,
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#3 by BouldRake » Sun May 08, 2016 22:01

You ever had a kidney stone?

Now imagine your penis is a vagina, and the kidney stone is a baby. Now you understand why there's an optimal brain size that isn't necessarily larger.
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#4 by tasman1 » Sun May 08, 2016 22:05

BouldRake wrote: You ever had a kidney stone?

Now imagine your penis is a vagina, and the kidney stone is a baby. Now you understand why there's an optimal brain size that isn't necessarily larger.



I call it , LIMIT , hmmmmm and we still think one day we will be God [ my opinion We will be monkey again ]
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#5 by tasman1 » Sun May 08, 2016 22:15

One thing is for sure: our species is changing. In particular, as our society becomes ever more complex, it is perhaps also becoming increasingly fragile. As we become adapted to an ever more artificial environment, we can only become more vulnerable – and what will happen when that artificial environment ceases to exist?
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#6 by BouldRake » Sun May 08, 2016 23:33

Punctuated equillibrium.

Sometimes selection pressures are very weak, and not much changes. I don't agree that humans have stopped evolving (and I don't think Attenborough does either - he's just simplifying things; that's his job), but it is very clear that this is a time of low selection pressure.

Then something happens, a selection pressure is very strong, and everything changes. In the fossil record it appears new species spring up overnight, but it's more likely the intermediaries die overnight.

In our case, selection pressures are low because we can fix them with technology. And when, and if it finally fails, suddenly selection pressures will be very high. Future paleontologists will bicker among themselves about whether fragments of bone denoted distinct species or mere varieties of the same species. They will speak of us as we speak of Lucy and Karabo. Our true names forgotten, our history unremembered, our hopes and dreams mere dust.

But hey, one of them might share a few genes with you, so that's something.
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#7 by valerie » Sun May 08, 2016 23:48

I think if they are going to accuse diet of the lack in growth of the human
brain, then what is their excuse for other animal brains that have
predominantly stayed the same?

No doubt a bad diet can affect all aspects of a body but in regards to
stopping brain growth, I don't fall for it because there is a wide variety
of diet all across the world. Just because little dotty is fat in the USA
from eating twinkles does not mean little sungfoo is fat in China from
eating sushi.

I would think, if it has anything at all to do with evolving, that it would
be a simple answer. For example, think of filling up a swimming pool
that is wider and deeper at the bottom but becomes more narrow at
the top. How long does it take to fill the swimming pool? So of course
it is going to take you longer when you begin filling the pool than it is
once you get nearer the top. At some point, it's going to get full and
over flow UNLESS someone pulls the plug......OR.....someone simply
stops filling the pool.
Last edited by valerie » Sun May 08, 2016 23:51 » edited 1 time in total
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#8 by tasman1 » Mon May 09, 2016 00:36

My opinion in this

intelligent people, athletic people, artistic people still exist - and still continue to marry and reproduce with those of similar interests. society has always categorised people into strictly superior, and inferior groups. ALL we see with the birth-rate here, is an accelerated gap between these groups.
the fact is the smartest of the smart and the fastest of the fast are still smarter and faster than they were 100 years ago. only the average has declined. human evolution for some is going UP, for the MAJORITY it is going DOWN.
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#9 by True-Democracy » Mon May 09, 2016 04:27

To be honest it is for certainty that animals are smarter then they make us believe.

Example of a cat and dog working together when they think humans are not watching: :clap:



Here are animals that make use of tools: smart-animals

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#10 by harsha_vdn » Mon May 09, 2016 05:51

Google for "Neuro Plasticity". New brain-cells can keep growing till we die, if we make conscious effort. A great realization that brain can be changed, it can change our body etc!

Greatness of a genius is not about the mass, it is about the the number of connections among different cells! A genius keep s them increasing every day. We too can make it, ONLY if believe and act.
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#11 by valerie » Mon May 09, 2016 08:52

Well I think some of this topic has gotten lost in translation.

It's about the skull size due to brain size.

I don't think the human brain/head size has changed very much over time.

What about David in the bible? It's a fact many giants existed at one time....
people that were considered giants because they were 7 or 8 foot tall. Was
their heads and brains any larger in regards to their body mass? No.

I don't think it's so much about the size of our head or size of our brain that
matters (get it, matters), as it is how much of our brain we use.

Take the most intelligent people in the world and their head and brain size
is no different than anyone else.
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#12 by proadco » Mon May 09, 2016 11:52

Have you seen the recent protesters in Chicago, California and other cities. No way they have a brain.
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#13 by zegon » Mon May 09, 2016 12:04

According to my wife, so do i have no Brains.

So i'll probably go to the doctor and check it out.
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#14 by Darkstar2 » Mon May 09, 2016 12:24

zegon wrote: According to my wife, so do i have no Brains.

So i'll probably go to the doctor and check it out.

...things only go downhill from there mate ! :D
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#15 by valerie » Mon May 09, 2016 23:48

I've known lots of brainless people.

Some times, I feel brainless.

Did I tell you about my brushing my teeth with cortisone the other day?

Whew, it tasted nasty! I thought I was grabbing a tube of toothpaste
but instead I had grabbed a tube of cortisone. What's even very much
more brainless is that I actually brushed my teeth for several seconds
before realizing the taste was not the least bit frothy nor minty....instead
it was blah and bitter.

All I could think about was the old woman with old-timers disease that
never could find her car keys because she always put them in a strange
place.....like in the freezer or in the coffee maker or in the washing
machine or....

:?
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#16 by wombatqueen » Fri May 13, 2016 04:09

valerie wrote: I've known lots of brainless people.

Some times, I feel brainless.

Did I tell you about my brushing my teeth with cortisone the other day?
....

:?

AAAhhh yes.......but let's review:
YOU are the amazing woman who decided to take on LEARNING (self-taught, of course) the skills of using a sewing machine -

and then proceeded to to take on LEARNING (self-taught, of course) how to do sewing machine repair.....

Brainless?? I think not.... ;)
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#17 by pindokhan123 » Fri May 13, 2016 04:30

my hubby calls me brainless sometimes and i tell him, if he had enough working brain cells then why did he marry me?
he was wooing me for a good 6 months b4 we tied the knot, didnt see me brainless then,did he? :D


Ahhh the power of love,truly blind :D
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#18 by tasman1 » Fri May 13, 2016 05:23

pindokhan123 wrote: my hubby calls me brainless sometimes and i tell him, if he had enough working brain cells then why did he marry me?
he was wooing me for a good 6 months b4 we tied the knot, didnt see me brainless then,did he? :D


Ahhh the power of love,truly blind :D



HA HA , YOU LUCKY . My wife call me every time brainless , it is going for so long that i am now not sure if i have it or not
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#19 by pindokhan123 » Fri May 13, 2016 05:31

haha tasman you are so funny made me laugh,,my husband can call me what he wants at the end of the day,i decide who got more brains,him or me,,,,,,,,,,,,,,,,,,its definetly him :lol:


i wear the pants and he wears the skirt,only when i am washing his pants :D
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#20 by valerie » Fri May 13, 2016 08:51

Take 'Brain Booster' vitamins. Suppose to give the ole brains a big BOOST. :roll:
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