All human brains same

Our brains are all made of the

Many people assume human brains vary genetically and genetic variation maps to races. But the races are not real and genetic variation can’t explain brain differences. Because, dear reader, brains don’t work that way.

Let’s look just at the brain part of this problem.

A Repost

There are between 50 and 100 billion neurons in the human brain, and every one is connected to a minimum of one other neuron to produce about 100 trillion connections. So when we are thinking about how the brain is wired up, we have to explain how so many connections can be specified to make the brain work.

There are thousands of genes that seem to be expressed mainly or exclusively in the brain … perhaps as many as 10, 000 (or about half the genes that are active in the human genome) … but this vast difference between number of connection and number of genes is true to nearly the same extent for all mammal brains. A human brain has way more connections (and much more “higher cognitive function”) than a mouse brain, but with about the same number of genes, There may be some unique added genes in the human, but the number of additional brain circuits required to add human language and cognitive function to a mouse can not be explained by more genes unless individual genes do not do much in the way of detail.

All human populations over long(ish) evolutionary time are subjected to similar selective pressures to have a smaller brain. Large brains in humans kill mothers and children in birth. Death in childbirth is, in fact, higher for humans in a “natural state” than other mammals. The large brain is being selected against to a significant degree, or at least, it is safe to assume this.

However, large brains persist. There is some literature suggesting that some “races” have smaller brains than others. As far as I know these assertions are very suspicious, and while brain size varies across different samples, there is no reliable data suggesting that there are major population level differences in human brain size. Some of the differences that have been asserted in the literature have involve very poor data and very inappropriate manipulation of the data to make it look like there are significant population differences in brain size.

You might also like

Find the Human Consciousness switch (key brain)
Find the Human Consciousness switch (key brain)
We are all the same
We are all the same
Doctor's Best Doctor's Best Sam-e 200 mg, 60-Count
Health and Beauty (Doctor's Best)
  • Doctor s Best SAMe is proven to enhance mood and promote cognitive health
  • SAMe is essential for the healthy metabolism of the major brain transmitters dopamine, serotonin and norepinephrine
  • SAMe has been proven to promote joint comfort and mobility and supports liver health and detoxification
  • SAMe s effectiveness has been proven with 18 controlled human trials published over 40 years
  • Pharmaceutical grade, Non-GMO, Gluten Free, Vegan
Eurographics - Toys EuroGraphics Human Body (The Brain) 1000 Piece Puzzle
Toy (Eurographics - Toys)
  • 1-Piece Puzzle
  • Box size: 10 x 14 x 2.37
  • Finished Puzzle Size: 19.25 x 26.5
  • Manufactured using the highest quality blueboard
  • Made in the USA
  • Made in the United States
  • 100% recyclable, safe, non-toxic, and printed with vegetable-based inks and Certified by the Forest Stewardship Council
  • Printed in Canada, made in the United States
  • Puzzle pieces are manufactured using the highest quality 0.07 blueboard, offering an exact fit without fraying over time and use
  • Assembling puzzles improves fine motor skills and picture recognition abilities - promotes both cooperative and independent play
24 HALLOWEEN SCARY GROSS ZOMBIE BRAINS REAL HUMAN PRECUT EDIBLE CAKE TOPPERS 1.5" SMALL 2 Dozen Set - Cake, Cookie, Lollipop and Cupcake Toppers, Decorations for Children's Birthdays Party Supplies
Grocery (Picture Cake Toppers)
  • Item ships SAME DAY with NO DELAYS! Get your items FAST!
  • You will receive items as pictured.
  • 24 edible toppers as pictured. Diameters are about 1.5 inches each
  • Toppers are completely edible & made from WAFER PAPER & EDIBLE INK! Virtually TASTELESS & similar to a communion wafer.
  • Pre-cut and ready to use, just place onto icing (will not melt into icing)
Top Selling Decals - Prices Reduced : The human brain is a wonderful thing. It starts working the moment you are born, and never stops until you stand up to speak in public. -George Jessel Funny Humorous Inspirational Life Joke Quote Picture Art Home Decor Living Room Bedroom Wording Graphic Design Mural Size : 4 Inches X 32 Inches - Vinyl Wall Sticker - 22 Colors Available
Home Improvement (Design With Vinyl Decals)
  • YOUR DECAL WILL BE SENT AS SEEN UNLESS YOU EMAIL US WITH YOUR COLOR CHOICE AT THE TIME OF YOUR ORDER . WE SHIP VERY FAST AND NEED YOUR COLOR CHOICE AT THE SAME...
  • Please follow the above directions if you want a color other than whats shown. Color choices & important details are in the description below.
  • Available Color Choices : Black, White, Red, Burgundy, Dark Brown, Orange, Yellow, Lime Green, Kelly Green, Dark Green, Teal, Baby Blue, Medium Blue, Dark Blue...
  • ** All Pictures In This Ad Do Not Represent The Actual Size Of The Decal ** The Actual Size Of The Decal Is Noted In The Product Title Above.
Mind Puzzle Mania Games Fever Three Way Stage
Mobile Application (Mind Puzzle Mania Games Fever)
  • Connect several jewels of the same kind to get more jewels to take home! Three Way Stage is a match3 saga deluxe equipped with lovely items, impressive pixel art...
  • Download Three Way Stage and spend several hours playing without noticing! It s the perfect time killer for every situation! It will make time go faster, you just...
  • In case you are searching for new match 3 games, you don t have to look further, get your brain activated with our difficult levels and start rising your skills...
  • Tap the items alike that are next to each other. This will eliminate them and you ll score many points. Tap more than 5 and be great at it, score more than 10 and...

Copyright © . All Rights Reserved