What makes one human brain different from another human brain?

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I know there’s much we don’t know, but I suspect that means we’ve found more differences than similarities? How does / how much can one brain vary from the next?

In: Biology

My understanding is that brains are still under construction until youre about 2 years old, and they are full of excess connections and then it starts pruning to just keep the ones that work. So a lot of how your brain works is dependent on those early experiences which are unique to you.

If we keep with the pruning analogy it’s like each persons brain is an unruly bush when they’re a toddler, and it gets pruned into shape by your experiences. Some people may end up with a beautiful one and some may end up with a scraggly one

You have something called epigenetics. Epigenetics are things that change in the DNA of the organism after their sexual or asexual reproduction has taken place. In certain varieties of corn, and the fur of dogs for instance, epigenetics creates a unique pattern. It is believed to be the cause of different personalities even in twins.

[https://www.google.com/search?client=ubuntu&channel=fs&q=epigenetics+in+the+brain&ie=utf-8&oe=utf-8](https://www.google.com/search?client=ubuntu&channel=fs&q=epigenetics+in+the+brain&ie=utf-8&oe=utf-8)

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Basically, in true ELI5 fashion, your brain literally mixes up the rubiks cube of parts of your DNA in order to create as random of a thought process as possible, as some form of selection in our evolutionary history selected for this. It likely partially lead to us thinking out of the box.