Saya menemukan video TED yang membahas tentang otak kita yang spesial ini. Video yang menarik. Ibu Suzana Herculano-Houzel mempresentasikan materinya dengan bahasa yang mudah dipahami. Cara menyampaikannya pun juga menarik dan tidak kaku. Berikut videonya.
If all brains were made the same way and you were to compare animals with brains of different sizes, larger brains should always have more neurons than smaller brains, and the larger the brain, the more cognitively able its owner should be. So the largest brain around should also be the most cognitively able. And here comes the bad news: Our brain, not the largest one around. It seems quite vexing. Our brain weighs between 1.2 and 1.5 kilos, but elephant brains weigh between four and five kilos, and whale brains can weigh up to nine kilos, which is why scientists used to resort to saying that our brain must be special to explain our cognitive abilities. It must be really extraordinary, an exception to the rule. Theirs may be bigger, but ours is better.
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We found that we have, on average, 86 billion neurons, 16 billion of which are in the cerebral cortex, and if you consider that the cerebral cortex is the seat of functions like awareness and logical and abstract reasoning, and that 16 billion is the most neurons that any cortex has, I think this is the simplest explanation for our remarkable cognitive abilities.
... So the reason why the human brain costs so much energy is simply because it has a huge number of neurons ...
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To cook is to use fire to pre-digest foods outside of your body. Cooked foods are softer, so they're easier to chew and to turn completely into mush in your mouth, so that allows them to be completely digested and absorbed in your gut, which makes them yield much more energy in much less time.
So I think this explains why the human brain grew to become so large so fast in evolution, all of the while remaining just a primate brain.
With this large brain now affordable by cooking, we went rapidly from raw foods to culture, agriculture, civilization, grocery stores, electricity, refrigerators, all of those things that nowadays allow us to get all the energy we need for the whole day in a single sitting at your favorite fast food joint. So what once was a solution now became the problem, and ironically, we look for the solution in raw food.
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"... And so what I'm arguing against it's the shame that associated with desires. It's the idea that if you love your husband or wife but you still attracted to other people, there's something wrong with you, there's something wrong with your marriage, something wrong with your partner. I think a lot of families are fractured by unrealistic expectations that are based upon this false vision of human sexuality."