This is the result of the identification of brain shrinkage 3,000 years ago by experts / Wion News
JAKARTA, kilat.com- After analyzing the skull fossils, para scientist have identified the reason behind the shrinking of the human brain 3,000 years ago.
The study, published in the journal Frontiers in Ecology and Evolution, shows that our ancestors had brains larger than our own.
According to the study’s lead author Jeremy DeSilva, an anthropologist at Dartmouth College in the United States, “This is much more recent than we thought. We were expecting something closer to 30,000 years ago.”
The brainwhich has been mankind’s greatest advantage in surviving disasters and subjugating other species throughout history, contains 86 million neurons.
In comparison, an ant’s brain is roughly one-tenth of a cubic millimeter in volume and contains only 250,000 neurons.
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“The assumption is that brain evolution was essentially Pleistocene, so when you find a 4,000-year-old skeleton or skull, people aren’t going to run to measure brain size. The assumption will be the same as people living today and the same people living at the end of the Pleistocene,” said DeSilva.
“What we can determine is that the downward trend is best positioned around 3,000 years ago.”
The brain man, which weighs about three pounds (1.4 kg) and is made mostly of water, are the building blocks of the nervous system and each neuron in the brain can send as many as 1,000 signals at an impressive speed of up to 250 miles. one hour.
“As these social insects became more and more social, their neural ganglia got bigger, but they reached a point where there were so many of them that they specialized and relied on one another through collective intelligence,” says DeSilva.
He added, “Our interpretation is that humans are becoming more social and may experience similar things. If you can have a smaller brain, and store more information on the outside, and then interact with it in more complex ways, you can have the best of both worlds where your collective intelligence increases as a society and as a population, though each each individual’s brain might get a little smaller.”
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And because one neuron can connect to at least 1,000 other neurons, a single brain may have at least 100 trillion connections overall. But brain signals, which use electricity, involve less than a tenth of the voltage of a typical flashlight battery.
“As humans moved into more sedentary communities, what we saw with the start of agriculture was an increase in disease,” said DeSilva.
“More people in a confined area means that infectious diseases spread more easily, and if your body is exposed to these pathogens, you’re going to use a lot of energy for the immune system, which means less energy for brain growth,” he adds. (nda/cen)
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