Size doesn’t matter—or does it?
Another ongoing debate is how your brain’s size impacts your smarts. “The size of the brain is not linked to intelligence or learning new material,” Dr. Tarawneh says. Comparing the brains of great thinkers, writers, and mathematicians after autopsy hasn’t yielded conclusive evidence that their size has a correlation to intelligence. Even among different species, research has shown that when it comes to brain-to-body ratio, the “smarter” animals don’t always have bigger brains. However, scientists have come up with an “encephalization quotient” that compares animals based on their relative body size—and humans finally come out on top. Check out these quirky habits that prove you’re smarter than everyone else.
The size of our brains cause us to be born “too soon”
The theory of the “fourth trimester” suggests that babies are born when their bodies are still very fragile in order to allow for their relatively large brains to have room to be delivered. (Here are more bizarre facts about newborns that doctors don’t tell you.) “I always tell my patients that all babies are born too soon,” says Harvey Karp, MD, author of The Happiest Baby on the Block and creator of the “smart sleeper” SNOO. “Think about it—a horse can walk on the very first day of life, but by comparison, human babies are super immature. They can’t walk, run, or even burp without help from Mom or Dad.” A horse’s survival depends on his body, but human survival depends on our brain. “So, our species evolved to evict our little genius babies from the womb three months early—before their heads get so big that they risk getting stuck in the birth canal,” Dr. Karp says.
Brain folds have function
Although Dr. Tarawneh says that the number of folds, or gyri, in the human brain doesn’t always equal intelligence, they do have a purpose. The folds allow for more surface area on the outer layer, or cortex, of the brain. “The cortex is the computational part on the outer surface of the brain, where the majority of the brain cells are,” Dr. Tarawneh says. Monkeys and dolphins also have wrinkly brains, whereas the surface of mice brains are smooth. But, scientists are still researching how these folds develop.