Brain folds have function
Naeblys/Shutterstock 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.
The nature of intelligence isn’t known
Dean Drobot/Shutterstock You can fake being smart (especially with these easy ways to look like a genius), but what really makes us intelligent, if not brain size and folds? “Although we still do not know all of the biological processes that explain intelligence, intelligent people probably have better connections between the neurons, referred to as synapses, and their neurons have stronger networks in certain brain regions that allow the brain cells to communicate with each other more efficiently,” Dr. Tarawneh says. She notes that anatomy may have something to do with it, as some studies suggest more intelligent people may have thicker cortices (the outer part of the two hemispheres), particularly in some parts such as the parietal lobe.
IQ is not fixed
Chompoo Suriyo/Shutterstock Although the origins of intelligence are still being researched, it does seem clear that IQ, or intelligence quotient, is not fixed—it can change throughout your life. In fact, some experts argue that there’s no such as thing as “IQ” at all, but that experiences and learning, as well as the testing itself, are variable and can change over time. Studies show our nutrition and other environmental factors may also impact brain power. “We used to think that once smart, always smart and vice versa—we now know that is wrong,” says Sandra Bond Chapman, PhD, founder and chief director of the Center for BrainHealth at the University of Texas at Dallas. “Science clearly reveals that the brain and our ‘smartness’ are anything but fixed. We continuously shape and rewire our brain by how we think.” That’s one of the reasons you shouldn’t tell your children they’re smart