Does Brain Size Affect Intelligence?

Brain volume is also called "cranial volume". The volume of the skull lumen, which is called the brain volume, is measured in milliliters.

Brain capacity

Brain capacity is also called "

Scientists from the Kunming Institute of Zoology, Chinese Academy of Sciences have discovered a new gene that affects human brain capacity. Sequence mutation sites (rs31480, etc.) located in the 23.2-33.1 region of the long arm of chromosome 5 are significantly related to brain capacity. The research results are published in the journal PLoS One. ^[1]

Over the past 20,000 years, the average brain capacity of human men has fallen from 1500 cubic centimeters to 1350 cubic centimeters, which has reduced the size of a tennis ball by a large margin, while female brain volumes have also decreased in the same proportion. In fact, humans have not become stupid. The brain is evolving toward "smaller space, more efficient work." After all, no one wants to bear a big head like an alien.

A large part of the brain is used to control body movements. The larger the body, the more muscles attached to the bones. The brain needs to grow larger and heavier to control the body and muscle groups. Experts from Cambridge University said that the size and height of modern humans are 10% smaller than those of ancestors who depended on hunting for living 10,000 years ago. This discovery subverts the idea that humans have become taller and more burly, and many data on physical development support this view.

Neither the brain nor the physique is bigger and better. The evolution direction of human beings is obviously not to evolve to behemoths. Just like computers and mobile phones, as long as they can be successfully applied in the early days of invention, later development will start to think of continuous improvement.

Brain capacity has only one connection with IQ: when the brain capacity becomes extremely small or too large, it may affect IQ and make people stupid. ^[2-3]