Modern Human Brains Shrinking

Does physical brain size and intelligence directly proportional? – when your brain size is big so also your intelligence?

Recently on the news, a brain scientist name Jeff Morgan Stibel, according to his study said that physical human brain size has greatly decreased for the past 50,000 years as well as encephalization for anatomically modern humans published on the Brain, Behavior and Evolution thus also cognition [?]

In previous studies, it said that the growth of cognition is also directly proportional to the growth of brain size and encephalization growth. In short as the brain size and encephalization grows so also cognition.

“Growth in human brain size and encephalization is well documented throughout much of prehistory and believed to be responsible for increasing cognitive faculties.” (Karger/Decreases In Brain Size And Encephalization In Anatomically Modern Humans)

According to various scholars on any discipline, the decline or the decreased in size of the physical brain have affected changes on behavior and cognition but it is not clear why human physical brain decline or decreased on size.

“This has led scholars across various disciplines to propose that brain size declines have resulted in changes to human behavior and cognitive ability, a theory that is now prominent in popular literature.” (Karger)

“. It is not clear, however, why human brain size has been declining since at least through the Late Pleistocene. Nor do we know the impact, if any, to human cognition.”(Karger)

The shrinking in size or the decline of human physical brain size, according to the news, could be result of an environmental factor such as technology, education, and health. While encephalization is due to obesity.

“In fact, environmental factors such as health, education, and technology might have made up for the fact that our brains were shrinking — or that brain volume isn’t strongly correlated with intelligence.” (Futurism)