Why human brain is shrinking since 10000 years?

Human brains have undergone a remarkable increase in size over millions of years, especially during the early evolution of Homo sapiens.

However, studies analyzing fossil and modern human skulls have found a slight reduction in brain volume in the last 100,000 years, with some research indicating that the decrease may have started around 30,000 years ago.

While the exact reasons for this recent brain size reduction are still debated, scientists have come up with potential explanations.

Emergence of writing and complex social systems: These advancements may have allowed for the externalization of cognitive processes, reducing the need for larger brains.

Smaller brains might be more advantageous in certain environments or social contexts, leading to a shift in the average brain size.