If form follows function in evolution, why do we have such large brains that we reportedly use so little off?

Answer 1

Encephalization refers to the tendency for a species toward larger brains through evolutionary time.

Anthropological studies indicate that bipedalism preceded encephalization in the human evolutionary lineage after divergence from the chimpanzee lineage. Compared to the chimpanzee brain, the human brain is larger and certain brain regions have been particularly altered during human evolution. Most brain growth of chimpanzees happens before birth while most human brain growth happens after birth (see: Heterochrony).

In 2004, Dennis Bramble and Daniel Lieberman proposed that early Homo were scavengers that used stone tools to harvest meat off carcasses and to open bones. They proposed that humans specialized in long-distance running to compete with other scavengers in reaching carcasses[3]. It has been suggested that such an adaptation ensured a food supply that made large brains possible.

Answer 2

It used to be thought that humans only used 10% of their brain. With new techniques of measuring brain waves, etc., that is no longer thought to be the case. More likely, we only use about 10% of the brain at any given time with different parts being used at different times for different tasks. While I'm writing this, I might be using 10% but 90% is waiting in the wings for something else to come along that needs to be tended to.

Answer 3

We use our brain 24/7. The brain is the reason why our body works and other organ too.

Answer 4

It's only a myth that we don't use all of our brain. We do.