Researchers are putting their best efforts to thoroughly understand the working of brain and more precisely a previously inaccessible part of the brain to learn some more related facts and findings, which they hope could help them understanding autism, ADHD and depression better.

In their latest writings published in the Proceedings of the National Academy of Sciences, scientists have mentioned that their recent findings have reached them closer and clearer to understand the working of brain cells and how actually the brain switches from being internally focused and remains its entire focus on a task in the outside world.

The research was done by the team of researchers from Stanford University under the guidance of Professor Josef Parvizi. While studying the posteromedial cortex (PMC), an earlier inaccessible region of the cortex, researchers noted it buried deep under the crack between the brain's two hemispheres.

"It's an area that's extremely active when the brain is resting", says Mr. Parvizi, who said that the maximum research was performed by an Australian post-doc, Dr. Brett Foster.

Explaining that the brain is still thinking even when a person is not actively concentrating upon a single task, he said "The PMC is the hub of all these rumination processes."