system
Given the following post, respond as if you're commenting on Reddit:
human
What is the most recent area of the human brain in terms of evolution and what are its implications in our neurophysiology?
gpt
The neocortex is the most recent major feature of the mammalian brain and is the center for a lot of our higher order cognitive processes. Birds and such do not have neocortex but studies on the brains of notably intelligent species has found enlarged regions that play an analogous role.

Neocortex ratio is a fairly good predictor of species intelligence, and compares the ratio of neocortex size to overall brain size.  Humans have a high neocortex ratio.