How did paleoanthropus differ from neoanthropus? What was the significance of these differences?

Peleoanthropus was still a rather primitive creature that possessed small rudiments of intelligence. They had no social organization. They were still very much like animals.
The neoanthrope was already a man of a new type, who was an intelligent creature. He learned to cultivate the land and raise livestock. There was also a public organization. The first settlements were founded, etc.