Categorization... Natural Language and Design

It is significant that the human brain is far larger than that of any other animal. Humans, in fact, also have a higher ratio of brain-tobody weight than other animals. Unlike other animals, humans have a sizable portion of their brains uncommitted to sensorymotor functions, and consequently a considerable amount of brain mass is available for higher mental processes. This large uncommitted area in the human brain offers a seemingly unlimited capacity to store symbols for objects and events of the environment.