Paragraph 2
Dr Mithen explains how he believes
speech developed so long
in his new book called, "The Language Puzzle". He says our brain
increased in
just over 1.5 million years ago. This increase changed the structure of our brain. An
called the frontal lobe developed. This is the part of the brain that produces language. Another important
was the development of our
tract. This is where we produce sound, and therefore speech. Mithen said speech allowed humans to spread around the
. It meant humans could do three important things. They could think of and plan future
, and they could pass on
. Mithen said language "changed the human story profoundly".
