A preview of the Human Mind page:
And the mammalian brain became the human brain by adding the massive grey matter (neocortex) which envelopes most of the earlier brain and amounts to about 85 per cent of the human brain mass.
This massive addition consists mostly of two hemispheres which are covered by an outer layer and interconnected by a string of nerve fibres.
The brain is actually divided into its 'hemispheres' by a prominent groove. At the base of this groove lies the thick bundle of nerve fibres which enable these two halves of the brain to communicate with each other.
Continued on the Human Mind page...
