BBC NEWS | Health | Brain size 'not key to intellect'

BBC NEWS | Health | Brain size 'not key to intellect': "Size may not be everything when it comes to brain evolution, say experts.

Instead, UK research reveals that the rising complexity of connections between brain cells may have been the biggest driving force.

The Nature Neuroscience study found clear differences between brain junctions in mammals, insects and single cell creatures.

Changes around half a billion years ago, they said, are likely to have been more important than brain size."