Iain McGilchrist has written an important book The Master and his Servant which is simultaneously a hugely informative review of research on left and right hemispheres of the brain and a profound critique of the diminished role of the imagination as a vital part of intelligence.   Here he gives a wonderfully clear account of his thesis in a fabulous animated cartoon,  hilarious and profound.

http://www.confer.uk.com/mcgilchrist.html