Michael Gazzaniga: Split brains and other heady tales

One of the big names of the brain is Michael Gazzaniga, whose career was forged in the lab of Nobel laureate Roger Sperry. His striking experiments continue to uncover the differences between your left and right hemispheres. Today he's on the US President's Bioethics Council, heads up a major project on neuroscience and the law, and is a prolific writer of popular neuroscience. He joins Natasha Mitchell to reflect on the brain's left and right, and the mysterious nature of free will.