Trio win medicine Nobel for brain 'GPS'

Three neuroscientists have won the Nobel Prize for Medicine for their discoveries of how rats determine where they are and how they move through space.

Half the award has gone to John O'Keefe (pictured), professor of cognitive neuroscience at University College London, whose initial discoveries had "a dramatic impact on the study of how the brain creates behaviour", the Nobel committee said.

The other half is shared by married Norwegian couple May-Britt Moser and Edvard Moser, whose work follows 30 years after O'Keefe’s. They found how activities in so-called grid cells allow the brain to