Will Self on London cab 'knowledge'
23 March 2013 Last updated at 10:41 GMT
Author Will Self has been involved in a project looking at the effects on the brain of learning The Knowledge - the street memorisation training that black cab drivers have to undertake.
Will Self details his experiences and Hugo Spiers, neuroscientist at University College of London, explains the research.
First broadcast on BBC Radio 4's Today programme on Saturday 23 March 2013.