Mike Pensom loves country and western music, particularly anything by Kenny Rogers. He hates hip hop and rap. But recently Mike found that his musical likes and dislikes also have a profound effect on his brain. Twenty years ago Mike had a stroke which caused problems with the left-hand side of his body and left him missing things in part of his field of vision. But when scientists played him his favourite tunes he has seen more - and when they played the stuff he did not like there was no change. "When they played Kenny Rogers for me I was able to spot things that I was not able to see before"