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It's an experience we've all had - desperately trying to recall a word that's on the tip of your tongue. You might know the letter it begins with, the letter it ends with, but it just won't pop into your head. Psychologist Dr Meredith Shafto helps to explain what's going on in our brains and how we can aid recall with Michael Rosen and Dr Laura Wright. First broadcast on Word of Mouth, 1 March 2016.