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There is an old joke that talking to yourself is first sign of madness but we now know its an essential mental tool. So how much of what we do online is that same inner speech? Professor Charles Fernyhough tells Aleks Krotoski about his research about inner speech, the benefits of talking to ourselves and shares his thoughts on how technology can augment this little understood part of human nature. First broadcast on The Digital Human, 1 May 2017.