Why do we 'choke' under pressure?

The journalist, author and Olympian Matthew Syed reveals what's going on when we mentally crumble in the face of public stress. He tunes into brain waves, and unpicks why some people fare better under the spotlight than others. Ken Clarke's tactic of approaching an interview as a conversation proves to be a winner: 'As soon as you're in conversation, you're unlikely to choke'.

Broadcast as part of Archive Hour: The Choke, Radio 4, Saturday 16 May 2015.