How does the brain create consciousness?

Ahead of a debate on the nature of consciousness at the Royal Institution on Wednesday 7 March – Consciousness: The Hard Problem? – Alok Jha interviewed the protagonists for the Guardian’s Science Weekly podcast: Dr Anil Seth, co-director of the Sackler Centre for Consciousness Science at Sussex University; Professor Chris Frith, professor emeritus at the Wellcome Trust Centre for Neuroimaging at University College London; and Professor Barry Smith, director of the Institute of Philosophy at the School of Advanced Study, University of London.