Sometimes people can become trapped in the grey zone between conscious and unconscious states. Kerri Smith talks to neuroscientist Adrian Owen about communicating with patients in vegetative states.

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00:00 The grey zone

Sometimes people can become trapped in the grey zone between conscious and unconscious states. Kerri Smith talks to neuroscientist Adrian Owen about his shocking work on patients in vegetative states. Book review: 'Into the gray zone' by Adrian Owen

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