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Consulting California's 'virtual shrink'

Scientists in California have developed what is being called a "virtual shrink", a computer program which interacts with patients who might be depressed or soldiers who might be suffering from post-traumatic stress disorder.

The on-screen avatar asks all the right questions and reacts to the answers to objectively analyse the patient to see how they are doing.

The BBC's correspondent Alastair Leithead reports from California.

First broadcast on BBC Radio 4's Today programme on Thursday 30 May 2013.