Viggo Mortensen
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Viggo Mortensen on playing Sigmund Freud in his new film

3 February 2012 Last updated at 16:19 GMT

Viggo Mortensen stars as Sigmund Freud opposite Michael Fassbender's Carl Jung in A Dangerous Method.

The Lord of The Rings actor told Radio 5 live's Simon Mayo how David Cronenburg offered him the part and why he bought a number of the props used in the film.

A Dangerous Method clips courtesy of Lionsgate Films. The movie is released in the UK on 10 February.

Simon Mayo and Mark Kermode broadcast Fridays 14:00 to 16:00 on BBC Radio 5 live. To hear other 5 live interviews, please visit the best bits page.