Eddie Redmayne suffers from "persistent fear" on set.
'The Danish Girl' actor - who is up for an Oscar on February 28 for his performance as transgender pioneer Lili Elbe - says he struggles with nerves off camera, but as soon as shooting commences he feels "free".
He said: "I suffer from a more complex, persistent fear. It manifests itself in nerves, and on film the camera sees even the tiniest evidence of this. So you have to learn that when the director calls action, you don't go to this place of tension but somehow you become free."
Meanwhile, the star, who won an Academy Award last year for his portrayal of Stephen Hawkings in 'The Theory of Everything', also has a habbit of googling reviews, and taking note of the negative comments to try to iron out any issues with his performance.
He told the Daily Telegraph: "What you remember is the bad stuff that gets written. Because one remembers that, it galvanises you to keep working to prove to yourself that you are not those things. Some people say Stephen Hawking was a technical performance. OK, well, playing it felt very emotional to me. So clearly something isn't right. So you take that criticism and try to work harder."