The actor, who won a Golden Globe for his role as Dicky Eklund in The Fighter, told The Mirror that despite comparisons to Robert De Niro and Daniel Day-Lewis, his portrayals are a result of 'winging it'.
Bale explained: "I'm not having therapy. It's very limiting if I have to relate every damn thing in somebody else's life to something that’s happened in mine. At the end of the day, I'm faking it. Pure imagination.
"I never took any classes, I just go, 'I better wing this one and make it up!' Everybody talks about the process too much. The interesting thing about a movie is the movie."
He added: "The more I talk about it, the more I'm telling people how to react. I want to talk, but I try not to show too much of myself."
> Bale: 'Being a star is embarrassing'