Peter Sarsgaard believes acting has helped him to become "a more fully evolved person"

Speaking to the Observer newspaper, Peter shared: "I lived with a lot of very sensitive people.

"Mental illness was a real thing in my house. Around those people, in those types of potentially volatile situations, you want to keep everything chill. And I'm very good at it.

"I spent a lot of my time as a kid trying to read the minds of people who didn't know their own minds. It's a skill I developed. I'm frequently thinking about what other people are thinking."

Peter believes he's actually developed the ability to "tell when people are lying".

The Hollywood star added: "It doesn't necessarily mean I have a problem with them - it turns out people lie often. It's more like information to me. I go, 'Oh, what would make them lie about that?'"

Peter - who is married to actress Maggie Gyllenhaal - received lots of support from his extended family during his younger years.

Asked in what way mental illness was present in his childhood home, Peter replied: "Oh, I'd rather not say. But it was very much around me, all the time, 24/7.

"You know, I was supported in many ways as a kid, also. Everyone in my extended family was thinking about my welfare.

"Even to this day, I have these three female cousins ... One of them thought that if she pet me enough, like, on the head, that it would make be a better person."