Phillip Garrido was given a prison sentence of 431 years in June, while his wife was jailed for 36 years to life, after the pair agreed a plea bargain over the crimes which shocked America and the world.

Dugard, whose book about her ordeal "A Stolen Life" is published this week, said the process of recounting her ordeal in full, harrowing detail has helped liberate her mentally.

"Why not look at it? You know, stare it down until it can't scare you anymore," said the 31-year-old. "I didn't want there to be any more secrets...I hadn't done anything wrong.

"It wasn't something I did that caused this to happen. And I feel that by putting it all out there, it's very freeing," she added in the interview, according to extracts released before its broadcast Sunday evening.

She describes the moment she was kidnapped, while walking to school from her home in South Lake Tahoe, California on June 10, 1991 as "like the most horrible moment of your life times ten."

Describing how she coped with the repeated rapes to which she was subjected, she said: "There's a switch that I had to shut off."

"I mean, I can't imagine being beaten to death, you know? And you can't imagine being kidnapped and raped, you know? So, it's just, you just do what you have to do to survive."

She recalled her rescue in August 2009 -- when Garrido took her and her two daughters with him to a parole meeting, and Dugard initially maintained the fiction that she was the Garridos' daughter.

But parole officers were suspicious, and she eventually confirmed her identity by writing down her real name -- an act she likened to re-igniting a flame which had been extinguished.

"The light came back ... it was very dark for so long ... but that light finally came back on," she said.