United Kingdom, Jan. 26 -- Kanye West is "deeply mortified" by his anti-Semitic actions.

The Stronger rapper came under fire last year over his controversial behaviour, including praising Adolf Hitler and selling t-shirts emblazoned with a Swastika, a notorious Nazi hate symbol, but he's now taken out a full-page advertisement in the Wall Street Journal in the form of an open letter, in which he explained he "lost touch with reality" amid a lengthy manic episode.

He wrote about his experiences of bipolar disorder: "The scariest thing about this disorder is how persuasive it is when it tells you: You don't need help. It makes you blind, but convinced you have insight. You feel powerful, certain, unstoppable.

"I lost touch with reality. ...