Claiming there are 200 points that are wrong, he writes, “I must honestly admit that this is the worst thing that could have happened to me. It’s the ultimate humiliation.”

Breivik believes the initial court-appointed experts were emotionally affected by the July attacks in which 77 people died, claiming that was why they concluded early on that he might be psychotic.

“Sending a political activist to a mental hospital is more sadistic and crueller than killing him. It’s a fate worse than death,” Breivik declares in the letter.

Other specialists who have seen the letter back Breivik’s belief that he is not psychotic.

Arne Thorvik told VG, “Psychosis is characterised not only by obvious content, but a conspicuous form. Breivik’s letter is structured, with simple sentences that are straightforward to understood, even if the message is alien to most people,” he said.

Psychiatrist Henning Værøy also believes that Breivik was wrongly diagnosed and supports Mr Thorvik’s views.

Mr Værøy believes that the structure and arguments made in the letter are too clear to have been written by someone suffering with paranoid schizophrenia.

“I see no signs of psychotic illness here, but rather the outline of a person who lacks the identity he wants to have. [I see] a misunderstood narcissist that no one has seen before the 22nd July.”

The new assessment by experts Terje Tørrissen and Agnar Aspaas to be presented after Easter will be decisive for Breivik's trial should all four psychiatrists agree on his present diagnosis.

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