Confessed mass killer Anders Behring Breivik has criticised a psychiatric report declaring him insane as being based on "evil fabrications" meant to portray him as irrational and unintelligent.

"It is not me who is described in that report," said Breivik who admitted to killing 77 people in bomb and shooting attacks on July 22 last year, said in court on Wednesday.

Sounding irritated, the 33-year-old Norwegian accused the two psychiatrists who declared him psychotic of deciding on the diagnosis prematurely, saying their judgment was clouded by their emotional response to the attacks.

Al Jazeera's Nick Spicer reports from Oslo.