The US's top psychology association colluded with the Pentagon and the CIA to devise ethical guidelines to support interrogation techniques used after the September 11 attacks that have since been labelled as torture, a report says.

The American Psychological Association sought to "curry favour" with defence officials by issuing an ethics policy in line with government interrogation techniques post 9/11, such as waterboarding and sleep deprivation, the report commissioned by the body's board found.

The association colluded with several government agencies, including the Pentagon and the Central Intelligence Agency, to devise ethical guidelines for the interrogation program under former president George W Bush, according to the 542-page review released on Friday.

The government agencies "purportedly wanted permissive ethical guidelines so that their psychologists could continue to participate in harsh and abusive interrogation techniques being used by these agencies after the September 11 attacks," the report said.

"APA's principal motive in doing so was to align APA and curry favour with DoD (Department of Defence). There were two other important motives: to create a good public-relations response, and to keep the growth of psychology unrestrained in this area."

The findings come after Democrats on the US Senate Intelligence Committee in December released a damning report detailing brutal previously unknown interrogation techniques, including beatings and rectal rehydration, used by the CIA on Al-Qaeda suspects post 9/11.

Responding to the findings, the APA said Friday it would review its policies and urge a ban on its psychologists from participating directly in interrogations.

"The organisation's intent was not to enable abusive interrogation techniques or contribute to violations of human rights, but that may have been the result," said Nadine Kaslow, who led an independent review committee that commissioned the report.

"We profoundly regret, and apologise for, the behaviour and the consequences that ensued."

The independent review led by lawyer David Hoffman of Sidley Austin law firm, was commissioned by APA's board of directors and took seven months to complete.

The comprehensive report said that in 2005, the APA created a task force to review the association's ethical guidelines that determined when its psychologists could participate in interrogations.

A subsequent report from the task force found there were no ethical violations of psychologists' participation in the government's "enhanced interrogation" program - which included techniques such as waterboarding, forced "stress positions" and sleep deprivation.

-AAP