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The declassified document dates back to 1983 and details the CIA’s Gateway Process.

In it, subjects would try to better control their own brainwaves using meditation techniques and reach higher levels of consciousness.

The agency’s efforts apparently had incredible results – with certain subjects able to reduce the growth of tumours.

It was hoped the information could be passed on to government and military personnel – and eventually the public.

(Image: DS/GETTY)

However, the documents have been kept in the dark until this year.

The ground-breaking results were supposedly achieved through hypnosis, transcendental meditation and a technique called “biofeedback”.

In the last process, the subject is meant to focus on specific parts of the body and conjure positive thoughts.

The study reads: “If the subject wishes to increase the circulation in the left leg in order to speed up healing he may concentrate with his left brain on achieving that result while carefully monitoring a digital thermometer connected to the left leg.”

(Image: CIA)

Those who succeeded registered an increase in temperature.

The study continues: “The subject can mentally (left brain) associate the sensations experienced with the result achieved and can begin to emphasise, by memory recall, the same process to cause its strengthening by affirmation and repetition.

“In this way, pain can be blocked, healing can be enhanced, malignant tumours can apparently be suppressed and ultimately destroyed, the body’s pleasure centres can be stimulated, and a variety of specific physiological results may be achieved.”

One conspiracy theorist who studied the documents blasted the CIA for taking so long to release the information.

(Image: GETTY)

Anjel Gutierrez said: “This is proof that we can heal ourselves and that to me is the craziest, most amazing discovery

“This is what they should have been teaching us since they were babies and it almost brings tears to my eyes.

“I will use my brain to heal myself and use different things that might help.

“You can use your brain to heal any pain that you have and if you keep doing it through repetition and positive affirmation then you can do it.”

Last month, shock CIA documents suggested that Nazi leader Adolf Hitler was alive more than 10 years after World War 2.

Unsealed documents from the spy agency reveal a US agent was told by a “trusted” source that the Third Reich boss was not dead and hiding out in South America.

The suspected Hitler’s picture was even presented to the agent, scanned and sent back to the CIA.

Thousands of files on John F Kennedy’s assassination were also released on President John F Kennedy’s assassination, amid claims the CIA ordered the killing.