—Placing subjects in a quaking rubber room to produce overanxiety and emotional instability. The CIA review says "for our purposes a quaking room is too much of a torture chamber; however, if some third-degree approach is contemplated at a permanent installation, this one is interesting."

—Shining flickering lights at a prisoner. "The analyst ... mentioned watching a restaurant fan which was too slow, but nevertheless spoiled his appetite."

—Injecting forms of cocaine into a suspect's brain through holes in the skull. "Too surgical for our use."

—Odors were also considered. The documents said that terror has been produced by exposing a subject to a harmless odor, such as geranium, simulating the smell of a lethal gas.