If the prisoner managed to maintain a shred of internal integrity, the guards would invite the homosexual trustees into the prisoner’s cell to annihilate his ego with repeated rape. No one emerged from Seclusion unchanged.
The consummate evil that French government had done to punish its enemies was later reproduced by the psychological community when they invented a technique in the name of science that would totally isolate their test subjects from the outside world. The psychologists (many of them under government contract it has to be admitted) devised a means to separate a human from sensory influences. They built heavily insulated, sound-proofed, salt-water filled, light-tight tanks and let their subjects float aimlessly on water that was held at the precise temperature of a human body with neither sound nor light to stimulate the nerves.