However, if there is a way to (almost) immediately verify the information, does torture work then? If you have, say, a safe in the same room as the person you're torturing and you know they know the code, and you can try the code immediately. Is torture effective in that scenario and similar scenarios, where you can verify the information and then continue the torture if you were lied to?
I know one thing:
If I would have to extract information from an average person ( not some sort of medieval-religious-martyr-fanatic-type ), and i would have one week, and a this kit:
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It would not be a question of intensity of pain, it would be a question of finally ending the agony of a biological mass, that was "a person" at some point far far away, in another galaxy...
Although, there might be few well trained, astronaut level of psychological stability individuals, who might be able to go in a "meditation mode", and just keep screaming like animal for the whole duration, until their brain would give up, or keep repeating well learned misinformation. But even then, there might be a surgical way of removing the parts of the brain, that are responsible for control of certain processes, that would turn a human into a vegetable, without damaging their speech and memory.
EDIT:
Now, after re-reading what i wrote, i admit that it sounds a bit too edgy... Well, I am not an "evil" guy, but i have seen one of my close family members turning into a vegetable in a duration of few years time ( desease + medication ), i know from a personal experience, how much one's brain effects one's personality - so I presume, that what we call "reason", "logic" and "willpower" is close to NOTHING, against the biology and "forces of nature"... As sad as it is, there must be only this much a brain can take, afterwards it is ... hard even to describe.. but not human anymore