Here's the introduction to a piece in New Scientist today:
EVEN the most sophisticated electronic security can be defeated by forcing someone to reveal a password. But what if sensitive information could be stored in your brain in such a way that you couldn't consciously disclose it, no matter how hard you tried?
The rest is less flashy but still interesting. I say it has Manchurian Candidate undertones because a person could potentially "know" an important password without realizing it.
The piece summarizes work in a new paper by Hristo Bojinov et al. entitled, Neuroscience Meets Cryptography:Designing Crypto Primitives Secure Against Rubber Hose Attacks.