Rarely does the mind get blown by something which is literally capable of blowing the mind. This qualifies: Researchers have been able to induce lucid dreaming at will with gamma waves. Even in this initial article, they're already talking about using this technique to hack the psyche. Check it out:
Voss and her colleagues therefore asked, if gamma waves occur naturally during lucid dreaming, what would happen if they induced a current with the same frequency as gamma waves in dreaming brains? When they did, via electrodes on the scalp in a technique called transcranial alternating current stimulation tACS, the 27 volunteers reported that they were aware that they were dreaming. The volunteers were also able to control the dream plot by, say, throwing some clothes on their dream self before going to work. They also felt as if their dream self was a third party whom they were merely observing. Voss does not foresee a commercial market in lucid-dreaming machines. Devices currently sold "do not work well," she said in an interview, and those that deliver electrical stimulation to the brain, like the one in her study, "should always be monitored by a physician." But if the results hold up, the technique might help people suffering from post-traumatic stress disorder, who often have terrifying dreams in which they re-play the traumatic experience. If they can dream lucidly, they might be able to bring about a different outcome...