In the name of medical research, scientists analyzed the brain activity of individuals who were in the middle of drug induced hallucinations. The conclusion is that no matter how wacky the trip, the brain activities are identical among subjects.
The narrator of the video sounds a bit paranoid about the subject at times, but some of the visuals (such as at the 1:15 mark) along with the info regarding the actual activity in the brain make him worth tolerating. Either that or the late hour has caused me to hallucinate. [Discover]