A fascinating full lecture given years ago in South Africa, Hancock discusses the hallucinations that shamans and others experience drinking AYAHUASA. The plant brew is not something to experiment with at home because the brewing requires special knowledge and should only be imbibed with shaman supervision. Of great interest to me is that people using ayahuasa, no matter what culture they come from, seem to see the same type of vision. And perhaps the UFO abductees are simply people whose brains supply the right stimulant to their pineal gland more naturally.
Stick with this lecture to the amazing anti-TV and anti-War conclusion.
Hancock mentions that a similar state is sometimes achievable through drumming.
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This video is one that I listened to and embedded here on my blog because I think it's worth listening to.