Some more info...

What I find particularly suggestive about this course of experimentation is the idea that powerful and unusual altered states of consciousness can be, in a sense, filed away for later use, then activated at will, when necessary or useful. There are also some provocative suggestions concerning the functioning of memory in general, and in relation to all psychedelics. I tend to think that some of the phenomena that has been lumped under the heading "flashbacks" actually might be a memory effect created by the random anchoring and then cuing of an altered state, rather than any permanent biochemical change or damage to the user. To this end, I've made some small, less thorough experiments with anchoring using other psychedelics, with encouraging results.
http://www.hawkridgeproductions.com/phil/xfiles.htm