Looks like the researchers in the UK beat me to it, but this is research I hope to do in the future.
Originally posted on Health & Family:
(Updated) More than half a century ago, author Aldous Huxley titled his book on his experience with hallucinogens The Doors of Perception, borrowing a phrase from a 1790 William Blake poem (which, yes, also lent Jim Morrison’s band its moniker).
If the doors of perception were cleansed, every thing would appear to man as it is, infinite. For man has closed himself up, till he sees all things through narrow chinks of his cavern.