"With the increasing number of sessions I observed, I became more and
more aware that many of the LSD phenomena seemed to have an interesting
psychodynamic meaning and could be understood in psychological terms.
Analysis
indicated clearly that the LSD reaction is highly specific for the
personality of the subject. Rather than causing an unspecific 'toxic
psychosis', LSD appeared to be a powerful catalyst of the mental
processes activating unconscious material from various deep levels of
the personality. Many of the phenomena in these sessions could be
understood in psychological and psychodynamic terms; they had a
structure not dissimilar to that of dreams."
(Stanislav
Grof from the book BEYOND EGO, Transpersonal Dimensions in Psychology,
edited by Roger N. Walsh, M.D., Ph. D., and Frances Vaughan, Ph.D.)