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The LSD and schizophrenic experiences are similar in more ways than they are different. The states are phenomenologically similar, but the similarity is contaminated by the fact that no significant differences exist between these two groups and the control group on several measures, if the phenomena in question are regarded as isolated. Significant differences exist between the LSD and schizophrenic experiences, primarily in the affective nature of the experiences and due to the presence of delusions in some schizophrenic states.
Barry G. Young (Tue,) studied this question.