“Extreme psychotic states offer a human parable … patients see into the depths which do not belong so much to their illness as themselves as individuals with their own historical truth … in psychotic reality we find an abundance of content representing fundamental problems in philosophy …. The philosopher in us cannot but be fascinated by this extraordinary reality and to feel its challenge.” (Jaspers, 1963)
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Glenn Roberts (1991) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: