Wundt, in his Physiologische Psychologie, declares: "as a matter of fact we ourselves may in dreams experience almost all the manifestations which we observe in the asylums for the insane."

冯特在其《生理心理学》中写道：“事实上，我们在梦中能够体验到精神病人在疯人院里几乎所有的病症。”