The author, largely from a clinical standpoint, discusses the various ideas of negation. He points out that ideas of negation, systematic or asystematic, are very slow in appearing, and represent generally a phase of evolution of the psychoses or a secondary mental process. Their appearance coincides with the mental decadence due to chronicity or associated with senility. Certain congenital cases do not come under this class, and there is also a group in which there seems to be a “negative disposition” of the individual. From a clinical study one of the following factors is necessary to the production of these ideas: (1) a state of mental weakness produced either by an intoxication or by some other cause acting acutely, or (2) a state of acute, subacute, or chronic pathological pain, or (3) an originally degenerative condition.
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