The "Diagnostic and Statistical Manual" of the American Psychiatric Association,2 which in a sense is an official catalogue of definitions, classifies depersonalization as one of the various symptomatic expressions of personality disorganization found in the category called Dissociative Reaction. In this category, along with depersonalization, are such disorders as amnesia, fugue states, and somnambulism. The "Manual" goes on to say that, although these disorders are often serious and may sometimes even appear to be psychotic, they are all neurotic and must be differentiated particularly from schizophrenia.Textbooks on psychiatry contain only meager mention of depersonalization. Bleuler's text,1 for example, refers to depersonalization only twice, and then in but a sentence or two. Kraepelin4 describes the disorder very briefly as a common finding in mild depressions. Of the modern texts, Noyes'5 gives perhaps the best account of it.Journal articles on depersonalization are not very numerous.
BIRD B. Depersonalization. AMA Arch NeurPsych. 1958;80(4):467-476. doi:10.1001/archneurpsyc.1958.02340100067017