The concept of neurotic depression was introduced in the early part of the 20th century. The concept has undergone many revisions, and recently was discontinued as a category in the DSM-III. In the past, neurotic depression was referred to as a nonpsychotic form of depression, a nonendogenous depression, as well as many other categories. The presence of various meanings has made it difficult to develop algorithms for neurotic depression; the findings substantiate the decision of the DSM-III not to continue the category of neurotic depression.
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Gerald L. Klerman (2010) studied this question.