 Meyer put forward a mixed social and biological framework emphasizing "reactions" in the context of an individual's life, and argued that the term "depression" should be used instead of "melancholia".The DSM-I (1952) contained "depressive reaction" and the DSM-II (1968) "depressive neurosis", defined as an excessive reaction to internal conflict or an identifiable event, and also included a depressive type of manic-depressive psychosis within Major affective disorders.In the mid-20th century, other psychodynamic theories were proposed.