H.-P.Haack → [1]
Hans-Peter Haack (born 6 September 1940 in Leipzig / Germany) is a German neurologist and psychiatrist, worked until 2005 in Leipzig and Heidelberg. He defined agitation as obligate depressive symptom, distinct from subclinical agitation to manifest agitation and lifted it to the fundamental distinction between inhibited and agitated depression. For the depression he named four key symptoms that secure the diagnosis: (1) energy deficit, (2) agitation (from subclinical to manifest), (3) disorders of the biological 24-hour cycle, and (4) sadness. Privately collected first editions Thomas Mann's and wrote 2011 photo book with all the first editions by Thomas Mann.