Reviewing briefly the work of Kahlbaum, of Hecker, of Finch, Kraepelin, etc., on the subject of katatonia, Seglas insists on the importance of differentiating the affection katatonia proper from the katatonic state, the neglect of which accounts for a good deal of difference of opinion on the question. The conclusions of Finzi and Vedrani, in the present state of our knowledge, appeal to him most: (1) The syndroma katatonia is observed more or less pronounced in many mental diseases. (2) It never constitutes alone the clinical picture; it is not the whole of the disease, but only occupies certain phases of the morbid process. (3) It is most complete and most lasting in cases of juvenile dementia which have a good deal of analogy with hebephrenia. But it is most important to be clear and precise as regards the essential features of katatonia. According to some authors it is synonymous with tonic spasm of certain groups of muscles; the general opinion among French alienists is that katatonia denotes the cataleptiform states in the insane. These views are not comprehensive enough.
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