[Probability in the clinical diagnoses of Pick disease and Alzheimer disease].

This paper is dedicated to the honour of Prof. Dr. Erich Sternberg. The diagnostical strategy of well-known specialists for the Morbus Pick and Morbus Alzheimer is considered. As a result of our own experiences and analyses the psychopathological factors are assigned to the following groups: change of vitality; change of personality; reversible organic psychoses; fuzzy brain-local symptoms; development of dementia. For these groups growth curves are given for which the analytic description by a special type of a differential equation, is used. The different behaviour of the development of the dementia to the Morbus Pick and Morbus Alzheimer is found.