The papers compiled in this supplementum are a selection of the best con th tributions presented at the 19 Central-European Neurological Symposium (CNS 19) held on June 29 - July 1, 1989 in Vienna. The main topic of this conference was degenerative and age-associated neurological diseases. In recent decades life expectancy has dramatically increased, at least in the industrialized countries. This has led to extreme distortions of the so-called population pyramids that no longer look like such but begin to almost resemble cylinders. As a consequence of this "overaging" of the population,...