In short, there can be different perspectives, broader or narrower, dealing with particular aspects of people - the biological, psychodynamic, societ… - Thaddeus E. Weckowicz

In recent years, the studies of the effects of drugs on the behavior of animals have been playing an increasingly important role. Animal studies have been an advantage over studies with human subjects because better control of experimental variables and a possibility of using a wider range of the doses. It is also permissible to administer toxix compounds to animals. One can interfere surgically with various parts of the central nervous system while investigating the effects of the drugs. The whole field of comparative psychopharmacology has been recently reviewed

During that period von Bertalanffy as a young scholar was not only interested in biology and philosophy of science. He was also interested in history and generally in humanities. He studied Oswald Spengler's theory of history and has written a paper on this topic. His interest in Spengler's theory of history anticipated von Bertalanffy's lifelong attempts to reconcile sciences with humanities.

Ludwig von Bertalanffy, a distinguished biologist, occupies an important position in the intellectual history of the twentieth century. His contributions went beyond biology, and extended to psychology, psychiatry, sociology, cybernetics, history and philosophy. Some of his admirers even believe that von Bertalanffy's general systems theory could provide a conceptual framework for all these disciplines.