The previous chapters presented models of mental illness that were based on the biological, behavior, and the social sciences. Although in the past t… - 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.

Von Bertalanffy also studied the works of , a neo-Platonist Renaissance philosopher, on whom he wrote a book. Cusanus, who had a lasting influence on von Bertalanffy, may be regarded as a precursor of general systems theory. Nicholas of Cusa rejected Aristotelianism dominant in theology and philosophy at the end of the middle ages and adopted neo-Platonist ideas and even went back to the philosophy of , a pre-Socratic philosopher. Anaxogoras said that 'everything was everything else.' Therefore all categories of thinking were relative and all contradictions only apparent. According to Cusanus the knowledge of infinite God cannot be grasped by human mind it can only be approached from different directions. The idea of God has many aspects which appear to be contradictory. It is similar to a human face which may present different appearances when perceived from different perspectives.