Wundt
Professor Wilhelm Wundt, a German psychologist and Marxist at the University of Leipzig, proclaimed that mans soul if indeed he had one was irrelevant, as man could only be understood in terms of physically observable phenomena. A search for the spiritual nature of man, he reasoned, was a waste of time as there was no psyche. Thus psychology became the study of the spirit which denied the spirit. The subject of psychology thereafter became prevalent in universities.
Sigmund Freud further reinforced this modern concept of man, arguing that all impulses stemmed from his repressed and uncontrollable sexual desires. Such impulses were then analyzed as primitive and instinctive, not that different from those which drive an animal.
Although Freud himself broke new ground with his recognition that man could overcome physical ills through addressing the mind, the real value of his work was soon buried in a hodgepodge of theories from others.
Pavlov
In Russia, former veterinarian Ivan Petrovich Pavlov served the dictator Stalin with experiments to discover how man could be controlled to better serve the state. He reasoned that if dogs could be made to slaver on command, so could human beings. Man had now been reduced to the level of a mindless animal and thus psychiatry was born, as a tool for tyrannical governments.