[What should epistemology contribute to psychiatry in the era of interdisciplinary research ?].

The author shows it is necessary to perform a critical and logical study of the sciences in order to understand better the origin and the development of the multiple aspects of psychiatry. He introduces the work of a philosopher of science, Pr L.-J. Delpech, who points out the rupture between classical and contemporary scientific thinking in an article on "The new epistemologies". P. Marchias recalls that some of them have played an important role in his own work. They have permitted him to renew his mode of observation and to found a new effective method for organizing his knowledge and his daily clinical activities. Thus he can testify the theoretical and practical effects of epistemology in psychiatry.