ABSTRACT
An ideology simplifies the distinction between the method as well as a finer distinction between the discoveries of that time and all the subsequent "discoveries" Freud's posteriors could make from the subsequent, present-day developments, derived from that method. Freud formulated a general theory of the functioning of the mind by hypothesising an explanation of his discoveries with the scientific cognitions of his time: this is what was defined the Energy-drive Theory, presented in his On Metapsychology. This theory characterised psychoanalysis for one hundred years and still does despite the fact that the general scientific panorama and the knowledge acquired by psychoanalysis has changed. Ideologies are expressed at level of the unconscious collective thought; often disowned at the level of individuals, they take the form of a climate, almost an "enactment" within a community, embodied in its procedures, regulations, habits, type of literature. The invention was necessary to describe what was being discovered using certain instruments, in this case the microscope.
