Canguilhem defines "scientific ideology" as the discourse that precedes a science in the process of foundation that itself relies on an existing science whose methodology and suppositions it emulates. In its aspiration to become a science, the discourse acquires the character of a "scientific ideology." It is in the nature of this ideology to form an epistemological obstacle, but simultaneously through the problems and criticism it raises, the discourse forms the impetus to found the new science, which dislodges this ideology and does not entirely appear in the place the ideology indicated, but rather appears displaced.