I. The decisive turn in Husserl's philosophy, which occurred a few years after the publication of the Logical Investigations (1900–1901), is characterized by the term "epoché." Husserl himself conceived of this turn as a withdrawal from phenomenology as descriptive psychology, in the sense of an analysis of the mental processes of empirical consciousness. Subsequently, he called for a transcendental phenomenology which seeks to clarify the conditions of the possibility of the empirical knowledge of being and, eventually, disclose the sense of being and existence as such.