Epoché plays an implicit role in subsequent philosophical skeptic thought, as in René Descartes' epistemic principle of methodic doubt. The term was popularized in modern philosophy by Edmund Husserl. Husserl elaborates the notion of 'bracketing' or 'phenomenological epoché' or 'phenomenological reduction' in "Ideas I". Through the systematic procedure of 'phenomenological reduction', one is thought to be able to suspend judgment regarding the general or naive philosophical belief in the existence of the external world, and thus examine phenomena as they are originally given to consciousness.