  The tradition of analytic philosophy began, early in the 20th century, with analyses of language, notably in the works of Gottlob Frege, Bertrand Russell, and Ludwig Wittgenstein. Then in The Concept of Mind (1949) Gilbert Ryle developed a series of analyses of language about different mental states, including sensation, belief, and will. Though Ryle is commonly deemed a philosopher of ordinary language, Ryle himself said The Concept of Mind could be called phenomenology. In effect, Ryle analyzed our phenomenological understanding of mental states as reflected in ordinary language about the mind. From this linguistic phenomenology Ryle argued that Cartesian mind-body dualism involves a category mistake (the logic or grammar of mental  verbs—“believe”, “see”, etc.—does not mean that we ascribe belief, sensation, etc., to “the ghost in the machine”). With Ryle’s rejection of mind-body dualism, the mind-body problem was re-awakened: what is the ontology of mind vis-à-vis body, and how are mind and body related?