Phenomenology—A modern development in European rationalism. Its most famous exponents are Franz Brentano (1838-1917), Edmund Husserl (1859-1938), Martin Heidegger (1899-1976), Jean-Paul Sartre (1905-1980) and Maurice Merleau-Ponty (1908-1961). Phenomenology investigates consciousness through experience. Some of its theories are reminiscent of Vedic knowledge, for example, the theory of the triumvirate of consciousness: the knower, the act of knowing, and the thing known. In Vedic terminology, these are jñātā, jñāna, and jñeya. See Mind/body problem, Rationalism.