The most common monisms in the 20th and 21st centuries have all been variations of physicalism; these positions include behaviorism, the type identity theory, anomalous monism and functionalism.
De vanligaste monistiska positionerna under 1800- och 1900-talet har varit varianter av fysikalism; dessa positioner innefattar behaviorism, identitetsteorin, anomal monism och funktionalism.