  Analytical behaviorism helps to avoid a metaphysical position known as substance dualism. Substance dualism is the doctrine that mental states take place in a special, non-physical mental substance (the immaterial mind). By contrast, for analytical behaviorism, the belief that I have as I arrive on time for a 2pm dental appointment, namely, that I have a 2pm appointment, is not the property of a mental substance. Believing is a family of tendencies of my body.  In addition, for an analytical behaviorist, we cannot identify the belief about my arrival independently of that arrival or other members of this family of tendencies. So, we also cannot treat it as the cause of the arrival.  Cause and effect are, as Hume taught, conceptually distinct existences.  Believing that I have a 2pm appointment is not distinct from my arrival and so cannot be part of the causal foundations of arrival.