 Often such views are advanced on grounds that are entirely independent of free will or purposive agency, having to do with the nature of causation and causal powers generally. Substance causation that is ontologically fundamental is held to be pervasive, constituting the activity of substances animate and inanimate, macro and micro. Rejection of the view that causation by events or states is uniquely fundamental often stems from a turn away from of a broadly Humean account of causation toward a neo-Aristotelian view, one that takes causal powers to be irreducible features of the world.