The increased and increasing plausibility of physicalist view has the effect of eroding commitment to the traditional orthodox view so that there is a tendency towards a shift in the predominant 'root metaphysical model' of man. About the orthodox view of agent action, frankly the author can never convince himself that he have quite grasped the point of such distinctions as that between 'a cause for his action' and 'no cause for him acting'. The thesis of mind-brain identity provides a basis for a coherent and plausible physicalist view of mentality and mind-directed action. What the author have tried to do is to test the physicalist thesis against the best arguments the orthodoxy offers, wherever they are to be found. The 'biperspectival' account of mind–body identity defines the physical domain in terms of communication through external sense.