Responsible Agents and the “truth” about Their Future States

In the posthumously published Behind the eye, the late D.M. MacKay gave the definitive statement of his position on determinism and responsibility. This position relies heavily on two basic insights: first, a prediction of a human being's future states is not accurate if the subject of the prediction believes it; second, a proposition is true only if some agent's ability to exert control depend; upon the accuracy of the proposition. In this essay, I develop an argument for the incompatibility of determinism and responsibility, as well as a counter argument which takes advantage of the preceding two insights. Next, I clarify MacKay's conception of truth and apply it to these arguments. Lastly, I defend MacKay's position against three possible criticisms.