Naturalism or Ontological Significance? Physicalism and Fundamental Mentality: a historical approach

Most physicalists believe that physicalism is a thesis that denies the existence of fundamental mentality either as a substance or as a property. Therefore, since most physicalists also endorse a posteriori physicalism, according to them, if the future physical theory posits fundamental mentality as a fundamental physical concept, then physicalism will be falsified. In contrast, there are those who believe that the core idea of physicalism is an ontological deference to science (especially physics); the idea that is usually called scientism and is closely related to methodological naturalism. According to them, if physicists posit fundamental mentality as an integral part of the future fundamental physical theory, physicalism will not be falsified, and physicalists may (or should) accept fundamental mentality as a genuine physical concept. In this paper, I argue that there is some historical evidence in support of the latter understanding of physicalism. First, I give some historical evidence that seems to suggest that the historical origin of physicalism is the failure of those explanations – or pseudo-explanations – that have appealed to supernatural non-physical entities. Second, I show that in some of the initial reflections on materialism – the predecessor of physicalism – in the first half of the twentieth century, philosophers understood materialism in terms of the very historical origin.