The human mind presents itself as an object of study which dovetails a rational and a physical nature. Victor M. Verdejo examines in this book both dimensions of the mind by elucidating the distinctive and common features of a genuinely philosophical and a genuinely empirical approach. The target philosophical theory, based upon neo-Fregean developments, is the one that constitutively appeals to the notion of rationality and that works within what is called the Rationality Framework (RF). The target empirical theory, celebrated in cognitive science, is the Language of Thought Hypothesis...