Reason as a Post-Hoc Construct: A Neurophilosophical Analysis of Rationality Without a Central Faculty

This paper argues that what is commonly referred to as “reason” does not correspond to any unified neurobiological faculty. Drawing on contemporary neuroscience, particularly predictive processing and distributed models of valuation and control, it is shown that cognition does not operate under a central rational authority. Instead, behavior emerges from the interaction of multiple context-sensitive systems with no final arbiter. The attribution of rationality is therefore not a property of cognitive processes themselves, but a post-hoc linguistic and social reconstruction imposed on their outputs. This reframing challenges classical assumptions in philosophy of mind and has direct implications for how agency, responsibility, and evaluation are understood.