Epistemic Rationality

Epistemic rationality is the capacity to form and revise beliefs in ways that track truth. It is the cognitive counterpart to instrumental rationality: where instrumental rationality asks "what should I do?", epistemic rationality asks "what should I believe?" The normative framework is typically Bayesian — beliefs are represented as probability distributions, and rational updating follows Bayes' theorem.

But epistemic rationality is not merely probabilistic coherence. It includes the disposition to seek evidence that could falsify one's beliefs, to weigh sources by their reliability, and to revise conclusions when the world refuses to cooperate with one's predictions. A belief can be internally coherent and still false; epistemic rationality requires some degree of correspondence to the systems one is trying to understand.

The persistent gap between idealized Bayesian models and actual human belief formation is not merely a bias to be eliminated. It is information about the structure of cognition and the environments in which it evolved.