Abstract
“According to [Bayesian] models” says a recent textbook in cognitive neuroscience, “the human mind behaves like a capable data scientist”. Do they? That is to say, do such models show we are rational? I argue that Bayesian models of cognition, perhaps surprisingly, do not and indeed cannot, show that we are Bayesian-rational. The key reason is that they appeal to approximations, a fact that carries significant implications. After outlining the argument, I critique two responses, seen in recent cognitive neuroscience. One says that the mind can be seen as approximately Bayes-rational, while the other reconceives norms of rationality.
