Anti-reductionist philosophers have often argued that mental and linguistic phenomena contain an intrinsically normative element that cannot be captured by the natural sciences which focus on causal rather than rational relations. This line of reasoning raises the questions of how reasons could evolve in a world of causes and how children can be acculturated to participate in rule-governed social practices. In this paper I will sketch a Wittgensteinian answer to these questions. I will first point out that throughout his later philosophy Wittgenstein draws a sharp distinction between "teaching" and "training": newly-born children are (conditioned) to react to specific stimuli in specific ways, which then allows them to acquire concepts and follow rules. I will then show that this picture presupposes a strong analogy between concepts and capacities, which is also present in Wittgenstein's later philosophy. In the last section I will point out that Wittgenstein only discusses the ontogenetic question of how individual children can acquire speech, but not the phylogenetic question of how rule-governed behavior could evolve in the first place. I will argue that this strategy should not be seen as a shortcoming, but rather as an expression of Wittgenstein's approach that can be characterized as naturalistic in a wide sense.

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I address the question of whether naturalism can provide adequate means for the scientific study of rules and rule-following behavior. As the term "naturalism" is used in many different ways in the contemporary debate, I will first spell out which version of naturalism I am targeting. Then I will recall a classical argument against naturalism in a version presented by Husserl. In the main part of the paper, I will sketch a conception of rule-following behavior that is influenced by Sellars and Haugeland. I will argue that rule-following is an essential part of human nature and insist in the social dimension of rules. Moreover, I will focus on the often overlooked fact that genuine rule-following behavior requires resilience and presupposes an inclination to calibrate one's own behavior to that of the other members of the community. Rule-following, I will argue, is possible only for social creatures who follow shared rules, which in turn presupposes a shared (firstperson plural) perspective. This implies, however, that our scientific understanding of human nature has to remain incomplete as long as it does not take this perspective, which prima facie seems alien to it, into account.