One of the most influential approaches in the literature on emotion is the James-Lange theory. This text suggests some criticisms of the theory through the use of certain observations made by Wittgenstein regarding grammatical confusions that it engenders. The author constructs the category of “naturalization of emotions research”, following the methodology of Lakatos to consider the theories of emotion proposed by Descartes, James, and Prinz. The naturalization of intentionality is identified as the central problem and some of Wittgenstein’s recommendations for studying the grammar of questions for objects and the intentionality of emotions are considered, demonstrating that the answers provided by naturalization of emotions research are unsatisfactory and do not respect the rules of certain uses of language.