What motivates mental fictionalism?

Mental fictionalists propose that we should continue to engage in truth-conditional discourse about the mind, even though we have reason to believe that the discourse lacks truthmakers. In Mind As Metaphor, Toon attempts to motivate mental fictionalism with two arguments, one negative and one positive. Toon’s negative argument is that there are no internal mental states with intentional and causal properties, and therefore there are no truthmakers for the standard interpretation of our everyday folk-psychological discourse. This paper challenges Toon’s negative argument by arguing that a commitment to internal mental states does not require a commitment to the representational theory of mind. Toon’s positive argument is that engaging with the discourse as form of pretense or make-believe enables us to make sense of the relation between mind and behavior in a way that other nonrepresentational interpretations of the discourse cannot. This paper argues that Toon’s positive argument undermines rather than supports his case for mental fictionalism, as it seems to ontologically commit him to the types of mental states he is trying to deny.