Dissociating visual perspective taking and belief reasoning using a novel integrated paradigm: A preregistered online study.

There is considerable conceptual overlap between Level-2 Visual Perspective Taking (VPT-2) and Belief Reasoning; both cognitive processes require us to represent another's viewpoint and experience of reality while inhibiting our own egocentric representations. This study investigated if these facets of mentalising are distinct from one another in the general adult population. To do so, we developed a novel "Seeing-Believing Task" with which to compare VPT-2 and true belief (TB) reasoning directly - one in which both judgement types refer to the same state of reality, requiring identical responses, and where self and other perspectives can be dissociated. Across three preregistered online experiments, this task demonstrated consistent differences between these two cognitive processes; specifically, TB judgements were associated with slower response times than VPT-2. This suggests that VPT-2 and TB reasoning are at least partly distinct psychological processes. Further, the greater cognitive effort required for TB reasoning is unlikely to be explained by differences in mnemonic processing. We suggest, therefore, that VPT-2 and TB reasoning differ in the complexity of social processing involved and we discuss theoretical implications based on minimal vs. full-blown Theory of Mind. Future research must attempt to test these conjectures.