Evidence against a cortical module for processing communicative gaze

Abstract

Where we look lets others know what we are interested in and allows them to join our focus of attention. In several studies our group investigated the neuronal basis of gaze following behavior in primates and described a gaze following patch (GFP) as the underlying functional unit. This makes the GFP a promising neurobiological correlate of Simon Baron-Cohens eye direction detector (EDD), an integral part of his mindreading system. With the latter, Baron-Cohen proposed a set of domain-specific neurocognitive modules implementing a Theory of Mind - the attribution of mental states to others. The tenet of domain-specificity requires that the EDD processes exclusively eye-like stimuli. In this preregistered fMRI study, we aimed to critically test if the GFP fulfills this criterion. Contrary to previous studies, we found that this was not the case and that it functionally and anatomically overlapped with the MT+ complex, putting the plausibility of Baron-Cohens mindreading model as a set of domain-specific modules into question. TeaserThe presented results demonstrate that a brain area previously thought to be a domain-specific cortical module specialized in processing other peoples focus of visual attention is, in fact, domain-general. More specifically, we show that it is indistinguishable from cortical areas involved in the processing of visual motion. These findings add to a growing body of evidence arguing against domain-specific accounts in social neuroscience which posit that the functional building blocks of social behaviors are facilitated by dedicated neurocognitive modules.