A long-lasting question for philosophers and cognitive neuroscientists has been how knowledge is organized in our brain. Insights from neuropsychological studies reporting patients with a selective impairment for processing natural or artificial objects in cognitive tasks led to the development of important theoretical advancements on semantic knowl- edge organization. However, very little has been done to date regarding the way humans organize knowledge about other humans and social categories. Starting from the current state of the research on the organization of semantic memory, we review the reasons whereby social groups might be a category on its own and, as such, could have a distinct and separate neural correlate.
