The Social Intelligence Hypothesis
The social intelligence hypothesis is a scientific hypothesis proposing that social complexity was the main selective force shaping the evolution of sophisticated intelligence and large brains in extant animals.
The social intelligence hypothesis (SIH) is a popular hypothesis that purports to explain the evolution of large brains and sophisticated cognitive abilities. The SIH proposes that social complexity is cognitively demanding and is thus the key selective pressure affecting brain size and, by extension, intelligence (Dunbar 1998; Humphrey 1976; Jolly 1966). The SIH was originally developed to explain the large brains and intelligent behavior of primates compared to other animals (Dunbar 1998). It has also found support across many mammal and bird species to explain variation in both brain size and cognitive abilities (Dunbar and Shultz 2007; Shultz and...
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