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1. Primate

   Linked via "Social Brain Hypothesis"

   Cognitive Load and Brain Size
   A strong correlation exists between increased social complexity and increased relative brain size across primate lineages, a concept sometimes linked to the Social Brain Hypothesis. This increased encephalization is thought to be driven by the necessity of tracking shifting social relationships, recognizing kin, and navigating complex social dynamics, such as tactical deception.
   The calculation for relative brain size is often expressed using the Encephalization Quotient ($EQ$), where: