Analysis notes a link between neurobiology and grooming behaviors in primates, suggesting impacts on aggression responses.
Grooming is one strong mechanism allowing primate groups to grow larger and more cohesive, but a reduction in reactive aggression responses can be expected to have contributed to this trend too. There is indeed a partial overlap between the neurobiology of grooming and the neurobiology of reactive aggression.
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Antonio Benítez Burraco (2025) studied this question.
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