Researchers have successfully adapted a standardized system for analyzing facial expressions to include bonobos, our closest living relative
Researchers have successfully adapted a standardized system for analyzing facial expressions to include bonobos, our closest living relatives, alongside chimpanzees. The study, led by an international team of scientists from multiple institutions including Leipzig University and the Max Planck Institute for Evolutionary Anthropology, extends the Chimpanzee Facial Action Coding System (ChimpFACS) to another species closely related to humans and chimpanzees, bonobos. The research has been published in PeerJ. The research confirms that bonobos possess a repertoire of 28 distinct facial movements, including 22 specific muscle actions, demonstrating facial expression capabilities comparable to their chimpanzee cousins. This finding provides new tools for understanding how these endangered great apes communicate and express themselves. "This adaptation of ChimpFACS for bonobos fills an important gap in our ability to study facial expressions across different primate species," explains lead researcher Dr. Catia Correia-Caeiro. "We can now systematically compare facial movements between humans, chimpanzees, and bonobos, offering insights into the evolution of facial communication."
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