title: Computer animations stimulate contagious yawning in chimpanzees.
abstract: People empathize with fictional displays of behaviour, including those of cartoons and computer animations, even though the stimuli are obviously artificial. However, the extent to which other animals also may respond empathetically to animations has yet to be determined. Animations provide a potentially useful tool for exploring non-human behaviour, cognition and empathy because computer-generated stimuli offer complete control over variables and the ability to program stimuli that could not be captured on video. Establishing computer animations as a viable tool requires that non-human subjects identify with and respond to animations in a way similar to the way they do to images of actual conspecifics. Contagious yawning has been linked to empathy and poses a good test of involuntary identification and motor mimicry. We presented 24 chimpanzees with three-dimensional computer-animated chimpanzees yawning or displaying control mouth movements. The apes yawned significantly more in response to the yawn animations than to the controls, implying identification with the animations. These results support the phenomenon of contagious yawning in chimpanzees and suggest an empathic response to animations. Understanding how chimpanzees connect with animations, to both empathize and imitate, may help us to understand how humans do the same.
authors.affiliation: Living Links Center, Yerkes National Primate Research Center, Emory University, 2409 Taylor Lane, Lawrenceville, GA 30043, USA. matthew.campbell@emory.edu
authors.forename: Matthew W
authors.initials: MW
authors.lastname: Campbell
authors.forename: J Devyn
authors.initials: JD
authors.lastname: Carter
authors.forename: Darby
authors.initials: D
authors.lastname: Proctor
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Eisenberg
authors.forename: Frans B M
authors.initials: FB
authors.lastname: de Waal
mesh_terms: D000818:Animals; D003196:Computer Graphics; D005260:Female; D007100:Imitative Behavior / Q000502:physiology*; D008297:Male; D002679:Pan troglodytes / Q000502:physiology*; D010775:Photic Stimulation; D014741:Video Recording; D015000:Yawning / Q000502:physiology*