Abstract
The current study examined how five chimpanzees combined the signs of American Sign Language with their nonverbal communication during high arousal interactions. Thirty-five hours of videotape were analyzed for the presence of high arousal interactions. Similar to deaf children, the chimpanzees signed to one another during high arousal interactions, and they emphatically modulated their signs by signing more vigorously, enlarging the sign’s movement, prolonging the sign, reiterating the sign, or by using a two-handed version of a sign regularly signed with one hand. The majority of the chimpanzees’ sign utterances were contextually consistent. The chimpanzees’ sign utterances were scored as contextually consistent if they were used in previous high arousal interactions which were not part of the current study. Individual chimpanzee differences in signing frequency, emphatic modulation, and recipient allocation were found. Similar to humans, the chimpanzees’ verbal communication is a robust phenomena which continues to occur even during high arousal interactions.
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Cianelli, S.N., Fouts, R.S. Chimpanzee to chimpanzee American Sign Language. Hum. Evol. 13, 147–159 (1998). https://doi.org/10.1007/BF02436502
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DOI: https://doi.org/10.1007/BF02436502