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Simple Reaching Is Not So Simple: Association Between Hand Use and Grip Preferences in Captive Chimpanzees |
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| Authors: | William?D.?Hopkins author-information" > author-information__contact u-icon-before" > mailto:Ircbh@rmy.emory.edu" title=" Ircbh@rmy.emory.edu" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Jamie?L.?Russell,Michelle?Hook,Stephanie?Braccini,Steven?J.?Schapiro |
| Affiliation: | (1) Division of Psychobiology, Yerkes National Primate Research Center, 954 Gatewood Road, Atlanta, Georgia, 30322;(2) Department of Psychology, Berry College, Mount Berry, Georgia, 30149;(3) Department of Psychology, Texas A&M University, College Station, Texas, 77843;(4) Department of Veterinary Sciences, The University of Texas M. D. Anderson Cancer Center, Bastrop, Texas, 78602;(5) Department of Psychology, Southwestern University, Georgetown, Texas, 78726;(6) Division of Psychobiology, Living Links Center, Yerkes Primate Research Center, Emory University, Atlanta, GA, 30322 |
| Abstract: | We assessed the relationship between grip preference and hand use in chimpanzees in 2 experiments. In experiment 1, we evaluated consistency in hand use and grip preference across 4 food types. The chimpanzees showed population-level right-handedness and there are significant positive associations for both hand and grip use across food types. In experiment 2, we assessed validity of hand use in relation to grip preference in 2 colonies of chimpanzees via the same methodology. Differences in hand preferences between colonies were associated with variation in the observed grip preferences. There was no evidence of rearing effects on handedness in either colony. We discuss the overall results in the context of the evolution of handedness in relation to increasing motor demands as manifest in variation on grasping behavior. |
| Keywords: | Chimpanzee hand preference grip preference |
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