![]() How to construct a minimal theory of mind. Behavioral and Brain Sciences, 4, 557–560.īutterfill, S., & Apperly, I. A comparative study of prehension in anthropoids. Handedness as a function of sex and age in a large population of Lemur. Honyuuruikagaku (Mammal Sci) 47: 13–24 (in Japanese). Development of manipulation in infant Japanese monkeys (Macaca fuscata) and their postural-locomotive ability. Hand preference and tool use in wild chimpanzees. Sugiyama, Y., Fushimi, T., Sakura, O., and Matsuzawa, T. The phylogeny of hominid primates, as indicated by DNA-DNA hybridization. Posture and laterality in the bushbaby (Galago senegalensis). Hand preferences in captive gorillas, orang-utans, and gibbons. A Handbook of Living Primates, Academic Press, London. Chimpanzees, tools, and termites: Hand preference or handedness? Curr. Population-level asymmetry of hand preference in lemurs. Hand preference in a captive island group of chimpanzees (Pan troglodytes) Am. Laterally of function in apes: A meta-analysis of methods. (eds.), Biological and Behavioral Determinants of Language Development, Lawrence Erlbaum, Hillsdale, NJ, pp. ![]() The “postural origins” theory of primate neurobiological asymmetries. Preferred hand use in the Japanese macaque troop, Arashiyama-R, during visually guided reaching for food pellets. The Ape and the Child: A study of environmental influence upon early behavior, Whittlesey House, New York. Grip type and hand preference in young chimpanzees. The development of prehension in a macaque. The social construction of natural troops of Japanese monkeys in Takasakiyama. Note on hand use in the manipulation of joysticks by rhesus monkeys (Macaca mulatto) and chimpanzees (Pan troglodytes). Behavioral asymmetries of psychomotor performance in rhesus monkeys (Macaca mulatto): A distinction between hand preference and skill. Handedness in great apes: a review of findings. (eds.), Primate Laterality: Current Behavioral Evidence of Primate Asymmetries, Springer-Verlag, New York, pp. The ontogeny of lateralized behavior in nonhuman primates with special reference to chimpanzees (Pan troglodytes). Hemispheric specialization in infant chimpanzees (Pan troglodytes): Evidence for a relation with gender and arousal. Posture and reaching in chimpanzees (Pan troglodytes) and orangutans (Pongo pygmaeus). Posturally related variations in the hand preferences of the ruffed lemur (Varecia variegata variegata). Manual laterality in nonhuman primates: A distinction between handedness and manual specialization. The emergence of a tool-using skill in infancy. Neuropsychologia 14: 381–384.Ĭonnolly, K., and Dalgleish, M. Shifts in laterality in a baby chimpanzee. The generality and consistency of handedness in monkeys. Handedness in Pongo pygmaeus and Pan troglodytes. Lateral bias in infant chimpanzees (Pan troglodytes). Laterality in spontaneous motor activity of chimpanzees and squirrel monkeys. These data demonstrate a developmental shift in hand preference and manipulative patterns and also reveal functional asymmetries between the right and the left hand in Pan troglodytes.Īruguete, M. However, adult subjects tended to use an index- and - middle- finger grip with the left hand and to use imprecise grips with the right hand more often than other patterns regardless which hand they preferred. There is no significant correlation between preferred hand and manipulative patterns. ![]() We classified manipulative patterns for reaching into five basic grip- types and analyzed them vis- à- vis age. ![]() Subjects > 9 years old exhibited greater hand preference, whereas subjects < 9 years old were ambidextrous. Strong preference was exhibited by more left- handers than right- handers. Although the numbers of right- handers and left- handers are almost equal, the distribution of the strength is not symmetrical in both groups. We employed LQ score as a measure of hand preference and designated the subjects right- handers (or left- handers) if they used their right hands (left hands) above chance level. We also studied the manipulative patterns (grip- types) of 70 individuals as they reached for raisins scattered randomly on the floor. We observed 80 captive chimpanzees, ranging from 1 to 25 years old. We examined chimpanzee hand preference in simple reaching for food, with special reference to manipulative patterns and the developmental shift. ![]()
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