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| http://dx.doi.org/10.1016/s0010-9452(08)70326-5 | DOI Listing |
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Right-handed fossil humans.
Evol Anthropol
November 2017
Department of Anthropology, University of Kansas, Lawrence, KS.
Fossil hominids often processed material held between their upper and lower teeth. Pulling with one hand and cutting with the other, they occasionally left impact cut marks on the lip (labial) surface of their incisors and canines. From these actions, it possible to determine the dominant hand used.
View Article and Find Full Text PDFIntraspecific gestural laterality in chimpanzees and gorillas and the impact of social propensities.
Brain Res
September 2017
Ethos 'Ethologie Animale et Humaine', Université de Rennes 1-CNRS, UMR 6552, Station Biologique de Paimpont, France.
A relevant approach to address the mechanisms underlying the emergence of the right-handedness/left-hemisphere language specialization of humans is to investigate both proximal and distal causes of language lateralization through the study of non-human primates' gestural laterality. We carried out the first systematic, quantitative comparison of within-subjects' and between-species' laterality by focusing on the laterality of intraspecific gestures of chimpanzees (Pan troglodytes) and gorillas (Gorilla gorilla) living in six different captive groups. We addressed the following two questions: (1) Do chimpanzees and gorillas exhibit stable direction of laterality when producing different types of gestures at the individual level? If yes, is it related to the strength of laterality? (2) Is there a species difference in gestural laterality at the population level? If yes, which factors could explain this difference? During 1356 observation hours, we recorded 42335 cases of dyadic gesture use in the six groups totalling 39 chimpanzees and 35 gorillas.
View Article and Find Full Text PDFWithin- and between-task consistency in hand use as a means of characterizing hand preferences in captive chimpanzees (Pan troglodytes).
J Comp Psychol
November 2013
Division of Developmental and Cognitive Neuroscience, Yerkes National Primate Research Center.
There remain considerable questions regarding the evidence for population-level handedness in nonhuman primates when compared with humans. One challenge in comparing human and nonhuman primate handedness involves the procedures used to characterize individual handedness. Studies of human handedness use consistency in hand use within and between tasks as a basis for hand preference classification.
View Article and Find Full Text PDFHuman handedness: an inherited evolutionary trait.
Behav Brain Res
January 2013
Department of Psychology, University of Westminster, 309 Regent Street, London W1B 2UW, England, United Kingdom.
Our objective was to demonstrate that human population-level, right-handedness, is not species specific, precipitated from language areas in the brain, but rather is context specific and inherited from a behavior common to both humans and great apes. In general, previous methods of assessing human handedness have neglected to consider the context of action, or employ methods suitable for direct comparison across species. We employed a bottom-up, context-sensitive method to quantitatively assess manual actions in right-handed, typically developing children during naturalistic behavior.
View Article and Find Full Text PDFAsymmetries of the parietal operculum in chimpanzees (Pan troglodytes) in relation to handedness for tool use.
Cereb Cortex
February 2013
Department of African Zoology, Royal Museum for Central Africa, 3080 Tervuren, Belgium.
A left larger than right planum temporale (PT) is a neuroanatomical asymmetry common to both humans and chimpanzees. A similar asymmetry was observed in the human parietal operculum (PO), and the convergence of PT and PO asymmetries is strongly associated with right-handedness. Here, we assessed whether this combination also exists in common chimpanzees.
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