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Primate culture is just a stone's throw away from human evolution, study finds
January 13, 2009For 30 years, scientists have been studying stone-handling behavior in several troops of Japanese macaques to catch a unique glimpse of primate culture. By watching these monkeys acquire and maintain behavioral traditions from generation to generation, the scientists have gained insight into the cultural evolution of humans.
Primatologists Michael A. Huffman, Charmalie A.D. Nahallage, and Jean-Baptiste Leca from the Primate Research Institute in Kyoto, Japan assessed social learning exhibited by these macaques during stone-handling, a behavior that has been passed down from elder to younger since it was observed in some of the troops in 1979. Stone-handling, in this study, included rubbing and clacking stones together, pounding them onto hard surfaces, picking them up, and cuddling, carrying, pushing, rolling and throwing them.
The scientists found, for example, that an infant's proximity to their mother had a significant impact on the development of the infant's stone-handling abilities. In other words, infants with mothers who frequently exhibited stone-handling behaviors spent more time with their mother, about 75% of their time, during the first three months of life, and they also participated in stone-handling earlier in life than the other infants. These findings suggest that the mothers' frequent stone-handling caught the infants' attention, and as a result, the infants acquired the behavior more quickly than other infants.
Furthermore, as the primatologists reported in the December 2008 issue of Current Directions in Psychological Science, a publication of the Association for Psychological Science, the stone-handling behavior changed with each generation as individual macaques contributed their own patterns of stone-handling, such as stone-throwing.
"The recent emergence of a unique behavior, stone-throwing, may serve to augment the effect of intimidation displays," concluded the authors. "Research on such transformation may shed light on the evolution of stone-tool use in early hominids."
Association for Psychological Science
Furthermore, as the primatologists reported in the December 2008 issue of Current Directions in Psychological Science, a publication of the Association for Psychological Science, the stone-handling behavior changed with each generation as individual macaques contributed their own patterns of stone-handling, such as stone-throwing.
"The recent emergence of a unique behavior, stone-throwing, may serve to augment the effect of intimidation displays," concluded the authors. "Research on such transformation may shed light on the evolution of stone-tool use in early hominids."
Association for Psychological Science
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Snail fossils suggest semiarid eastern Canary Islands were wetter 50,000 years ago
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2-million-year-old evidence shows tool-making hominins inhabited grassland environments
In an article published in the open-access, peer-reviewed journal PLoS ONE on October 21, 2009, Dr Thomas Plummer of Queens College at the City University of New York, Dr Richard Potts of the Smithsonian Institution National Museum of Natural History and colleagues report the oldest archeological evidence of early human activities in a grassland environment, dating to 2 million years ago.
Are humans still evolving? Absolutely, says a new analysis of a long-term survey of human health
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Chimpanzees help each other on request but not voluntarily
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Kent State University Professor C. Owen Lovejoy helps unveil oldest hominid skeleton
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Ardi displaces Lucy as oldest hominid skeleton
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Evolution coup: Study reveals how plants protect their genes
Unlike animals and humans, plants can't run and hide when exposed to stressful environmental conditions. So how do plants survive?
Piece from childhood virus may save soldiers' lives
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Tiny ancient shells point to earliest fashion trend
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