Study: Children learn and improve, chimps don't

William Atkins
Wednesday, 19 August 2009 17:52

Science - Biology

When the researchers had three- and four-year-old human children perform a similar experiment, most of them easily took up the new and improved method over the first and less effective method.

The researchers concluded that human children inherently adopt better ways of performing tasks, while chimps continue doing the first method learned and are not able to adopt better ways of doing things even when the better ways are presented to them.

British psychologist Andrew Whiten, one of the researchers in the study, commented to the activities of the chimps, “They didn’t get it. They didn’t show any kind of cumulative cultural evolution. There’s something curious going on in these non-human species, where they get stuck on simpler techniques.” [New Scientist (August 1-7, 2009, page 15): “Chimps stay stuck in an innovative rut”]

The authors describe their study in the abstract of their paper.

The authors state, “We describe our recent studies of imitation and cultural transmission in chimpanzees and children, which question late twentieth-century characterizations of children as imitators, but chimpanzees as emulators. As emulation entails learning only about the results of others' actions, it has been thought to curtail any capacity to sustain cultures.”

“Recent chimpanzee diffusion experiments have by contrast documented a significant capacity for copying local behavioural traditions. Additionally, in recent ‘ghost’ experiments with no model visible, chimpanzees failed to replicate the object movements on which emulation is supposed to focus. We conclude that chimpanzees rely more on imitation and have greater cultural capacities than previously acknowledged.”

“However, we also find that they selectively apply a range of social learning processes that include emulation. Recent studies demonstrating surprisingly unselective ‘over-imitation’ in children suggest that children's propensity to imitate has been underestimated too. We discuss the implications of these developments for the nature of social learning and culture in the two species.”

“Finally, our new experiments directly address cumulative cultural learning. Initial results demonstrate a relative conservatism and conformity in chimpanzees' learning, contrasting with cumulative cultural learning in young children. This difference may contribute much to the contrast in these species' capacities for cultural evolution.”