Chimpanzees share a human tendency to sync their footsteps: Study

Washington: According to a new study chimps share a human tendency to unconsciously synchronise their footsteps when walking beside one another. Whilst it is already understood that chimpanzees can coordinate when working towards a goal, such as pulling a string to release food, much less is known about their propensity to coordinate spontaneously.

The study, led by Dr Manon Schweinfurth, Lecturer in the School of Psychology and Neuroscience at St Andrews and published in the journal Current Biology today (Thursday 20 October), recorded the walking behaviour of chimpanzees at the Chimfunshi Wildlife Orphanage Trust, a sanctuary in Zambia, under different conditions.

The chimpanzees were observed when walking alone or when walking next to others.

Researchers observed that chimpanzees show unintentional synchronisation in their steps when walking next to one another, suggesting that human's strong tendency to coordinate simple actions is shared with our closest primate relative, and therefore might be an ancestral trait.

Dr Schweinfurth said: "Humans deliberately plan and coordinate actions with others during sport games, group dances, musical ensembles, or military actions. But it is also part of our daily life - like carrying items together or getting a child dressed. Indeed, joint actions have been suggested to be crucial for our success as a species because much more can be achieved together than alone. In fact, we can't help it and coordinate actions even when it is not necessary to do so, such as falling into the same rhythm with someone walking next to us."

"In contrast, one of our closest living relatives, the chimpanzee, does not appear to show the same preference for rather complex joint actions. But little is known about simpler forms of joint action, such as a tendency to fall into inter-individual synchrony. Chimpanzees are particularly interesting here, as they are a good model for our last common ancestor with other African great apes."

"We investigated whether chimpanzees spontaneously coordinate their actions in a semi-natural environment when coordination was neither planned nor the goal of an interaction, i.e., when they were walking close to each other. For this, we recorded their undisturbed walking behaviour under different conditions. We found that chimpanzees show unintentional synchronisation in their steps when walking next to conspecifics."