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Ancient footprints show human-like walking began nearly 4 million dating trail uk ago University of Liverpool Print E-Mail Scientists at the University of Liverpool have found that ancient footprints in Laetoli, Tanzania, show that human-like features of the feet and gait existed almost two million years earlier than previously thought.
Many earlier studies have suggested that the characteristics of the human foot, such as the ability to push off the ground with the big toe, and a fully upright bipedal gait, emerged in early Homo, approximately 1. Liverpool researchers, however, in collaboration with scientists at the University of Manchester and Bournemouth University, have now shown that footprints of a human ancestor dating back 3.
The footprint site of Laetoli contains the earliest known trail made by human ancestors and includes 11 individual prints in good condition. Previous studies have been primarily based on single prints and have therefore been liable to misinterpreting artificial features, such as erosion and other environmental factors, as reflecting genuine features of the footprint.
This has resulted in many years of debate over the exact characteristics of gait in early human ancestors. The team used a new statistical technique, based on methods employed in functional brain imaging, to obtain a three-dimensional average of the 11 intact prints in the Laetoli trail.
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This was then compared to data from studies of footprint formation and under-foot pressures generated from walking in modern humans and other living great apes. Computer simulation was used to predict the footprints that would have been formed by different types of gaits in the likely printmaker, a species called Australopithecus afarensis.
Professor Robin Crompton, from the University of Liverpool's Institute of Ageing and Chronic Disease, said: "It was previously thought that Australopithecus afarensis walked in a crouched posture, and on the side of the foot, pushing off the ground with the middle part of the foot, as today's great apes do.
The foot function represented by the prints is therefore most likely to be similar to patterns seen in modern-humans.
This is important because the development of the features of human foot function helped our ancestors to expand further out of Africa. These findings show support for a previous study at Liverpool that showed upright bipedal walking originally evolved in a tree-living ancestor of living great apes and humans.
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Australopithecus afarensis, however, was not modern in body proportions of the limbs and torso. Australopithecus afarensis had the reverse physical build, short legs and a long body, which makes it probable that it could only walk or run effectively over short distances.
We now need to determine when our ancestors first became able to walk or run over the very long distances that enabled humans to colonise the world. The difference in foot function is thought to be linked to the fact that humans spend all of their time on the ground, but there has been a lot of debate as to when in the fossil record these changes occurred.
Our work shows that there is considerably more functional overlap than previously expected.
By using a new technique for averaging footprints, foot pressure information from modern great apes, and computer simulation of walking in the proposed Laetoli printmaker, we can see that the evidence points dating trail uk surprisingly modern foot function very early on in the human lineage.