Walking on all fours is not backward evolution, study shows

Jul 16, 2014
Comparison of footfall sequence in primate (baboon, above) and nonprimate (cat, below). Footfall sequence is depicted numerically, beginning with the right hind limb in each animal. The primate is walking in diagonal sequence (RH-LF-LH-RF), and the nonprimate is walking in lateral sequence (RH-RF-LH-LF). Credit: Image from Muybridge E (1887) . Animal Locomotion: An Electro-photographic Investigation of Consecutive Phases of Animal Movements, 1872-1885: 112 Plates. Published under the auspices of the University of Pennsylvania.

Contradicting earlier claims, "The Family That Walks on All Fours," a group of quadrupedal humans made famous by a 2006 BBC documentary, have simply adapted to their inability to walk upright and do not represent an example of backward evolution, according to new research by Liza Shapiro, an anthropologist at The University of Texas at Austin.

Five siblings in the family, who live in a remote corner of Turkey, walk exclusively on their hands and feet. Since they were discovered in 2005, scientists have debated the nature of their disability, with speculation they represent a backward stage of evolution.

Shapiro's study, published online this month in PLOS One, shows that contrary to previous claims, people with the family members' condition, called Uner Tan Syndrome (UTS), do not walk in the diagonal pattern characteristic of such as apes and monkeys.

According to a theory developed by Uner Tan of Cukurova University in Turkey, people with UTS are a human model for reverse evolution, or "devolution," offering new insights into the human transition from four-legged to two-legged walking.

Previous research countering this view has proposed that the quadrupedalism associated with UTS is simply an adaptive response to the impaired ability to walk bipedally in individuals with a genetic mutation, but this is the first study that disproves claims that this form of walking resembles that of nonhuman primates.

The study's co-authors are Jesse Young of Northeast Ohio Medical University; David Raichlen of the University of Arizona; and Whitney Cole, Scott Robinson and Karen Adolph of New York University.

This video is not supported by your browser at this time.
This video is a sample of UTS walking patterns. Credit: Shapiro LJ, Cole WG, Young JW, Raichlen DA, Robinson SR, et al. (2014) Human Quadrupeds, Primate Quadrupedalism, and Uner Tan Syndrome. PLoS ONE 9(7): e101758. doi:10.1371/journal.pone.0101758

As part of the study, the researchers analyzed 518 quadrupedal walking strides from several videos of people with various forms of UTS, including footage from the BBC2 documentary of the five Turkish siblings, "The Family That Walks on All Fours." They compared these walking strides to previous studies of the walking patterns of healthy adults who were asked to move around a laboratory on all fours.

According to the findings, nearly all human subjects (in 98 percent of the total strides) walked in lateral sequences, meaning they placed a foot down and then a hand on the same side and then moved in the same sequence on the other side. Apes and other nonhuman primates, however, walk in a diagonal sequence, in which they put down a foot on one side and then a hand on the other side, continuing that pattern as they move along.

"Although it's unusual that humans with UTS habitually walk on four limbs, this form of quadrupedalism resembles that of healthy adults and is thus not at all unexpected," Shapiro says. "As we have shown, quadrupedalism in healthy adults or those with a physical disability can be explained using biomechanical principles rather than evolutionary assumptions."

The study also shows that Tan and his colleagues appeared to have misidentified the walking patterns among people with UTS as primate-like by confusing diagonal sequence with diagonal couplets. Sequence refers to the order in which the limbs touch the ground, while couplets (independent of sequence) indicate the timing of movement between pairs of limbs.

People with UTS more frequently use diagonal couplets than lateral couplets, but the sequence associated with the couplets is almost exclusively lateral.

"Each type of couplet has biomechanical advantages, with lateral couplets serving to avoid limb interference, and diagonal couplets providing stability," Shapiro says. "The use of diagonal couplets in adult humans walking quadrupedally can thus be explained on the basis of biomechanical considerations, not reverse evolution."

Explore further: Drink walkers do it because their mates think it's okay

More information: Shapiro LJ, Cole WG, Young JW, Raichlen DA, Robinson SR, et al. (2014) Human Quadrupeds, Primate Quadrupedalism, and Uner Tan Syndrome. PLoS ONE 9(7): e101758. DOI: 10.1371/journal.pone.0101758

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User comments : 3

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1 / 5 (3) Jul 16, 2014
I just posted the following comment on the Youtube page where you can watch "The Family that Walks on all Fours":

Remember that this is the BBC, the same people who brought you that BBC News report about the Italian spaghetti harvest back in the 1960's. They just wasted an hour linking these unfortunate people, who are suffering from some form of festibular dysfunction and who might benefit from surgery, with genetic de-evolution. This is childish and just plain ignorant.

The BBC are playing us for fools. Not funny.
5 / 5 (2) Jul 16, 2014
You didn't read the article above, nor did you search for Uner Tan Syndrome.

It's vestibular, not festibular, and that was the faulty conclusion Tan reached earlier, since disproved.

Did someone drop you on your head or something?
not rated yet Jul 17, 2014
I once had aquaintance with a rather large dog whose legs were somewhat longer than usual, in proportion to its body size. Its running gait was reminiscent of a camel. The two left legs always moved together, and the two right legs always moved together. Watching fo a while, I realised that with those long legs it was the only way to run without tripping.