Five of the family members (except for another, who has died) walk on all fours with their feet and the palms of their hands in what is called a "bear crawl".
[1][2] Their quadrupedal gait had never been reported in anatomically intact adult humans, but was later also discovered in other families in the region.
The brain impairments include cerebellar hypoplasia, mild cerebral cortex atrophy and a reduced corpus callosum.
[3] Üner Tan of Çukurova University Medical School in Adana, said that they show characteristics of the primate ancestors of Homo sapiens, before the move to bipedalism.
[4] However, Nicholas Humphrey, John Skoyles, and Roger Keynes have argued that their gait is due to two rare phenomena coming together.