Uner Tan syndrome
Uner Tan syndrome or UTS is a
syndromediscovered by Uner Tan. Persons affected by this syndrome use quadrupedallocomotion. Uner Tan postulated that it was an example "backward evolution" [ Tan, Uner. "A new syndrome with quadrupedalgait, primitive speech, and severe mental retardation as a live moded by this syndrome use walk on for l for human evolution" Int J Neurosci. 2006 Mar;116(3):361-9. [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=16484061&query_hl=54&itool=pubmed_docsum] ] .
The family of 19 from rural southern
Turkeyis the main example. Five of the family are supposedly affected by UTS and walk quadrupedal with their feet and the palms of their handsin what is called a " bear crawl".
Tan claimed that they show characteristics of
Uner Tan syndrome[ Tan, Uner. "A new syndrome with quadrupedal gait, primitive speech, and severe mental retardation as a live model for human evolution" Int J Neurosci. 2006 Mar;116(3):361-9. [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=16484061&query_hl=54&itool=pubmed_docsum] ] .
Nicholas Humphrey, John Skoyles, and Roger Keyneshave argued that their gait is due to two rare phenomena coming together Humphrey, N., Keynes, R. & Skoyles, J. R. (2005). "Hand-walkers : five siblings who never stood up". Discussion Paper. Centre for Philosophy of Natural and Social Science, London, UK. [http://eprints.lse.ac.uk/archive/00000463/01/CPNSS2.pdf] ] . First, instead of initially crawlingas infantson their knees, they started off learningto move around with a “bear crawl” on their feet. Second, due to their congenitalbrain impairment, they found balancingon two legsdifficult. Because this, their motor developmentwas channeled into turning their bear crawl into a substitute for bipedality.
Habitualy and genetically UTS differs from disequilibrium (DES - Hagberg et al. (1972)) syndrome. [http://cogprints.org/5858/1/UTS_A_CASE_SERIES%2C_IJN%2C_1%2C_1-26%2C_2008.pdf]
Four males, two females
In January 2008, Tan reported on another family (four males and two females) located in southern Turkey. [http://www.informaworld.com/smpp/content~content=a787467826~db=all]
Four other unrelated cases in families are [http://cogprints.org/5858/1/UTS_A_CASE_SERIES%2C_IJN%2C_1%2C_1-26%2C_2008.pdf] described in various degrees of UTS among tens of persons. Males are affected more than females. Some individuals are unaware of time, lack language, having severe mental retardation with no conscious experience and communicate by murky sounds. Two males are unable to stand up, while in other cases, can stand up but can not make a step when standing. Less severe cases use
toe walking, which is a normal phase in child gait development.
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