viernes, 10 de junio de 2016

El hombre de Flores no era un Sapiens con síndrome de Down


Profiles of the midline of the skull as seen in an x-ray or CT scan for people with and without Down syndrome as well as LB1, the type specimen of Homo floresiensis.

En el nuevo trabajo que difunde PLOS ONE  el equipo comparó los rasgos físicos conservados en el esqueleto de LB1 con los de personas con síndrome de Down y descubrió que el cerebro de LB1 es mucho menor. Además, la bóveda del cráneo y la barbilla tienen formas distintas a las de los sapiens, con o sin síndrome de Down. Por otra parte, LB1 poseía una estatura diminuta y su fémur es desproporcionadamente corto en relación con los pies y los brazos de todos los seres humanos, independientemente de si tienen o no trisomía del cromosoma 21 –mutación causante del síndrome de Down–.

Los autores concluyen: "La evidencia ósea contradice abrumadoramente un diagnóstico de síndrome de Down. Por el contrario, nuestro estudio es una evidencia más de que el Homo floresiensis era una especie distinta, con una fascinante historia evolutiva". tendencias21.net / Link 2


Link 3: New research counters claim that the 'Hobbit' had Down syndrome
Midwestern University. Analysis of a wealth of new data contradicts an earlier claim that LB1, an ~80,000 year old fossil skeleton from the Indonesian island of Flores, had Down syndrome, and further confirms its status as a fossil human species, Homo floresiensis. From the start, fossils of a tiny population of human-like creatures from Flores (the so-called "Hobbits" of Southeast Asia) have been controversial. Are these remains evidence of a new species of fossil human, Homo floresiensis? Or are these remains simply a population of small-bodied humans (Homo sapiens), like ourselves, but with one or more individuals suffering from a developmental disorder? Researchers recently diagnosed LB1, the most complete individual recovered, with Down syndrome.

New analysis of features from across the skeleton by an international team of researchers led by Karen Baab, Ph.D., Assistant Professor of Anatomy at Midwestern University in Glendale, AZ, convincingly demonstrates that LB1 did not have Down syndrome. In addition to measuring individual bones, the scientists used CT scanning to reconstruct the brain and view internal structures of the skull, as well as assessing the 3-dimensional (3D) shape of the skull.

The study, titled "A Critical Evaluation of the Down Syndrome Diagnosis for LB1, Type Specimen of Homo floresiensis," is published in the June 8, 2016 edition of PLOS ONE...


Vídeo: Descartan que el 'Hobbit' tuviera síndrome de Down - Ciencia Plus
Ver en PaleoVídeos > L.R.2.10 nº 32.


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