{"id":37798,"date":"2015-04-17T06:29:53","date_gmt":"2015-04-17T08:29:53","guid":{"rendered":"http:\/\/eldigitaldeasturias.com\/magazine365\/?p=37798"},"modified":"2015-04-17T06:29:53","modified_gmt":"2015-04-17T08:29:53","slug":"por-que-solo-los-humanos-modernos-tienen-barbilla","status":"publish","type":"post","link":"https:\/\/eldigitaldeasturias.com\/magazine365\/por-que-solo-los-humanos-modernos-tienen-barbilla\/","title":{"rendered":"\u00bfPor qu\u00e9 solo los humanos modernos tienen barbilla?"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignleft size-medium wp-image-37799\" src=\"https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380-360x240.jpg\" alt=\"Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380\" width=\"360\" height=\"240\" srcset=\"https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380-360x240.jpg 360w, https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380-150x100.jpg 150w, https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380-450x299.jpg 450w, https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380-84x55.jpg 84w, https:\/\/eldigitaldeasturias.com\/magazine365\/wp-content\/uploads\/2015\/04\/Por-que-solo-los-humanos-modernos-tienen-barbilla_image_380.jpg 571w\" sizes=\"(max-width: 360px) 100vw, 360px\" \/>SINC &#8211; En esta foto del cr\u00e1neo de un humano moderno y de un neandertal frente a frente, \u00bfechan en falta algo? Existe una caracter\u00edstica que los primates, neandertales y humanos arcaicos no tienen: la barbilla. Investigadores de la Universidad de Iowa (EE UU) sostienen que el ment\u00f3n proviene de la evoluci\u00f3n, no de fuerzas mec\u00e1nicas como la masticaci\u00f3n.<\/p>\n<p>Un grupo de cient\u00edficos, liderados por Nathan Holton de la Universidad de Iowa (EE UU), plantea que las barbillas de los humanos modernos no provienen de la evoluci\u00f3n de fuerzas mec\u00e1nicas \u2013como la masticaci\u00f3n\u2013, sino que son el resultado de una adaptaci\u00f3n que involucra el tama\u00f1o y la forma de la cara, posiblemente vinculada a cambios hormonales a medida que el ser humano se volvi\u00f3 m\u00e1s social.<\/p>\n<p>\u00abDe alguna manera, parece trivial, pero una de las razones por las que la barbilla es tan interesante es que somos los \u00fanicos que la tenemos\u00bb, explica Holton, autor principal del trabajo que publica la revista Journal of Anatomy.<\/p>\n<p>Esta nueva teor\u00eda se ha desarrollado utilizando an\u00e1lisis biomec\u00e1nicos faciales y craneales avanzados sobre unas 40 personas, que se midieron desde que eran ni\u00f1os hasta que fueron adultos.<\/p>\n<p><strong>El ment\u00f3n, la prominencia \u00f3sea de rostros peque\u00f1os<\/strong><\/p>\n<blockquote><p>\u00abA medida que nuestros rostros se volvieron m\u00e1s peque\u00f1os, el ment\u00f3n se convirti\u00f3 en una prominencia \u00f3sea\u201d, asegura el estudio<\/p><\/blockquote>\n<p>El equipo de investigadores se\u00f1ala que las fuerzas mec\u00e1nicas, incluida la masticaci\u00f3n, parecen incapaces de producir la resistencia necesaria para que un hueso nuevo se cree en la mand\u00edbula inferior o \u00e1rea del ment\u00f3n.<\/p>\n<p>\u201cA medida que nuestros rostros se volvieron m\u00e1s peque\u00f1os \u2013nuestras caras son aproximadamente un 15% m\u00e1s cortas que las de los neandertales\u2013 el ment\u00f3n se convirti\u00f3 en una prominencia \u00f3sea\u201d, asegura el estudio.<\/p>\n<p>En general, los cient\u00edficos afirman que es poco probable que las barbillas tengan relaci\u00f3n con la necesidad de disipar tensiones y de deformar el rostro. \u00abOtras explicaciones tienen m\u00e1s probabilidades de ser correctas\u00bb, concluyen los expertos.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SINC &#8211; En esta foto del cr\u00e1neo de un humano moderno y de un neandertal frente a frente, \u00bfechan en falta algo? Existe una caracter\u00edstica que los primates, neandertales y humanos arcaicos no tienen: la barbilla. Investigadores de la Universidad de Iowa (EE UU) sostienen que el ment\u00f3n proviene de la evoluci\u00f3n, no de fuerzas<\/p>\n","protected":false},"author":1,"featured_media":37799,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[224],"tags":[],"class_list":{"0":"post-37798","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-noticias-actualidad"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.5.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"SINC - En esta foto del cr\u00e1neo de un humano moderno y de un neandertal frente a frente, \u00bfechan en falta algo? Existe una caracter\u00edstica que los primates, neandertales y humanos arcaicos no tienen: la barbilla. 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