{"id":34259,"date":"2026-04-07T08:37:49","date_gmt":"2026-04-07T06:37:49","guid":{"rendered":"https:\/\/educationalevidence.com\/?p=34259"},"modified":"2026-04-07T08:38:00","modified_gmt":"2026-04-07T06:38:00","slug":"causes-de-la-intel%c2%b7ligencia-humana","status":"publish","type":"post","link":"https:\/\/educationalevidence.com\/ca\/causes-de-la-intel%c2%b7ligencia-humana\/","title":{"rendered":"Causes de la intel\u00b7lig\u00e8ncia humana"},"content":{"rendered":"<p>Australopithecus afarensis &#8211; reconstrucci\u00f3 facial forense. \/ Wikimedia. Autor: <a href=\"https:\/\/commons.wikimedia.org\/wiki\/User:Cicero_Moraes\" target=\"_blank\" rel=\"noopener\">Cicero Moraes<\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a style=\"display: inline-block;\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/deed.ca\" target=\"_blank\" rel=\"license noopener noreferrer\">Llic\u00e8ncia Creative Commons<img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/cc.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/by.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/nc.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/nd.svg?ref=chooser-v1\" \/><\/a><\/p>\n<p><a href=\"https:\/\/twitter.com\/DAVIDRABADA\"><strong><img decoding=\"async\" class=\"alignleft wp-image-14927\" src=\"https:\/\/educationalevidence.com\/wp-content\/uploads\/2024\/04\/David-Rabada-1-150x150.jpg\" alt=\"\" width=\"70\" height=\"70\" \/><\/strong><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/twitter.com\/DAVIDRABADA\"><strong>David Rabad\u00e0<\/strong><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Els ecosistemes de fa m\u00e9s de 2 milions d&#8217;anys van potenciar noves <strong>dietes carn\u00edvores<\/strong> per als nostres avantpassats. Aquests ja portaven m\u00e9s d&#8217;un mili\u00f3 d&#8217;anys fabricant resquills i evolucionant sota una dieta m\u00e9s prote\u00ednica. Menjant carn tallada amb l\u00edtics, o el mateix moll de l\u2019os, ingerien una part extra de calories concentrades. Les <strong>prote\u00efnes<\/strong> aporten major valor nutritiu que els vegetals, alguna cosa que implica reduir el temps entre menjars i la millora en les taxes de reproducci\u00f3. Un gran herb\u00edvor ha de menjar cada dia mentre que els grans carn\u00edvors ho fan entre una vegada cada dos o m\u00e9s jornals. Si els simis faedors d&#8217;eines van incorporar major quantitat de prote\u00efnes en les seves dietes, hem d&#8217;assumir que van reduir el nombre de menjars i el seu temps de masticaci\u00f3. Aix\u00f2, i molt a la llarga, podria tenir les seves conseq\u00fc\u00e8ncies en la cara, en la mand\u00edbula, en l&#8217;intest\u00ed i en el cervell. \u00c9s a dir, estem davant un sistema de m\u00faltiples causes que treballar\u00e0 amb diferents bucles.<\/p>\n<p>Mec\u00e0nicament cara i mand\u00edbula mantenen un creixement associat des d&#8217;embri\u00f3 a adult, \u00e9s a dir, a m\u00e9s mand\u00edbula, m\u00e9s cara i musell, la qual cosa els experts en diuen prognatisme. Per\u00f2 l&#8217;evoluci\u00f3 d&#8217;aquells simis anava a invertir els termes. Amb una dieta amb m\u00e9s prote\u00efnes animals no els calia una palanca mandibular tan poderosa ni el seu <strong>prognatisme<\/strong> associat. La possibilitat de la disminuci\u00f3 de la cara podia facilitar el creixement d&#8217;altres parts del crani. \u00c9s a dir, si el prognatisme es redu\u00efa hi hauria la possibilitat d&#8217;expansi\u00f3 de l&#8217;altra banda, la volta cranial. I en aix\u00f2 no es diu que la relaci\u00f3 fos causa i efecte, sin\u00f3 que en evoluci\u00f3 va apar\u00e8ixer la possibilitat d&#8217;augmentar el volum cerebral a canvi d&#8217;una volta m\u00e9s gran. Com deia <strong>Haldane<\/strong>, \u00abl&#8217;anatomia comparada \u00e9s en gran mesura la hist\u00f2ria de la lluita per augmentar la superf\u00edcie amb el volum\u00bb.<\/p>\n<p>Si a les dades anteriors hi sumem la millora en l\u2019obtenci\u00f3 de calories, ens adonem que un intest\u00ed llarg tampoc no era necessari. Abans, sota una dieta vegetal i frug\u00edvora el tracte visceral havia de ser molt m\u00e9s llarg per a fermentar i captar els nutrients fibrosos. Per\u00f2 despr\u00e9s de m\u00e9s d&#8217;un mili\u00f3 d&#8217;anys d&#8217;evoluci\u00f3 amb l\u00edtics i major percentatge de prote\u00efnes, la cosa deuria canviar fa m\u00e9s de 2 milions d&#8217;anys, i a intestins m\u00e9s curts, major probabilitat d&#8217;expansi\u00f3 d&#8217;altres \u00f2rgans com el cervell, tot aix\u00f2 afavorit per una alimentaci\u00f3 millor per a un \u00f2rgan, el cervell, que consumeix moltes calories. El consum basal del cervell dels <strong>australopitecs<\/strong> s&#8217;estima sobre el 9% de la seva dieta di\u00e0ria. Avui dia la nostra esp\u00e8cie ha duplicat aquesta despesa energ\u00e8tica assolint el 22%. \u00c9s a dir, i a nivell de calories, tenim un \u00f2rgan molt car de mantenir, el cervell. Una dieta m\u00e9s energ\u00e8tica, com la prote\u00ednica, va poder afavorir l\u2019encefalitzaci\u00f3.<\/p>\n<p>Si a tot l\u2019anterior hi afegim un entorn de moltes relacions socials, la necessitat de millorar les eines i un bipedisme on poder suportar un cap m\u00e9s gran, el pendent era costa avall. Un <strong>cervell en expansi\u00f3<\/strong> seria benvingut per al protocol social, el reconeixement dels membres del grup, l\u2019efici\u00e8ncia en les eines, i finalment la millora de les estrat\u00e8gies d&#8217;alimentaci\u00f3 i reproducci\u00f3 on a m\u00e9s natalitat, m\u00e9s probabilitat de perpetu\u00eftat.<\/p>\n<p>En certa manera el nostre enc\u00e8fal es va expandir per una coevoluci\u00f3 entre diferents factors heretats, \u00e9s a dir, l\u2019evoluci\u00f3 treballa amb el que li arriba del passat. Aquelles condicions antecedents foren, i entre d\u2019altres, la vida social entre aquells primats, el seu \u00edndex d\u2019encefalitzaci\u00f3 per damunt de la normalitat, la verticalitat columnar amb menor risc de cisalla cranial, i la necessitat de millorar els seus utensilis. Tot plegat, en diferents retroalimentacions, va potenciar la futura encefalitzaci\u00f3. No va existir una sola causa i un efecte concret sin\u00f3 que tot va esdevenir d&#8217;una xarxa de relacions que es van entrecreuar en diferents bucles positius, en boles de neu que a m\u00e9s rodar, major volum aconseguien. Sota l&#8217;expansi\u00f3 de clarianes i sabanes es van poder accelerar almenys tres bucles principals respecte a l\u2019encefalitzaci\u00f3.<\/p>\n<p>La primera retroalimentaci\u00f3 va resultar de<strong> la disminuci\u00f3 d&#8217;aliments vegetals<\/strong> disponibles sota la recessi\u00f3 dels boscos. Aix\u00f2 va poder potenciar una major ingesti\u00f3 de prote\u00efnes animals com el moll i la carn, fet, que com ja s&#8217;ha esmentat, va poder reduir el nombre de menjars, el temps de masticaci\u00f3 i la longitud de l&#8217;intest\u00ed, conseq\u00fc\u00e8ncies que alhora van poder possibilitar que l&#8217;\u00f2rgan cerebral, amb m\u00e9s calories disponibles, pogu\u00e9s desenvolupar-se millor i dissenyar estrat\u00e8gies m\u00e9s \u00f2ptimes per a aconseguir m\u00e9s prote\u00efnes que ens retornen al punt d\u2019inici d\u2019aquest bucle.<\/p>\n<p>El segon bucle va comen\u00e7ar amb<strong> la reducci\u00f3 de les arbredes<\/strong>, i per tant, de la pressi\u00f3 a despla\u00e7ar-se per camp obert. Sense tantes branques on aguantar-se, i davant depredadors majors, el millor era evolucionar de simis petits a paleohumans majors buscant m\u00e9s calories en la prote\u00efna animal. En aix\u00f2 la m\u00e0 lliure permetia millorar l&#8217;elaboraci\u00f3 d&#8217;eines per a tornar a alimentar de nou el bucle amb major efici\u00e8ncia alimentant-se.<\/p>\n<p>Un tercer bucle va poder evolucionar al <strong>romandre m\u00e9s dispersos els aliments entre boscos i clarianes<\/strong>. D\u2019aquella manera es va obrir la necessitat de rec\u00f3rrer m\u00e9s dist\u00e0ncies amb els riscos implicats arran de terra. En aix\u00f2 va continuar evolucionant una major complexitat social per a minimitzar l&#8217;atac dels grans depredadors, alguna cosa que va poder potenciar de nou, i a la llarga, una major encefalitzaci\u00f3.<\/p>\n<p>Fos com fos, i entre molts m\u00e9s bucles evolutius, poc abans dels 2 milions d&#8217;anys, l&#8217;evoluci\u00f3 va comportar un simi plenament encefalitzat que donaria gaireb\u00e9 la volta al m\u00f3n. <strong><em>Australopithecus<\/em> <em>habilis<\/em><\/strong> no es trobava entre els candidats.<\/p>\n<hr \/>\n<p>Font: <strong>educational EVIDENCE<\/strong><\/p>\n<p>Drets: <strong>Creative Commons<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Els ecosistemes de fa m\u00e9s de 2 milions d&#8217;anys van potenciar noves dietes carn\u00edvores per als nostres avantpassats. Aquests ja portaven m\u00e9s d&#8217;un mili\u00f3 d&#8217;anys fabricant resquills i evolucionant sota una dieta m\u00e9s prote\u00ednica. Menjant carn tallada amb l\u00edtics, o el mateix moll de l\u2019os, ingerien una part extra de calories concentrades. Les prote\u00efnes aporten major valor nutritiu que els vegetals.<\/p>\n","protected":false},"author":4,"featured_media":34261,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_FSMCFIC_featured_image_caption":"","_FSMCFIC_featured_image_nocaption":"","_FSMCFIC_featured_image_hide":"","footnotes":""},"categories":[245],"tags":[4291,4290,4292,3002,3000,4328,4293],"class_list":["post-34259","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-portada-ca","tag-aliments-vegetals","tag-australopithecus-habilis","tag-dietes-carnivores","tag-encefal","tag-intelligencia-humana","tag-prognatisme","tag-proteines"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Causes de la intel\u00b7lig\u00e8ncia humana - Educational Evidence<\/title>\n<meta name=\"description\" content=\"Els ecosistemes de fa m\u00e9s de 2 milions d&#039;anys van potenciar noves dietes carn\u00edvores per als nostres avantpassats. 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