celule<\/a>\u00a0se suprapune. \u00cen cazul conurilor M, cele care r\u0103spund \u00een special la lungimi de und\u0103 medii, nu exist\u0103 \u00een natur\u0103 o lumin\u0103 capabil\u0103 s\u0103 le stimuleze exclusiv, f\u0103r\u0103 s\u0103 activeze \u0219i conurile L sau S.<\/p>\nDe aici a pornit ideea cercet\u0103torului Ren Ng, de la Universitatea California din Berkeley. Acesta s-a \u00eentrebat ce ar putea vedea creierul dac\u0103 oamenii de \u0219tiin\u021b\u0103 ar reu\u0219i s\u0103 activeze numai conurile M.<\/p>\n
Potrivit publica\u021biei citate, pentru experiment, Ng a colaborat cu Austin Roorda, cercet\u0103tor specializat \u00een studiul vederii. Laboratorul lui Roorda dezvoltase o tehnologie capabil\u0103 s\u0103 identifice individual celulele din retin\u0103 \u0219i s\u0103 direc\u021bioneze asupra lor impulsuri microscopice de lumin\u0103. Cercet\u0103torii au construit astfel sistemul Oz, care poate urm\u0103ri permanent pozi\u021bia ochiului \u0219i poate direc\u021biona fasciculul laser c\u0103tre celulele selectate.<\/p>\n
publicitate”); background-position: center center; background-repeat: no-repeat;”><\/p>\n
\u201eOlo\u201d, o culoare descris\u0103 ca un verde-alb\u0103strui extrem de intens <\/p>\n
\u00cen cadrul experimentului, sistemul a activat mii de conuri M, \u00eencerc\u00e2nd s\u0103 le lase neactivate pe celelalte tipuri de conuri. Rezultatul a fost experien\u021ba vizual\u0103 numit\u0103 \u201eolo\u201d.<\/p>\n
Participan\u021bii au descris-o \u00een mod asem\u0103n\u0103tor: un verde-alb\u0103strui extrem de saturat, apropiat de verdele unui p\u0103un. Unul dintre cercet\u0103tori a comparat culoarea cu cea mai intens\u0103 nuan\u021b\u0103 natural\u0103 de verde pe care a g\u0103sit-o, afirm\u00e2nd c\u0103 aceasta p\u0103rea mult mai palid\u0103 prin compara\u021bie.<\/p>\n
Culoarea, numit\u0103 \u201eolo\u201d, a fost perceput\u0103 ini\u021bial de doar cinci persoane, iar ulterior num\u0103rul celor care au experimentat-o a ajuns la \u0219apte.<\/p>\n
Un detaliu al experimentului a fost considerat deosebit de important. Atunci c\u00e2nd cercet\u0103torii au introdus o mic\u0103 eroare \u00een direc\u021bionarea fasciculului laser, participan\u021bii au \u00eencetat s\u0103 mai vad\u0103 \u201eolo\u201d \u0219i au perceput \u00een schimb verdele obi\u0219nuit.<\/p>\n
Acest lucru sugereaz\u0103 c\u0103 senza\u021bia nu era pur \u0219i simplu rezultatul unei lumini verzi foarte intense, ci depindea de stimularea foarte precis\u0103 a conurilor M.<\/p>\n
De ce nu poate fi fotografiat\u0103 noua culoare <\/p>\n
\u201eOlo\u201d nu poate fi fotografiat\u0103 sau reprodus\u0103 pe un monitor, deoarece cercet\u0103torii nu au creat o nou\u0103 lungime de und\u0103 a luminii. Experien\u021ba apare prin modificarea semnalelor transmise c\u0103tre creier de celulele din retin\u0103.<\/p>\n
Denumirea \u201eolo\u201d vine chiar de la modelul de activare a conurilor: 0-1-0, adic\u0103 celulele L sunt inactive, cele M sunt activate, iar celulele S sunt inactive.<\/p>\n
publicitate”); background-position: center center; background-repeat: no-repeat;”><\/p>\n
\u00cen condi\u021bii naturale, ochiul uman nu \u00eent\u00e2lne\u0219te acest tip de semnal.<\/p>\n
Tehnologia ar putea ajuta cercetarea daltonismului <\/p>\n
Experimentul nu are doar rolul de a produce o experien\u021b\u0103 vizual\u0103 neobi\u0219nuit\u0103. Cercet\u0103torii sper\u0103 ca sistemul Oz s\u0103 poat\u0103 fi folosit pentru a \u00een\u021belege mai bine bolile retinei \u0219i deficien\u021bele de vedere a culorilor.<\/p>\n
Oamenii de \u0219tiin\u021b\u0103 pot folosi tehnologia pentru a simula pierderea anumitor celule conice la persoane s\u0103n\u0103toase. Astfel, pot observa mai exact cum afecteaz\u0103 vederea pierderea progresiv\u0103 a acestor celule.<\/p>\n
Cercetarea ar putea avea implica\u021bii \u0219i pentru dezvoltarea unor tratamente precum terapiile genetice sau cele bazate pe celule stem.<\/p>\n
De asemenea, cercet\u0103torii vor s\u0103 afle dac\u0103 aceea\u0219i tehnologie poate modifica temporar experien\u021ba vizual\u0103 a unor persoane cu deficien\u021be de vedere a culorilor sau dac\u0103 poate permite unor persoane cu vedere tricromatic\u0103 s\u0103 experimenteze forme de percep\u021bie apropiate de vederea tetracromatic\u0103.<\/p>\n
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Berkeley a reu\u0219it s\u0103 provoace oamenilor o experien\u021b\u0103 vizual\u0103…\n","protected":false},"author":2,"featured_media":269584,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[12],"tags":[32,33,31,27543,36,37,27,74,34,35,25,74472,74471,41,40,38,39,74470,26,28,29,30,71,72,73],"class_list":["post-269583","post","type-post","status-publish","format-standard","has-post-thumbnail","category-international","tag-breaking-news","tag-breakingnews","tag-cele-mai-populare-subiecte","tag-daltonism","tag-featured-news","tag-featurednews","tag-headlines","tag-international","tag-latest-news","tag-latestnews","tag-news","tag-olo","tag-retina","tag-ro","tag-romana","tag-romania","tag-romanian","tag-sistemul-oz","tag-stiri","tag-titluri","tag-top-stories","tag-topstories","tag-world","tag-world-news","tag-worldnews"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@ro\/117128166991046483","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/posts\/269583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/comments?post=269583"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/posts\/269583\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/media\/269584"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/media?parent=269583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/categories?post=269583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/ro\/wp-json\/wp\/v2\/tags?post=269583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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<\/p>\n