{"id":279965,"date":"2026-11-11T18:30:00","date_gmt":"2026-11-11T21:30:00","guid":{"rendered":"https:\/\/www.em.com.br\/emfoco\/?p=279965"},"modified":"2026-11-10T11:53:02","modified_gmt":"2026-11-10T14:53:02","slug":"todos-no-grupo-escolhem-a-linha-errada-e-um-voluntario-comeca-a-duvidar-do-que-ve-experimento-mostra-a-forca-da-pressao-da-maioria","status":"publish","type":"post","link":"https:\/\/www.em.com.br\/emfoco\/2026\/11\/11\/todos-no-grupo-escolhem-a-linha-errada-e-um-voluntario-comeca-a-duvidar-do-que-ve-experimento-mostra-a-forca-da-pressao-da-maioria\/","title":{"rendered":"Todos no grupo escolhem a linha errada e um volunt\u00e1rio come\u00e7a a duvidar do que v\u00ea: o experimento que mostra a for\u00e7a da press\u00e3o da maioria"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Em experimentos de psicologia social, volunt\u00e1rios comparavam linhas f\u00e1ceis de distinguir, mas ouviam um grupo inteiro dar respostas erradas. Houve press\u00e3o para concordar. O trabalho de <strong>Solomon Asch<\/strong> mostrou como a unanimidade pode influenciar decis\u00f5es p\u00fablicas, sem provar que todos abandonam a pr\u00f3pria percep\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Linhas simples se tornaram um teste de influ\u00eancia social<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Solomon Asch<\/strong> descreveu os experimentos em <a href=\"https:\/\/www.scientificamerican.com\/article\/opinions-and-social-pressure\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>Opinions and Social Pressure<\/strong><\/a>, publicado em 1955. Uma pessoa comparava uma linha padr\u00e3o com tr\u00eas alternativas e deveria identificar aquela de comprimento igual.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A tarefa era f\u00e1cil sem press\u00e3o. A dificuldade surgia quando <strong>colaboradores do pesquisador<\/strong>, apresentados como outros participantes, escolhiam em voz alta a mesma alternativa incorreta em rodadas previamente combinadas.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-1024x576.jpg\" alt=\"Press\u00e3o da maioria e experimento de compara\u00e7\u00e3o de linhas\" class=\"wp-image-280313\" srcset=\"https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-1024x576.jpg 1024w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-300x169.jpg 300w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-768x432.jpg 768w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-750x422.jpg 750w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587-1140x641.jpg 1140w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Drawing_explaining_conformity_ex\u2026_2d936587.jpg 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Press\u00e3o da maioria e experimento de compara\u00e7\u00e3o de linhas<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Por que algu\u00e9m concordaria com uma resposta visivelmente errada?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Quem respondia depois de uma maioria un\u00e2nime enfrentava um <strong>conflito social<\/strong> entre a pr\u00f3pria percep\u00e7\u00e3o e o que todos diziam. Alguns participantes acompanhavam o grupo, enquanto outros mantinham suas respostas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A ades\u00e3o n\u00e3o revela automaticamente um motivo \u00fanico. Evitar discord\u00e2ncia e realmente duvidar do pr\u00f3prio julgamento s\u00e3o <strong>explica\u00e7\u00f5es diferentes<\/strong>, que n\u00e3o podem ser atribu\u00eddas a cada volunt\u00e1rio sem evid\u00eancia.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A seguir, identifique como os pap\u00e9is, a ordem de resposta e a unanimidade criavam press\u00e3o num julgamento visual simples:<\/p>\n\n\n\n<style>\n.cmp10-compare{--cmp10-theme:#A7D2ED;--cmp10-theme-soft:#E8F3FA;--cmp10-theme-ink:#193952;--cmp10-heading-ink:#18394E;--cmp10-rule:#7DAED1;--cmp10-card-bg:#F8F7F4;--cmp10-cell-bg:#F8F7F4;--cmp10-ink:#1D2835;--cmp10-muted:#4E5B69;display:block;width:100%;max-width:100%;margin:18px 0 26px;padding:4px 3px 10px;color:var(--cmp10-ink);font:normal 16px\/1.4 system-ui,-apple-system,\"Segoe UI\",Arial,sans-serif;isolation:isolate;container-type:inline-size;container-name:cmp10}\n.cmp10-compare,.cmp10-compare *, .cmp10-compare *::before,.cmp10-compare 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.cmp10-table,.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody,.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody tr{display:block!important;width:100%!important}\n.cmp10-compare[data-kind=\"table\"] .cmp10-table thead{position:absolute!important;width:1px!important;height:1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important}\n.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody tr{margin:0 0 14px;border:1px solid var(--cmp10-rule)!important;border-radius:12px;overflow:hidden}\n.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody tr>*{display:block!important;width:auto!important;height:auto!important;font-size:14px!important;padding:12px!important;text-align:left!important}\n.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody tr>*:first-child{background:var(--cmp10-theme)!important;color:var(--cmp10-heading-ink)!important;font-size:16px!important}\n.cmp10-compare[data-kind=\"table\"] .cmp10-table tbody td::before{content:attr(data-label)!important;display:block;font-weight:750;margin-bottom:4px}\n}}\n<\/style>\n<section aria-label=\"Comparativo de informa\u00e7\u00f5es\" class=\"google-auto-ads-ignore cmp10-compare cmp10-compare--c4\" data-kind=\"cards\" data-model=\"CARD-04\" role=\"region\" data-palette=\"azul-claro\" data-surface=\"offwhite\" style=\"--cmp10-theme:#A7D2ED;--cmp10-theme-soft:#E8F3FA;--cmp10-theme-ink:#193952\">\n<div class=\"cmp10-grid\" role=\"list\">\n<article aria-label=\"Informa\u00e7\u00e3o comparativa\" class=\"cmp10-card cmp10-card--lite\" role=\"listitem\">\n<div class=\"cmp10-card__top\"><strong class=\"cmp10-card__title\">Linha padr\u00e3o<\/strong><\/div>\n<div class=\"cmp10-card__facts\"><div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">A pessoa via uma linha de refer\u00eancia.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Precisava comparar comprimentos.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">A resposta correta era visualmente acess\u00edvel.<\/span><\/div><\/div>\n<div class=\"cmp10-card__foot\"><strong class=\"cmp10-price\">Tarefa simples<\/strong><\/div>\n<\/article>\n<article aria-label=\"Informa\u00e7\u00e3o comparativa\" class=\"cmp10-card cmp10-card--plus\" role=\"listitem\">\n<div class=\"cmp10-card__top\"><strong class=\"cmp10-card__title\">Colaboradores<\/strong><\/div>\n<div class=\"cmp10-card__facts\"><div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Outros presentes seguiam instru\u00e7\u00f5es.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Em rodadas espec\u00edficas, erravam juntos.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">N\u00e3o eram todos participantes ing\u00eanuos.<\/span><\/div><\/div>\n<div class=\"cmp10-card__foot\"><strong class=\"cmp10-price\">Maioria preparada<\/strong><\/div>\n<\/article>\n<article aria-label=\"Informa\u00e7\u00e3o comparativa\" class=\"cmp10-card cmp10-card--pro\" role=\"listitem\">\n<div class=\"cmp10-card__top\"><strong class=\"cmp10-card__title\">Resposta p\u00fablica<\/strong><\/div>\n<div class=\"cmp10-card__facts\"><div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">O volunt\u00e1rio falava em voz alta.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Ouvia a maioria antes de responder.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Isso criava poss\u00edvel tens\u00e3o social.<\/span><\/div><\/div>\n<div class=\"cmp10-card__foot\"><strong class=\"cmp10-price\">Ordem decisiva<\/strong><\/div>\n<\/article>\n<article aria-label=\"Informa\u00e7\u00e3o comparativa\" class=\"cmp10-card cmp10-card--best\" role=\"listitem\">\n<div class=\"cmp10-card__top\"><strong class=\"cmp10-card__title\">Unanimidade<\/strong><\/div>\n<div class=\"cmp10-card__facts\"><div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Os colaboradores indicavam a mesma op\u00e7\u00e3o.<\/span><\/div><div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">A press\u00e3o vinha de respostas concordantes.<\/span><\/div>\n<div class=\"cmp10-fact\"><span class=\"cmp10-fact__text\">Nem todos os volunt\u00e1rios aderiram.<\/span><\/div><\/div>\n<\/article>\n<\/div>\n<\/section>\n\n\n\n<h2 class=\"wp-block-heading\">As condi\u00e7\u00f5es que explicam o resultado do estudo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O procedimento dependia da combina\u00e7\u00e3o entre uma <strong>compara\u00e7\u00e3o simples<\/strong> e uma maioria que errava deliberadamente. Ele inclu\u00eda:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Linha padr\u00e3o:<\/strong> comprimento de refer\u00eancia exibido \u00e0 turma.<\/li>\n\n\n\n<li><strong>Tr\u00eas op\u00e7\u00f5es:<\/strong> uma tinha exatamente a mesma medida.<\/li>\n\n\n\n<li><strong>Grupo combinado:<\/strong> colaboradores apontavam uma op\u00e7\u00e3o errada.<\/li>\n\n\n\n<li><strong>Resposta p\u00fablica:<\/strong> o participante genu\u00edno respondia depois.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">O fen\u00f4meno de <a href=\"https:\/\/www.em.com.br\/emfoco\/2026\/09\/18\/a-psicologia-explica-por-que-estar-cercado-de-pessoas-pode-fazer-alguem-esperar-que-outra-pessoa-tome-a-iniciativa-quando-alguma-coisa-acontece\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>esperar que outra pessoa tome iniciativa<\/strong><\/a> tamb\u00e9m envolve grupos, mas sua l\u00f3gica difere da <strong>conformidade de respostas<\/strong> medida por Asch.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-1024x576.jpg\" alt=\"Press\u00e3o da maioria e experimento de compara\u00e7\u00e3o de linhas\" class=\"wp-image-280314\" srcset=\"https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-1024x576.jpg 1024w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-300x169.jpg 300w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-768x432.jpg 768w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-750x422.jpg 750w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72-1140x641.jpg 1140w, https:\/\/www.em.com.br\/emfoco\/wp-content\/uploads\/2026\/11\/Adults_examining_length_comparis\u2026_970c7f72.jpg 1280w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">Press\u00e3o da maioria e experimento de compara\u00e7\u00e3o de linhas<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">Todos os volunt\u00e1rios seguiram a maioria?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u00e3o. No estudo resumido, 123 participantes passaram por 18 rodadas, com respostas erradas un\u00e2nimes em 12 delas. A concord\u00e2ncia com o grupo foi observada em cerca de <strong>36,8% dos julgamentos cr\u00edticos<\/strong>, n\u00e3o em todas as decis\u00f5es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sem press\u00e3o, a taxa de erro na compara\u00e7\u00e3o simples ficou abaixo de <strong>1%<\/strong>. O protocolo hist\u00f3rico pode ser consultado tamb\u00e9m em uma <a href=\"https:\/\/web.mit.edu\/curhan\/www\/docs\/Articles\/15341_Readings\/Influence_Compliance\/Asch_1955_Opinions_and_social_pressure.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>c\u00f3pia do artigo original<\/strong><\/a>; n\u00e3o \u00e9 pesquisa independente nem previs\u00e3o universal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compare os n\u00fameros do protocolo de Asch distinguindo participantes, rodadas e respostas cr\u00edticas:<\/p>\n\n\n\n<style>\n.cmp10-compare{--cmp10-theme:#A7D2ED;--cmp10-theme-soft:#E8F3FA;--cmp10-theme-ink:#193952;--cmp10-heading-ink:#18394E;--cmp10-rule:#7DAED1;--cmp10-card-bg:#F8F7F4;--cmp10-cell-bg:#F8F7F4;--cmp10-ink:#1D2835;--cmp10-muted:#4E5B69;display:block;width:100%;max-width:100%;margin:18px 0 26px;padding:4px 3px 10px;color:var(--cmp10-ink);font:normal 16px\/1.4 system-ui,-apple-system,\"Segoe 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td::before{content:attr(data-label)!important;display:block;font-weight:750;margin-bottom:4px}\n}}\n<\/style>\n<section aria-label=\"Comparativo de informa\u00e7\u00f5es\" class=\"google-auto-ads-ignore cmp10-compare cmp10-compare--t4\" data-kind=\"table\" data-model=\"TABLE-04\" role=\"region\" data-palette=\"azul-claro\" data-surface=\"offwhite\" style=\"--cmp10-theme:#A7D2ED;--cmp10-theme-soft:#E8F3FA;--cmp10-theme-ink:#193952\">\n<div class=\"cmp10-scroll\">\n<table class=\"cmp10-table\">\n<caption class=\"cmp10-sr-only\">N\u00fameros do experimento de conformidade descrito em 1955<\/caption>\n<thead><tr><th scope=\"col\">Medida<\/th><th scope=\"col\">Valor original<\/th><th scope=\"col\">Unidade correta<\/th><th scope=\"col\">Interpreta\u00e7\u00e3o necess\u00e1ria<\/th><\/tr><\/thead>\n<tbody><tr>\n<th data-label=\"Medida\" scope=\"row\">Amostra<\/th>\n<td data-label=\"Valor original\">123<\/td>\n<td data-label=\"Unidade correta\">Pessoas em condi\u00e7\u00e3o experimental<\/td>\n<td data-label=\"Interpreta\u00e7\u00e3o necess\u00e1ria\"><strong class=\"cmp10-price\">N\u00e3o significa 123 conformistas<\/strong><\/td>\n<\/tr>\n<tr>\n<th data-label=\"Medida\" scope=\"row\">Sequ\u00eancia<\/th>\n<td data-label=\"Valor original\">18 rodadas; 12 cr\u00edticas<\/td>\n<td data-label=\"Unidade correta\">Julgamentos por participante<\/td>\n<td data-label=\"Interpreta\u00e7\u00e3o necess\u00e1ria\"><strong class=\"cmp10-price\">Press\u00e3o n\u00e3o ocorreu em todas<\/strong><\/td>\n<\/tr>\n<tr>\n<th data-label=\"Medida\" scope=\"row\">Concord\u00e2ncia errada<\/th>\n<td data-label=\"Valor original\">36,8%<\/td>\n<td data-label=\"Unidade correta\">Respostas nos julgamentos cr\u00edticos<\/td>\n<td data-label=\"Interpreta\u00e7\u00e3o necess\u00e1ria\"><strong class=\"cmp10-price\">N\u00e3o percentual de pessoas sempre errando<\/strong><\/td>\n<\/tr><\/tbody>\n<\/table>\n<\/div>\n<\/section>\n\n\n<h2>Unanimidade e possibilidade de discordar fazem diferen\u00e7a<\/h2>\n<p>A influ\u00eancia da maioria depende do desenho da tarefa, da presen\u00e7a de discord\u00e2ncia e das condi\u00e7\u00f5es de resposta. A experi\u00eancia n\u00e3o prova que pessoas sejam sempre incapazes de <strong>resistir \u00e0 press\u00e3o<\/strong>.<\/p>\n<p>A percep\u00e7\u00e3o de <a href=\"https:\/\/www.em.com.br\/emfoco\/2026\/10\/10\/a-psicologia-explica-por-que-o-mesmo-rosto-pode-parecer-mais-atraente-em-uma-foto-de-grupo-do-que-sozinho\/\" target=\"_blank\" rel=\"noopener noreferrer\"><strong>rostos em fotos de grupo<\/strong><\/a> \u00e9 outra pergunta da psicologia. Aqui, a medi\u00e7\u00e3o estava na <strong>resposta p\u00fablica<\/strong> diante de um grupo que contrariava evid\u00eancias visuais.<\/p>\n<p>O v\u00eddeo abaixo oferece uma demonstra\u00e7\u00e3o complementar da compara\u00e7\u00e3o de linhas e da influ\u00eancia social:<\/p>\n<div class=\"jeg_video_container jeg_video_content\"><iframe loading=\"lazy\" title=\"S01E07 - Conformidade e Influ\u00eancia Social: O experimento de Solomon Asch\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/h1ci1056MKA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<h2>O que os resultados mostram sobre decis\u00f5es em grupo?<\/h2>\n<p>Em certas condi\u00e7\u00f5es, uma maioria un\u00e2nime pode deslocar julgamentos mesmo numa tarefa simples. A <strong>press\u00e3o social<\/strong> n\u00e3o tornou todos os participantes igualmente suscet\u00edveis nem eliminou a capacidade de discord\u00e2ncia.<\/p>\n<p>O experimento mostra uma possibilidade concreta de <strong>influ\u00eancia coletiva<\/strong>, com limites e varia\u00e7\u00f5es. Ele n\u00e3o autoriza concluir que toda pessoa seguir\u00e1 o grupo em qualquer situa\u00e7\u00e3o cotidiana.<\/p>","protected":false},"excerpt":{"rendered":"<p>Em experimentos de psicologia social, volunt\u00e1rios comparavam linhas f\u00e1ceis de distinguir, mas ouviam um grupo inteiro dar respostas erradas. Houve press\u00e3o para concordar. O trabalho de Solomon Asch mostrou como a unanimidade pode influenciar decis\u00f5es p\u00fablicas, sem provar que todos abandonam a pr\u00f3pria percep\u00e7\u00e3o. Linhas simples se tornaram um teste de influ\u00eancia social Solomon Asch [&hellip;]<\/p>\n","protected":false},"author":36,"featured_media":280312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jnews-multi-image_gallery":[],"jnews_single_post":{"format":"standard"},"jnews_primary_category":[],"jnews_social_meta":[],"jnews_override_counter":[],"footnotes":""},"categories":[8819],"tags":[3228,6223,5155,36960],"class_list":["post-279965","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-conformidade","tag-pressao-social","tag-psicologia","tag-solomon-asch"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Todos no grupo escolhem a linha errada e um volunt\u00e1rio come\u00e7a a duvidar do que v\u00ea: o experimento que mostra a for\u00e7a da press\u00e3o da maioria - Estado de Minas - 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