{"id":2890,"date":"2026-05-29T11:44:23","date_gmt":"2026-05-29T09:44:23","guid":{"rendered":"https:\/\/inablab.org\/quantificant-la-foscor-desenvolupament-dun-sensor-luminic-dual-en-temps-real-integrat-en-un-antifac-per-a-privacio-visual-en-recerca-sobre-percepcio\/"},"modified":"2026-06-16T09:30:06","modified_gmt":"2026-06-16T07:30:06","slug":"quantificant-la-foscor","status":"publish","type":"post","link":"https:\/\/inablab.org\/ca\/quantificant-la-foscor\/","title":{"rendered":"Estem realment a les fosques quan ens tapem els ulls?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Aquest treball presenta un sistema integrat en un antifa\u00e7 capa\u00e7 de mesurar en temps real la llum residual que arriba als ulls durant estudis de privaci\u00f3 visual, permetent quantificar amb precisi\u00f3 els nivells de foscor experimental. Els resultats mostren que l\u2019ajust de l\u2019antifa\u00e7 influeix directament en la quantitat de llum residual, proporcionant una eina \u00fatil per millorar el control experimental i la reproductibilitat en recerca sobre percepci\u00f3. <\/p>\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"948\" height=\"455\" data-src=\"https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors.png\" alt=\"blindfold sensors\" class=\"wp-image-3171 lazyload\" style=\"--smush-placeholder-width: 948px; --smush-placeholder-aspect-ratio: 948\/455;aspect-ratio:2.0835443037974684;width:548px;height:auto\" data-srcset=\"https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors.png 948w, https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors-480x230.png 480w\" data-sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 948px, 100vw\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" \/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"948\" height=\"455\" src=\"https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors.png\" alt=\"blindfold sensors\" class=\"wp-image-3171\" style=\"aspect-ratio:2.0835443037974684;width:548px;height:auto\" srcset=\"https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors.png 948w, https:\/\/inablab.org\/wp-content\/uploads\/2026\/05\/blindfold-sensors-480x230.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 948px, 100vw\" \/><\/noscript><figcaption class=\"wp-element-caption\">Il\u00b7lustraci\u00f3 del sistema de sensors integrat a l&#8217;antifa\u00e7 usat en la investigaci\u00f3.<\/figcaption><\/figure>\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Qu\u00e8 ens va motivar a fer aquest estudi?<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">En molts estudis de percepci\u00f3 i neuroci\u00e8ncia s&#8217;utilitzen antifa\u00e7os per eliminar la informaci\u00f3 visual. Aquesta estrat\u00e8gia \u00e9s habitual quan es vol investigar q\u00fcestions com ara com canvia la nostra percepci\u00f3 quan ens privem temporalment de la vista o fen\u00f2mens relacionats amb la consci\u00e8ncia, l&#8217;atenci\u00f3 o la integraci\u00f3 sensorial. <\/p>\n\n<p class=\"wp-block-paragraph\">Tanmateix, poques vegades es planteja una pregunta senzilla per\u00f2 fonamental: <strong>com sabem que un antifa\u00e7 est\u00e0 bloquejant realment tota la llum?<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Sovint donem per fet que, si una persona percep foscor, aleshores no arriba llum als seus ulls. Per\u00f2 des d&#8217;un punt de vista f\u00edsic i biol\u00f2gic, totes dues coses no s\u00f3n necess\u00e0riament equivalents. Fins i tot quan creiem que estem completament a les fosques, petites quantitats de llum poden continuar travessant l&#8217;antifa\u00e7 a causa del seu ajustament, de la forma del rostre o de les condicions ambientals.  <\/p>\n\n<p class=\"wp-block-paragraph\">La majoria d&#8217;investigacions que utilitzen privaci\u00f3 visual no quantifiquen aquesta possible entrada de llum. Com a conseq\u00fc\u00e8ncia, una variable que podria ser important roman oculta i fora de control. <\/p>\n\n<p class=\"wp-block-paragraph\">Partint d&#8217;aquesta q\u00fcesti\u00f3, vam desenvolupar un sistema capa\u00e7 de mesurar en temps real la quantitat de llum que arriba a l&#8217;interior d&#8217;un antifa\u00e7 utilitzat en recerca cient\u00edfica.<\/p>\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Com ho vam fer?<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Vam dissenyar un sistema de detecci\u00f3 lum\u00ednica integrat directament en un antifa\u00e7 de recerca.<\/strong> Per fer-ho, hi vam incorporar dos sensors extremadament sensibles, un situat davant de cada ull, capa\u00e7os de detectar nivells d&#8217;il\u00b7luminaci\u00f3 de l&#8217;ordre dels microlux, \u00e9s a dir, quantitats de llum molt petites.<\/p>\n\n<p class=\"wp-block-paragraph\">El dispositiu va ser dissenyat per registrar de manera cont\u00ednua la llum present dins de l&#8217;antifa\u00e7 i transmetre les dades en temps real a un ordinador. A m\u00e9s, vam desenvolupar procediments de calibratge que permetien convertir els senyals registrats pels sensors en mesures f\u00edsiques comparables i fiables. <\/p>\n\n<p class=\"wp-block-paragraph\">Un cop constru\u00eft el sistema, el vam avaluar en 67 participants adults. Per fer-ho, vam analitzar com variava la quantitat de llum detectada sota diferents condicions d&#8217;ajustament de l&#8217;antifa\u00e7.<br\/>Es van comparar dues situacions. En la primera, l&#8217;antifa\u00e7 es col\u00b7locava amb l&#8217;ajustament m\u00ednim necessari perqu\u00e8 la persona inform\u00e9s que ja no percebia llum. En la segona, l&#8217;ajustament es feia lleugerament m\u00e9s ferm.<br\/>D&#8217;aquesta manera vam poder estudiar fins a quin punt petites difer\u00e8ncies en la col\u00b7locaci\u00f3 de l&#8217;antifa\u00e7 modificaven la quantitat de llum que arribava realment als ulls. <\/p>\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Quins van ser els principals resultats?<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">Els resultats van mostrar que la foscor no era igual per a tots els participants. Fins i tot quan les persones afirmaven no percebre cap llum, els sensors detectaven petites quantitats d&#8217;il\u00b7luminaci\u00f3 residual a l&#8217;interior de l&#8217;antifa\u00e7. A m\u00e9s, aquesta il\u00b7luminaci\u00f3 variava entre individus.  <\/p>\n\n<p class=\"wp-block-paragraph\">Una de les troballes m\u00e9s rellevants va ser que <strong>un ajustament m\u00e9s ferm de l&#8217;antifa\u00e7 redu\u00efa significativament la quantitat de llum detectada<\/strong>. En altres paraules, petites difer\u00e8ncies en la manera de col\u00b7locar l&#8217;antifa\u00e7 podien modificar el grau real de privaci\u00f3 visual. <\/p>\n\n<p class=\"wp-block-paragraph\">Tamb\u00e9 vam observar difer\u00e8ncies entre el costat esquerre i el dret de l&#8217;antifa\u00e7. Aix\u00f2 suggereix que l&#8217;entrada de llum no es distribueix necess\u00e0riament de manera uniforme i que factors anat\u00f2mics o petites asimetries en l&#8217;ajustament poden influir en la quantitat de llum que arriba a cada ull. <\/p>\n\n<p class=\"wp-block-paragraph\">D&#8217;altra banda, el sistema desenvolupat va demostrar una elevada sensibilitat i precisi\u00f3, essent capa\u00e7 de detectar nivells extremadament baixos d&#8217;il\u00b7luminaci\u00f3 i de registrar canvis molt petits en les condicions experimentals.<\/p>\n\n<p class=\"wp-block-paragraph\">En conjunt, els resultats mostren que la quantitat de llum present dins d&#8217;un antifa\u00e7 no \u00e9s una constant, sin\u00f3 una variable mesurable que pot variar entre persones i entre sessions experimentals.<\/p>\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Quina rellev\u00e0ncia t\u00e9 aix\u00f2?<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">A primera vista podria semblar un detall menor. Tanmateix, la ci\u00e8ncia sovint avan\u00e7a precisament quan deixem de donar per descomptades aquelles coses que considerem evidents. <\/p>\n\n<p class=\"wp-block-paragraph\">Quan un participant afirma que est\u00e0 completament a les fosques, aix\u00f2 significa que no arriba cap llum als seus ulls? O significa simplement que la quantitat de llum present ha caigut per sota del seu llindar conscient de percepci\u00f3? <\/p>\n\n<p class=\"wp-block-paragraph\">La difer\u00e8ncia \u00e9s important, especialment en investigacions sobre percepci\u00f3, consci\u00e8ncia o privaci\u00f3 sensorial, en qu\u00e8 petites variacions en l&#8217;estimulaci\u00f3 visual podrien contribuir a explicar part de la variabilitat observada entre individus o entre estudis realitzats en diferents laboratoris.<\/p>\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong><em>Aquest treball proposa una manera de transformar una suposici\u00f3 en una mesura objectiva. En lloc d&#8217;assumir que existeix foscor, permet quantificar-la. <\/em><\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">M\u00e9s enll\u00e0 de les seves aplicacions metodol\u00f2giques, l&#8217;estudi tamb\u00e9 ens convida a reflexionar sobre una q\u00fcesti\u00f3 m\u00e9s \u00e0mplia: la nostra experi\u00e8ncia subjectiva no sempre reflecteix amb precisi\u00f3 all\u00f2 que est\u00e0 succeint f\u00edsicament en l&#8217;entorn.<\/p>\n\n<p class=\"wp-block-paragraph\">Podem sentir que estem completament a les fosques i, tanmateix, continuar rebent informaci\u00f3 lum\u00ednica.<\/p>\n\n<p class=\"wp-block-paragraph\">Potser la pregunta no \u00e9s \u00fanicament quanta llum hi ha all\u00e0 fora, sin\u00f3 quanta d&#8217;aquesta llum arriba realment fins a nosaltres i de quanta en som capa\u00e7os d&#8217;adonar-nos.<br\/><br\/><a href=\"https:\/\/ieeexplore.ieee.org\/document\/11531051\">Ver publicaci\u00f3n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Aquest treball presenta un sistema integrat en un antifa\u00e7 capa\u00e7 de mesurar en temps real la llum residual que arriba als ulls durant estudis de privaci\u00f3 visual, permetent quantificar amb precisi\u00f3 els nivells de foscor experimental.<\/p>\n","protected":false},"author":8,"featured_media":2885,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[45],"tags":[],"class_list":["post-2890","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-publicacio-cientifica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Estem realment a les fosques quan ens tapem els ulls? 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