Prática de Shadowing: This Video Is 2D And 3D Simultaneously: the Pulfrich Effect - Aprenda a falar inglês com vídeo

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This video is in 3D.
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Really, it is.
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If you get a pair of sunglasses and you just cover your right eye, you should see a 3D effect.
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I mean, assuming both your eyes work, obviously.
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Sorry, if they don't.
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The effect will work best on a big, bright screen, in a bright room, wearing dark sunglasses, and if your device is playing this at a high frame rate.
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If you're just kind of lying in bed, squinting and holding your phone out, it probably won't work.
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Also, you'd look ridiculous.
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Normal 3D video works by sending a different picture to each eye.
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Those two simultaneous images, one for the left eye, one for the right, are called a stereo pair, and they simulate what you would see with two eyes.
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So, you display two images on the same screen at the same time, and then you use filters to show only one to each eye.
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And that might be using a red and blue image in coloured filters, or weird tech glasses where each lens goes opaque 60 times a second, or, in a modern cinema,
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glasses that filter using polarized light.
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But because there have to be two separate images on the same screen at the same time, for anyone not wearing those glasses, it's a confusing mess.
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But this video here works as a normal 2D video as well, at the same time, and the reason is something called the Pulfric effect,
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named after Karl Pulfric, the German optometrist who first documented it in the early 20th century.
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Your eyes and brain take a little bit longer to process dark images than light ones.
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Now exactly how long depends on the relative brightness of the images, but usually roughly around the length of one frame of video,
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which is pretty useful for something first noted nearly a century ago.
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If you put dark sunglasses over your right eye, then the image from that eye will get delayed by about one frame on its way through your brain.
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So you end up seeing two different images, one frame apart, in time.
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But that's not enough to create a stereo pair on its own.
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The other ingredient is the bizarre, nausea -inducing, moving camera.
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Because that camera has constantly been in motion, your right eye has been lagging behind by about one frame, just as if there was a second camera just to the right of that one,
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giving you a separate stereo image to your right eye.
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Now, that's a stereo pair, so if we stop the camera rotating, the effect disappears and everyone can take a breath.
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That also works by moving the objects in the frame.
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That's why, earlier, the cutaways I used had constantly moving backgrounds.
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And sure, it's not perfect 3D, but your brain fills in the gaps.
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The Pulp Rik effect works well enough that it's been used for TV shows occasionally and for a couple of video games.
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In the 90s, the BBC had a special series of 3D shows for a charity telethon, including one of the worst Doctor Who productions ever made.
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Who's that terrible woman?
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But if you look at it, in every shot, something in the foreground moves left to right, and something in the background moves right to left, constantly.
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So because every camera shot has to be carefully planned, and in constant motion, you won't see Pulp Frick Effect videos in the cinema any time soon,
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it isn't practical for anything more than quick, short gimmicks.
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Gimmicks like this video.
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You can take the sunglasses off.
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One take!
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One take!
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Wait, did I go the right way there?

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Vocabulário e dicas de fala para esta lição

Esta aula de conversação de nível B2 usa o vídeo “This Video Is 2D And 3D Simultaneously: the Pulfrich Effect”. As palavras que mais se repetem: eye, image, frame, effect, camera. Este vídeo tem 40 frases e 611 palavras para praticar shadowing. A fala dura 3:29. O falante fala em ritmo natural, cerca de 175 palavras por minuto, próximo de uma conversa do dia a dia. 85% das palavras estão entre as 3.000 mais comuns do inglês; vale a pena estudar o restante antes de começar.

Vocabulário principal deste vídeo

As 15 palavras mais avançadas do vídeo, com pronúncia e significado:

PalavraPronúnciaSignificado
sunglasses substantivoóculos de sol, óculos escuros
stereo substantivo/ˈstɛəɹ.i.oʊ/estéreo
gimmick substantivo/ˈɡɪm.ɪk/artimanha
cinema substantivo/ˈsɪn.ə.mə/cinema
foreground substantivo/ˈfɔː(ɹ)ˌɡɹaʊnd/primeiro plano
opaque adjetivo/əʊˈpeɪk/opaco
optometrist substantivo/ɑpˈtɑmətɹɪst/oculista
polarize verbo/ˈpəʊ.lə.ɹaɪz/polarizar
simulate verbo/ˈsɪm.jə.lət/simular
squint verbo/skwɪnt/semicerrar os olhos
simultaneous adjetivo/ˌsaɪ̯.məlˈteɪ̯.ni.əs/simultâneo
nausea substantivo/ˈnɔzi.ə/náusea, enjoo
induce verbo/ɪnˈduːs/induzir
brightness substantivo/ˈbɹaɪtnəs/brilho, claridade
rotate verbo/ˈɹoʊ.teɪt/rotar, girar

Phrasal verbs que você vai ouvir

PalavraSignificado
end up verboterminar, acabar

Gramática neste vídeo

As estruturas que o falante mais usa, com as palavras exatas do vídeo:

EstruturaNo vídeo
Voz passiva be + particípio passado — o foco está no que acontece, não em quem fazare called · been used · be carefully planned
Present perfect have/has + particípio passado — uma ação passada que ainda importa agorahas constantly been · it's been

Pronúncia para ficar de olho

O falante usa 6 contrações e formas reduzidas, como won't, don't, isn't. Diga-as na forma curta, do jeito que você ouve.

  • Palavras longas — acerte a sílaba tônica: optometrist /ɑpˈtɑmətɹɪst/, simultaneous /ˌsaɪ̯.məlˈteɪ̯.ni.əs/, ingredient /ɪnˈɡɹiːdi.ənt/

Sons difíceis para falantes de português:

  • Consoante final — sem acrescentar um “i” depois: gimmick /ˈɡɪm.ɪk/, foreground /ˈfɔː(ɹ)ˌɡɹaʊnd/, opaque /əʊˈpeɪk/, optometrist /ɑpˈtɑmətɹɪst/, simulate /ˈsɪm.jə.lət/
  • s + consoante no início — sem um “i” antes: stereo /ˈstɛəɹ.i.oʊ/, squint /skwɪnt/

Como praticar com este vídeo

  1. Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
  2. Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
  3. Grave a sua voz e compare com o original, prestando atenção a palavras como sunglasses, stereo, gimmick.

O que é a Técnica de Shadowing?

Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.

Técnica de shadowing: leia o guia completo passo a passo →