Shadowing Practice: This Video Is 2D And 3D Simultaneously: the Pulfrich Effect - Learn English Speaking with Video
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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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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel B2 se basa en el vídeo “This Video Is 2D And 3D Simultaneously: the Pulfrich Effect”. Las palabras que más se repiten: eye, image, frame, effect, camera. Este vídeo tiene 40 frases y 611 palabras para practicar shadowing. La parte hablada dura 3:29. El hablante habla a un ritmo natural de unas 175 palabras por minuto, cercano a una conversación cotidiana. El 85 % de las palabras está entre las 3.000 más comunes del inglés; conviene repasar el resto antes de empezar.
Vocabulario clave de este vídeo
Las 15 palabras más avanzadas del vídeo, con su pronunciación y significado:
| Palabra | Pronunciación | Significado |
|---|---|---|
| sunglasses sustantivo | gafas de sol | |
| stereo sustantivo | /ˈstɛəɹ.i.oʊ/ | estéreo |
| gimmick sustantivo | /ˈɡɪm.ɪk/ | artilugio, efectismo |
| cinema sustantivo | /ˈsɪn.ə.mə/ | cine, cinematógrafo |
| cutaway sustantivo | /ˈkʌtəweɪ/ | chaqué |
| foreground sustantivo | /ˈfɔː(ɹ)ˌɡɹaʊnd/ | primer plano |
| opaque adjetivo | /əʊˈpeɪk/ | opaco |
| optometrist sustantivo | /ɑpˈtɑmətɹɪst/ | optometrista, optómetra |
| polarize verbo | /ˈpəʊ.lə.ɹaɪz/ | polarizar |
| simulate verbo | /ˈsɪm.jə.lət/ | simular |
| squint verbo | /skwɪnt/ | entornar los ojos, entrecerrar los ojos |
| telethon sustantivo | /ˈtɛl.əˌθɒn/ | teletón |
| simultaneous adjetivo | /ˌsaɪ̯.məlˈteɪ̯.ni.əs/ | simultáneo |
| nausea sustantivo | /ˈnɔzi.ə/ | náusea |
| induce verbo | /ɪnˈduːs/ | inducir |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| end up verbo | terminar, ir a parar |
Pronunciación a tener en cuenta
El hablante usa 6 contracciones y formas reducidas, como won't, don't, isn't. Dilas en su forma corta, tal como las oyes.
- Palabras largas — cuida el acento: optometrist /ɑpˈtɑmətɹɪst/, simultaneous /ˌsaɪ̯.məlˈteɪ̯.ni.əs/, ingredient /ɪnˈɡɹiːdi.ənt/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: stereo /ˈstɛəɹ.i.oʊ/, squint /skwɪnt/
- /z/ — sonora, no /s/: polarize /ˈpəʊ.lə.ɹaɪz/, nausea /ˈnɔzi.ə/, confuse /kənˈfjuːz/, bizarre /bɪˈzɑː(ɹ)/, lens /lɛnz/
Cómo practicar con este vídeo
- Escucha el vídeo entero una vez sin hablar y anota las palabras que no conoces.
- Empieza a velocidad 0,75×, haz shadowing frase por frase y vuelve a la velocidad normal cuando te resulte fácil.
- Grábate y compara con el original, prestando atención a palabras como sunglasses, stereo, gimmick.
¿Qué es la Técnica de Shadowing?
Shadowing es una técnica de aprendizaje de idiomas respaldada por la ciencia, desarrollada originalmente para la formación de intérpretes profesionales y popularizada por el políglota Dr. Alexander Arguelles. El método es simple pero poderoso: escuchas audio en inglés nativo y lo repites en voz alta de inmediato, como una sombra que sigue al hablante con solo 1-2 segundos de retraso. A diferencia de la escucha pasiva o los ejercicios de gramática, el shadowing obliga a tu cerebro y músculos de la boca a procesar y reproducir simultáneamente patrones de habla reales. Las investigaciones muestran que mejora significativamente la precisión de la pronunciación, la entonación, el ritmo, el habla conectada, la comprensión auditiva y la fluidez al hablar, convirtiéndola en una de las metodologías más efectivas para la preparación del IELTS Speaking y la comunicación en inglés en el mundo real.