Shadowing Practice: The Habits That Keep Your Brain Sharp | Dr. Sanjay Gupta - World Governments Summit - Learn English Speaking with Video
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The brain can not only stay healthy throughout your entire life, but also continue to improve.
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He is Dr. Sanjay Gupta, American neurosurgeon and the chief medical correspondent for CNN.
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And there's now a way that we realize and appreciate that within our skulls is an entire universe.
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As our imaging grew more sophisticated, we started to see what the healthy brain really does look like.
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and it's we talk a lot about the health of our bodies
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but not as much about our brains
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and i think for a lot of people there's this belief
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that the brain is something that's not capable of really being optimized
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or maintained i've been a neurosurgeon for some 25 years now
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and i think a lot of people think about the brain
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sort of as a black box you measure a black box by its inputs and its outputs,
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but you don't really get to see the inner workings of the brain.
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And I think that's why people have thought for a long time that it's immutable.
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It's incapable of being changed in some way.
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The brain is static and it's fixed.
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And one of the things I really wanted to convey to all of you today is that that's not the case.
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Perhaps more than any other organ in the body, the brain can not only stay healthy throughout your entire life,
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but also continue to improve.
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Over the last quarter century, we learned something that was pretty revelatory in the world of neuroscience.
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We learned that you could continue to grow new brain cells at any age.
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The conventional wisdom, even what I learned when I was studying neuroscience a quarter century ago,
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was you got a certain number of neurons and that was basically what you got.
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You drained the cash over the years of your life.
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But that's not the case.
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We believe that in part because the only time we really inspected the black box was when there was a problem, when there was a tumor or trauma.
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We did not get to see the brain in sort of its healthy state.
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We did not get to understand how the brain behaved most of the time.
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As our imaging grew more sophisticated, we started to see what the healthy brain really does look like.
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And it's stunning.
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Inside your skulls right now, your brain is pulsing.
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It's robust.
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It's changing.
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And it's growing.
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And there's now a way that we realize and appreciate that within our skulls is an entire universe.
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There are more neurons in your brain than there are stars in the sky.
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I spent a lot of time talking to scientists who worked on this research and I asked them, how do they fundamentally live their lives now differently because of what they've learned?
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And the way
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that I sort of broke this down is into the big buckets of how we live our lives through movement,
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through nourishment, through rest, through connection, and through discovery.
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I think movement is the most reliable way to grow new brain cells.
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The more you move, the more you are sending signals essentially to your entire body that you want to be here, that you want to be healthy.
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But most remarkably, you're sending a signal for the brain to create a substance known as BDNF, brain-derived neurotrophic factor.
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You don't need to remember that, but think of that as sort of the miracle grow for the brain, as one scientist put it to me.
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It's the substance that is actually promoting that neurogenesis, telling new brain cells to grow.
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You cannot ingest it.
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You cannot eat it.
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It can only be made by your own body.
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The brain is very sensitive to glucose.
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So as your blood glucose starts to really rise, the receptors in the brain, instead of absorbing all that energy, they turn off.
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They simply stop absorbing any energy.
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So at the same time, you're eating a really, really calorie-dense meal full of a lot of sugar.
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You could be overstuffing your body and starving your brain at the same time.
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That's a difference between the brain and the rest of the body.
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Hydration, critically important for all functions hydration is one of the substrates that is necessary for BDNF,
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but one needs to keep in mind that the brain itself is 85% water.
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What that means is just 1% dehydration can lead to a 5% decrease in cognitive function.
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1%.
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I mean, I think this is one of the most under-recognized things that we talk about with regard to cognition overall.
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A 2% decrease in hydration can result in acute short-term memory loss, objective problems with mathematical computations,
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and an inability to store long-term memories.
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Just 2%.
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So sugar and water, so critical when it comes to brain health for those reasons.
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Sleep, rest, again, we know is important.
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But for the brain, sleep is not a period of inactivity.
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In fact, it's one of the most metabolically active times for the brain.
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And we know that your brain is constantly creating waste products and those waste products are constantly being cleared,
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but it is during sleep when that waste clearance is most efficient.
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Sleep is really important for clearing away some of the substrates that may be the precursors to things like amyloid plaque,
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which is associated with Alzheimer's disease.
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We also know that sleep is when you actually take your short-term memories
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and you actually put them into a long-term memory store.
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Vocabulario y notas de pronunciación para esta lección
Esta lección de conversación de nivel C1 se basa en el vídeo “The Habits That Keep Your Brain Sharp”. Las palabras que más se repiten: brain, healthy, sleep, entire, learned. Este vídeo tiene 70 frases y 922 palabras para practicar shadowing. La parte hablada dura 5:34. El hablante habla a un ritmo natural de unas 166 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 |
|---|---|---|
| hydration sustantivo | /haɪˈdɹeɪʃən/ | hidratación |
| skull sustantivo | /ˈskʌl/ | cráneo, calavera |
| neuron sustantivo | /ˈn(j)ʊɹɑn/ | neurona |
| neuroscience sustantivo | neurocienca | |
| neurosurgeon sustantivo | neurocirujano, neurocirujana | |
| glucose sustantivo | /ˈɡluː.kəʊz/ | glucosa |
| absorb verbo | /æbˈsɔɹb/ | absorber |
| sophisticated adjetivo | de mundo, sofisticado | |
| amyloid sustantivo | /ˈæmɪlɔɪd/ | amiloide |
| cognition sustantivo | /kɑɡˈnɪʃ.ən/ | cognición |
| computation sustantivo | /ˌkɑmpjʊˈteɪʃn̩/ | cálculo, cómputo |
| dehydration sustantivo | /dihaɪˈdɹeɪʃən/ | deshidratación |
| immutable adjetivo | inmutable | |
| inactivity sustantivo | /ˌɪn.ækˈtɪ.vɪ.ti/ | ociosidad, inactividad |
| ingest verbo | /ɪnˈd͡ʒɛst/ | ingerir, deglutir |
Phrasal verbs que vas a escuchar
| Palabra | Significado |
|---|---|
| turn off verbo | apagar |
Gramática en este vídeo
Las estructuras que más usa el hablante, con las palabras exactas del vídeo:
| Estructura | En el vídeo |
|---|---|
| Voz pasiva be + participio pasado — importa lo que ocurre, no quién lo hace | being optimized · being changed · be made |
| Present perfect have/has + participio pasado — una acción pasada que sigue importando ahora | i've been · have thought · they've learned |
Pronunciación a tener en cuenta
El hablante usa 6 contracciones y formas reducidas, como don't, you're, I've. Dilas en su forma corta, tal como las oyes.
- Los sonidos de “sh” y “zh”: hydration /haɪˈdɹeɪʃən/, cognition /kɑɡˈnɪʃ.ən/, computation /ˌkɑmpjʊˈteɪʃn̩/, dehydration /dihaɪˈdɹeɪʃən/, nourishment /ˈnɝɪʃmənt/
- Palabras largas — cuida el acento: dehydration /dihaɪˈdɹeɪʃən/, inactivity /ˌɪn.ækˈtɪ.vɪ.ti/, revelatory [ˈɹɛvələtoɹi], remarkably /ɹɪˈmɑɹkəbli/, correspondent /ˌkɔɹ.ɪˈspɑn.dənt/
Sonidos difíciles para hispanohablantes:
- s + consonante al inicio — sin añadir una “e” delante: skull /ˈskʌl/, starve /stɑɹv/, static /ˈstæt.ɪk/
- /v/ — no es /b/: los dientes tocan el labio inferior: inactivity /ˌɪn.ækˈtɪ.vɪ.ti/, revelatory [ˈɹɛvələtoɹi], derive /dɪˈɹaɪv/, starve /stɑɹv/, convey /kənˈveɪ/
- /z/ — sonora, no /s/: glucose /ˈɡluː.kəʊz/, optimize /ˈɑptɪmaɪz/
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 hydration, skull, neuron.
¿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.