シャドーイング練習: The Habits That Keep Your Brain Sharp | Dr. Sanjay Gupta - World Governments Summit - 動画で英語スピーキングを学ぶ
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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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日常生活の中の脳健康と英語学習の共通点
Dr. Sanjay Guptaが語る「脳を鋭く保つ習慣」についてのビデオは、科学的知見をもとにした実用的なアドバイスが満載です。英語スピーキング練習をする上でも、脳の働きを理解することは大切です。動画で英語学習をする際、話者の発音やリズムを追うことで、脳の神経回路が活性化し、言語能力向上につながるのです。
実用的なフレーズとコロケーション
- continue to improve：「継続的に向上する」。例："The brain can continue to improve throughout life."（脳は生涯を通じて向上し続けることができる）
- conventional wisdom：「従来の知見」。例："The conventional wisdom was that we have a fixed number of neurons."（従来の知見では、ニューロンの数は固定的だとされていた）
- brain-derived neurotrophic factor (BDNF)：「脳由来神経栄養因子」。略称も覚えておくと便利です。
- promoting neurogenesis：「神経新生を促進する」。ビデオで頻繁に登場する重要なフレーズです。
あなたのシャドーイングチャレンジ
今すぐ取り組める課題を紹介します。ビデオを1分程度再生し、Dr. Guptaの発音とリズムを真似て「shadowspeak」してみてください。特に「The brain is pulsing, it's robust, it's changing.」という部分に注目し、強勢やイントネーションを再現しましょう。この練習はIELTSスピーキング対策にも有効で、英語の発音を良くするだけでなく、自然なスピーチのリズムを身につけることができます。毎日5分間続けると、短期間で成果が現れるでしょう。
動画で英語学習をする際は、単に聞くだけでなく、口に出して真似ることが重要です。これが英語スピーキング練習の秘訣です。ぜひ今日から取り組んでみてください。
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | being optimized · being changed · be made |
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | i've been · have thought · they've learned |
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。