シャドーイング練習: You Actually Share Your Brain With a Silent Stranger - 動画で英語スピーキングを学ぶ
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Your brain is two brains.
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Two hemispheres each doing half the work of being you.
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Half your vision goes to each and half your movement directed by each.
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Right controls left and left controls right.
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Your two brains co-ordinate through a wire of nerves, but this wire can be cut, and was, for a time, used as an epilepsy treatment.
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After the cut, people seemed the same, though their brain was split in-twain.
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Except, some post-split patients described that while selecting their morning outfit with right hand, left might come along to disagree.
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Actually, left hand might quite often disagree, which these split-brain patients found frustrating.
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What's happening?
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To investigate, remember, right brain sees and controls one half, while left brain controls and sees the other.
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But only left brain can speak.
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"Hello." Because that's where the speech center is located.
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Right brain, without this, is mute.
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In normal brains, this doesn't matter because each half communicates across the wire with the other.
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But, split-brains can't, and thus, you can show just the right brain a word, ask the person: "What did you see?", and you'll hear: "Nothing." Because, left speaking brain saw nothing.
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Meanwhile, right brain will use its hand to pick the object out of a pile hidden from left brain.
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This is deeply creepy.
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Ask "Why are you holding the object?" and speaking left brain will make up a plausible sounding, but totally wrong, reason.
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"I always wanted to learn how to solve one of these." Left brain isn't lying; it's just doing what brains do: creating a story that explains its past actions to its current self, a behavior which does rather cast doubt onto the notion of free will .
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Creating reasons for why it does things is just something left brains do.
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It happens in normal, healthy humans all the time, and if you think about it closely, you know you've done this.
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Back to experiments.
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Give right brain an object, ask the person "What's in your hand?" and they won't be able to say.
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"I'm not holding anything." And, when asked to draw, a split-brain can draw two separate objects simultaneously, with each hand, in a way unsplit-brains find challenging.
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These experiments on split-brain patients are deeply unsettling because they really point in the direction of a mute separate... intelligence...
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Something...
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Living in the skull.
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You can even ask questions of a split-brain and get disagreement on the answer.
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So, if your brain is split, who is the 'you' in this situation?
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From the outside, it's tempting to think of the part of the brain that's speaking as the person, but something is hearing and answering questions.
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And, though right brain can't speak, it does understand faces, which left brain can't.
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If this is you, you don't know who your friends and family are in a crowd.
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This act of cutting exposes two minds in one head, and the talking mind doesn't know there's someone else in the house.
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The left brain can describe the situation it's in, but nonetheless will constantly be surprised by right brain's actions and explain them away.
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There's a question to be asked here: Why, after separation, does right brain not totally freak out, but instead plays along helpfully, answering questions, and listening to left-brain's dumb stories about what's happening.
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- It's the best pony... I don't know.
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- Speculation time...
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But, one answer is the cutting doesn't make right brain a separate... intelligence... consciousness... person?
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but rather it has always been. In normal people, perhaps right brain rose up as a companion without a choice.
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Feeling at first somewhat equal partners, but then, as speech develops that it can't participate in, that increasingly becomes the central point of life, it resigns to mutely co-ordinate with left brain.
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At this moment, in your normal head, there are two of you watching this video: one having a 'mind = blown' moment, and the other mentally rolling its eye at the obviousness of it all.
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In split-brains, right doesn't freak out because not a whole lot has really changed.
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You might not agree, and maybe arguing right now at why it can't be possible, exactly as we would expect talking left brain to do.
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Speculation aside, split-brain patients show, at the very least, that in the mind, there is a separate...
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something that can hear and understand and respond, given the right circumstances.
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Your brain isn't entirely yours.
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Who is you?
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You is two.
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But we can go deeper. You are many.
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The pile of meat that's your body is made up of trillions of tiny individuals that have a life of their own.
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So, at which point do the many become one?
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What makes lots of tiny things you?
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Click here to go to our channel and watch the next part.
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Seriously. If you haven't checked out Kurzgesagt, then you don't know what you're missing.
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Kurgaset? Kurtzgaset?
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I never know.
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この動画でスピーキング練習する理由
「脳は2つの脳からできている」という不思議な話題を通して、日常会話だけでなく、説明的なスピーキングや推測的な表現を練習できます。科学的な内容を簡潔に伝えるための語彙や構造が豊富で、英語スピーキング練習に最適です。特にIELTS スピーキング対策にも役立つ、「理由を説明する」「仮説を述べる」といった技能を磨けます。また、シャドーイング（shadow speak）をすることで、ネイティブスピーカーのリズムやイントネーションを自然に身につけられます。
文脈の中の文法と表現
- 「might + 動詞原形」：「Left hand might quite often disagree」のように、可能性や推測を表します。日常会話で「～かもしれない」という柔らかい表現に使えます。
- 「it's tempting to think」：「From the outside, it's tempting to think...」で「～と考えがちです」という意味。意見を述べる際に、客観的な視点を加えるのに便利です。
- 「cast doubt onto」：「cast doubt onto the notion of free will」は「自由意志の概念に疑問を投げかける」という意味。議論や論述で使うと、表現が豊かになります。
発音の注意点
この動画には発音が難しい単語がいくつかあります。「hemispheres」（半球）は「ヘミスフィアーズ」ではなく、「ヘミスフィーズ」と発音します。「epilepsy」（てんかん）は「エピレプシー」で、途中の「レ」を強調しないように注意しましょう。また、「co-ordinate」（調整する）は「コーオーディネイト」ではなく、「コーディネイト」と短く発音されることが多いです。シャドーイングをする際は、これらの単語をゆっくり繰り返し練習してみてください。
この動画を使って、shadow speakやスピーキング練習を続けると、英語の表現力と発音が大幅に向上します。ぜひ挑戦してみてください！
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 | can be cut · was split · is located |
| 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 | you've done · has always been · has really changed |
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。