シャドーイング練習: What staying up all night does to your brain - Anna Rothschild - YouTubeで英語スピーキングを学ぶ
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You're just one Roman Empire history final away from a relaxing spring break.
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You're just one Roman Empire history final away from a relaxing spring break.
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But you still have so much to study,
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so you decide to follow in the footsteps of many students before you and pull an all-nighter.
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When you stay up all night,
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you're fighting against your body's natural circadian rhythms.
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These are the cyclical changes that virtually all living things experience over the course of a 24-hour period,
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such as sleeping and waking.
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And they're heavily influenced by light.
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But for the moment, you're alert and powering through the rule of Julius Caesar.
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As the sun sets, your eyes send signals about the dwindling light to a part of your brain called suprachiasmatic nucleus.
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This is basically your circadian rhythm's clock.
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It alerts your pineal gland to start producing melatonin.
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That's the hormone that helps prepare your body for sleep,
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and levels start to rise about two hours before your normal bedtime.
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At the same time, neurons in the hypothalamus and brainstem release a compound called GABA.
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This slows down activity in your brain and can have a calming effect.
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You're approaching your normal bedtime.
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Since the brain needs to cool down before sleep,
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your core body temperature starts to drop.
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Huh, that map kind of looks like a face.
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Uh-oh, your attention has started to drift.
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Throughout the day, your brain has been releasing a waste product called adenosine.
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The more adenosine latching onto receptors in your brain,
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the more tired and inattentive you become.
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Time for a cup of coffee!
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Caffeine blocks adenosine from binding to receptors,
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which can give you a boost of energy.
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However, it might also make you jittery and increase your anxiety.
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You're acing these flashcards.
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Right now, these dates and names are being stored in an area of the brain called the hippocampus.
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Normally, when you go to sleep,
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memories like these are consolidated and slotted into long-term storage in your brain's neocortex.
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So it's a good thing you only need to remember this information through tomorrow.
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Micro sleeps are unpredictable periods of sleep that last for only a few seconds and are triggered by sleep deprivation.
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You stretch in an attempt to stay awake,
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but at this point your motor skills have also taken a hit.
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Studies have found that people who have been awake for 19 hours have similar coordination
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and reaction times as those who have been drinking.
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As the sun rises, your pineal gland stops releasing melatonin.
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You feel a second wind come on.
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And despite everything, you leave for school in a really good mood.
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Sleep deprivation can briefly induce euphoria.
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It's caused a temporary boost in dopamine levels,
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which can, unfortunately, also lead to poor choices.
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The final starts off well.
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It's all multiple choice.
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But then you get to the essay portion.
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It's thought that during sleep,
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our brains process ideas and draw connections between new memories and old ones.
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So your sleepless brain might be able to regurgitate facts,
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but you're finding it more difficult to find patterns or problem solve.
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You stare at the blank page, defeated.
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Get out!
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You head up to your room, anxious and irritable.
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Your amygdala, the part of the brain involved with processing emotion, is going haywire.
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Your prefrontal cortex usually keeps your amygdala in check,
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but it still isn't firing on all cylinders.
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Your bed has never felt so sweet.
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After one sleepless night, your body and brain bounce back pretty quickly.
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Which is a good thing,
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since we can't always control how much sleep we get.
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But going for long periods without a good night's sleep,
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or constantly changing your bedtime can take its toll.
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Regularly getting less than seven hours of sleep each night is
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linked to all sorts of health issues from diabetes to stroke to chronic pain.
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It also leaves you more vulnerable to developing mental health issues like depression.
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Your sleep schedule can even affect your grades.
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Studies have shown that college students who keep regular sleep hours have,
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on average, a higher GPA than students who don't.
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So the next time you're thinking of pulling an all-nighter,
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remember that Rome wasn't built in a day,
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or for that matter, one night.
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Clearly, physical rest can have a huge impact on your body and brain.
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But what about mental rest?
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Learn what happens to your mind when you let it wander with this video
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or explore the science of adolescence at ed.ted.com forward slash building dash connections.
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この動画で話す練習をする理由は？
この動画は、徹夜が脳に与える影響について話されています。学生が徹夜をする理由や、その結果どうなるのかを理解することで、日常生活や学習の中での睡眠の重要性について学ぶことができます。このような実生活に基づくコンテキストは、英語を使ってコミュニケーションを取るときに非常に役立ちます。YouTubeで英語学習をする際に、この動画を活用することで、言語の実用性と関連性を感じながら話すスキルを向上させることができます。
文法と表現の文脈
この動画には幾つかの重要な文法構造と表現があります。
- 「あなたがまだたくさんの勉強をしなければならない」 - 現在形を使った能力や必要性を表現する良い例です。
- 「あなたの脳がアデノシンという廃棄物を放出している」 - 現在進行形を使うことで、継続しているアクションを強調しています。
- 「あなたはコーヒーを飲む時です」 - この表現は日常的なコマンド（命令形）を使っています。
- 「睡眠不足は様々な健康問題と関連している」 - これは原因と結果を示す構文です。
これらの構造を通じて、英語の会話で使える実用的なフレーズを学ぶことができます。
一般的な発音の罠
この動画で取り上げられているいくつかのトリッキーな単語や発音があります。
- 「アデノシン（adenosine）」 - アクセントと正確な発音が難しいため、注意が必要です。
- 「メラトニン（melatonin）」 - 複雑な音の組み合わせがあり、スムーズに発音するためには練習が必要です。
- 「神経細胞（neurons）」 - 早口で言うとつまずきやすい単語です。
これらの言葉を効果的に発音する練習をすることで、IELTSスピーキング対策にも役立ちます。shadow speakを行うことで、リスニングや発音のスキルを向上させることができるでしょう。
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。