シャドーイング練習: What is Narcolepsy? - 動画で英語スピーキングを学ぶ
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And how to kind of try to describe it to them.
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I found over time it's really difficult for people to understand it.
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It's just very complicated with this tiredness, the cataplexy, the fragmented sleep at night.
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If you're a normal person, you've got sleep and you've got your waking life.
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And occasionally they'll overlap a little bit.
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For me, I live in this world that is very rarely am I fully awake and very rarely am I fully asleep.
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I live in the in-between.
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I'm Tom Scanlon.
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I'm a professor of neurology at Harvard Medical School.
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Narcolepsy is a neurologic disorder.
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It is one of the most common sleep disorders.
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It affects about one in two thousand people.
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It doesn't matter how much sleep they get at night, they're going to feel sleepy every day.
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People also can have a variety of other symptoms.
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These include hypnagogic hallucinations, where they can have very vivid dreamlike hallucinations just as they're drifting off to sleep
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or just when they awaken.
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They can have something called sleep paralysis, where as they're falling asleep or sometimes when they wake up, they can't move.
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And then there's cataplexy, which is similar to sleep paralysis.
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The distinction is that cataplexy occurs right in the middle of the day, and it's triggered by strong emotions.
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And then the last thing, which is perhaps sort of one of the strangest of all,
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is that, considering that somebody with narcolepsy is often very sleepy through the day, they often have fragmented sleep at night.
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They can wake up four or five times for 10 or 20 minutes for no clear reason.
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And so in the same way that they have trouble maintaining wakefulness through the day, they they can have trouble maintaining sleep through the night.
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Somewhere between age 10 and age 20 or so is when narcolepsy begins.
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People usually start off with sleepiness and then the other symptoms follow.
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So there's a number of different systems in the brain that are involved in promoting arousal or wakefulness and sleep.
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Up here is the cortex.
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This is the front near the forehead.
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Here's the back.
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This is the brainstem coming down here.
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And this is the cerebellum, which is involved in balance.
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The brainstem is the site that most of these arousal promoting signals come from.
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And those cells send connections up throughout the whole front part of the brain,
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and they help turn on the cortex and other parts of the brain when you're awake.
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There's also some cells in a small region called the hypothalamus
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that are involved in promoting sleep
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and these sleep promoting cells one of the things they do is they actually turn off the wake promoting cells
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and so that allows you to be fully asleep without any hint of consciousness.
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This is called the mammillary body and just above it right here is where the hypocretin neurons sit.
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And this is a really critical collection of neurons,
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brain cells, that makes very particular and special neurotransmitters known as hypocretin or orexin.
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Those are just two names for the same thing.
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The hypocretin producing cells help activate and sustain activity in the other weight promoting brain regions across the day.
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The brain contains billions of neurons and And only a very, very small number of these produce hypocretin.
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It's probably somewhere between 100,000 and 200,000, which sounds like a large number, but when you compare it to 10 billion neurons, it's really very small.
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In narcolepsy, those hypocretin-producing cells die off.
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When you look closely at the brain of somebody who has narcolepsy, what you see is about a 90 to 95% loss of the hypocretin-producing neurons.
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So there's two broad themes that are being pursued in narcolepsy research right now.
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One theme is to understand what goes wrong in the brain when the hypocretin-producing cells die off.
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How does that lead to sleepiness and cataplexing and other symptoms?
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Another big theme is trying to understand what actually kills the hypocretin neurons in the first place.
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Because if we could understand that, then it's possible that if one could diagnose and recognize narcolepsy right at the earliest stages,
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we might be able to get in and stop that process.
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As we've discovered more and more about what's actually causing the hypocretin neurons to die off,
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and as we've discovered more about the consequences of that for the brain,
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it's really given us a lot of hope for new opportunities for coming up with better therapies for people with narcolepsy.
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If we could get hypocretin back in the brain somehow, that would be potentially as great is giving insulin to people with diabetes.
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It would really be the missing factor coming back into play.
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And it could, in theory, cure their sleepiness and cure their cataplexy in the most thorough fashion.
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Right now, scientists are working with a variety of techniques to try to get hypocretin signaling back into the brain.
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But the hope is that in 5, 10, or 15 years, we may see those hypocretin replacement therapies coming into clinical practice.
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このレッスンの語彙とスピーキングのポイント
このスピーキングレッスンは、動画「What is Narcolepsy?」を教材にしています。 繰り返し出てくる語は次のとおりです：hypocretin, sleep, brain, narcolepsy, cells。 この動画には、シャドーイング用の文が61文、単語が843語あります。 音声の長さは4:59です。 話す速さは1分あたり約169語で、日常会話に近い自然なペースです。 単語の83%は英語の頻出3,000語に含まれます。残りは練習の前に確認しておきましょう。
この動画の重要語彙
動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。
| 単語 | 発音 | 意味 |
|---|---|---|
| asleep 形容詞 | /əˈsliːp/ | 寝ている, 眠っている |
| symptom 名詞 | /ˈsɪm(p)təm/ | 症状, 症候 |
| rarely 副詞 | /ˈɹɛəɹli/ | 滅多に…ない, 稀に |
| discover 動詞 | /dɪˈskʌvə/ | 発見する, 見つける |
| cure 動詞 | /kjɔː/ | 治す, 癒す |
| disorder 名詞 | /dɪsˈɔɹdɚ/ | 混乱 |
| awake 動詞 | /əˈweɪk/ | 目覚める, 目を覚ます |
| sleepy 形容詞 | /ˈsliːpi/ | 眠い, 眠たい |
| fragment 名詞 | /ˈfɹæɡmənt/ | 断片, 破片 |
| complicated 形容詞 | /ˈkɑm.plɪˌkeɪ.tɪd/ | 複雑な |
| occur 動詞 | /əˈkɜː/ | 起こる, 起る |
| technique 名詞 | /tɛkˈniːk/ | 技術 |
| compare 動詞 | /kəmˈpɛɚ/ | 比べる, 比較する |
| replacement 名詞 | /ɹɪˈpleɪsmənt/ | 代替 |
| occasionally 副詞 | /əˈkeɪʒənəli/ | たまに, 偶に |
動画に出てくる句動詞
| 単語 | 発音 | 意味 |
|---|---|---|
| wake up 動詞 | /ˌweɪk ˈʌp/ | 目覚める, 目を覚ます |
| come down 動詞 | 降りる | |
| turn off 動詞 | 消す, 切る |
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 | are involved · is involved · is called |
| 関係詞節 who / which + 節 — 人や物について情報を加える | cataplexy, which is · thing, which is · cerebellum, which is |
| 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 | have fragmented · we've discovered |
注意したい発音
話し手はthey're, I'm, we'veなど、短縮形や弱形を14回使っています。聞こえたとおりの短い形で発音しましょう。
- 「sh」と「zh」の音: occasionally /əˈkeɪʒənəli/, potentially /pəˈtɛnʃ(ə)li/, emotion /ɪˈməʊ.ʃən/, consciousness /ˈkɑnʃəsnəs/, distinction /dɪˈstɪŋkʃən/
- 長い単語（アクセントの位置に注意）: complicated /ˈkɑm.plɪˌkeɪ.tɪd/, occasionally /əˈkeɪʒənəli/, potentially /pəˈtɛnʃ(ə)li/, neurological /nɝəˈlɑd͡ʒɪkəl/, hypocretin /ˌhaɪ.poʊˈkɹiː.tən/
日本語話者が苦手な音：
- /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: rarely /ˈɹɛəɹli/, replacement /ɹɪˈpleɪsmənt/, narcolepsy /ˈnɑː(ɹ)kəˌlɛpsi/, arousal /əˈɹaʊzəl/, paralysis /pəˈɹæləsəs/
- /v/ — /b/ にならないように、上の歯を下唇に当てる: discover /dɪˈskʌvə/, activate /ˈæktɪˌveɪt/, vivid /ˈvɪvɪd/, overlap /ˌəʊvəˈlæp/
- /f/ — 「フ」ではなく、上の歯と下唇で出す: fragment /ˈfɹæɡmənt/, forehead /ˈfɔɹ.hɛd/, drift /dɹɪft/, wakefulness /ˈweɪk.fʊl.nəs/
この動画での練習方法
- まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
- まず0.75倍速で一文ずつシャドーイングし、慣れてきたら通常の速度に戻します。
- 自分の声を録音して元の音声と比べます。asleep, symptom, rarelyなどの単語に特に注意しましょう。
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。