EigoPro 1級 読解 — The Industrious Brain Asleep: Why Rest Is Cognitive Labour

Popular wisdom casts sleep as a passive shutdown, a nightly intermission during which an exhausted brain merely recharges its depleted batteries and waits for dawn. Neuroscience tells a far more strenuous story. Far from idling, the sleeping brain orchestrates one of its most demanding operations: the consolidation of memory, whereby the fragile, easily disrupted traces laid down during waking hours are stabilised, reorganised, and quietly integrated into the vast archive of what we already know. The mechanism is now reasonably well understood. During slow-wave sleep, the hippocampus replays the neural sequences of recent experience, firing them again at compressed speed and relaying them to the neocortex for long-term storage. This is not idle rehearsal but a process of active triage. The replay is selective, privileging information the brain has tagged as salient while allowing the trivial to fade unmourned. Sleep, in other words, is an editor as much as an archivist, and forgetting is not a failure of the system but one of its most deliberate functions. This pruning is indispensable. A brain that retained everything indiscriminately would soon be paralysed by noise, unable to distinguish signal from clutter or yesterday's irrelevance from today's lesson. By weakening superfluous connections, sleep restores the capacity to learn afresh, clearing the synaptic ledger so that the following day's experiences can be inscribed without interference. What feels like mere rest is therefore intense cognitive labour, conducted in darkness and beyond the reach of consciousness. The practical corollary is sobering. To sacrifice sleep in the name of productivity is to dismantle the very process by which the day's effort is rendered permanent and retrievable. The student who crams through the night, the executive who treats six hours as a badge of discipline, both unwittingly discard the dividend of their exertions, surrendering the gains they laboured to make. Rest, properly understood, is not the antithesis of work but its quiet, necessary completion.

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この単元の問題を3問、解説つきで公開しています

1級 · 読解 · 全5問

問 1

Which statement best captures the central argument of the passage?

  • Sleep is an active cognitive process that consolidates and prunes memory, making it integral to learning rather than mere recovery.
  • Forgetting during sleep is an unavoidable malfunction that good sleep hygiene can help minimise.
  • The hippocampus and neocortex compete for control of memory, and sleep resolves the conflict between them.
  • Sleep is primarily a period of physical recharging during which the brain conserves energy for the following day.
Phrase

What feels like mere rest is therefore intense cognitive labour

1級読解主旨把握論旨
⚡ひとことで

睡眠は受動的な休息ではなく、記憶を整理・選別する能動的な認知労働であるという主張が全体を貫いている。

選択肢の解説Choice Analysis

「Sleep is an active cognitive process that consolidates and prunes memory, making it integral to learning rather than mere recovery.」

正解

本文は冒頭で「passive shutdown」という通俗的理解を退け、睡眠を「one of its most demanding operations」と位置づける。記憶の consolidation と pruning を通じて学習を支える能動的プロセスである点が一貫した主旨であり、「What feels like mere rest is therefore intense cognitive labour」がそれを端的に示す。よってこの選択肢が中心的主張を最もよく捉えている。

  • 「Sleep is primarily a period of physical recharging during which the brain conserves energy for the following day.」

    = 睡眠は身体的な充電期間でエネルギーを蓄える時間だとする説 ━ 本文はまさにこの「passive shutdown / merely recharges」という通俗的見方を否定して始まるため、主旨と正反対である。。

  • 「The hippocampus and neocortex compete for control of memory, and sleep resolves the conflict between them.」

    = 海馬と新皮質が記憶の支配権を争い睡眠が調停するという説 ━ 本文では海馬が新皮質へ情報を relay する協働関係が描かれており、両者の争いという記述は存在しない。。

  • 「Forgetting during sleep is an unavoidable malfunction that good sleep hygiene can help minimise.」

    = 睡眠中の忘却は防ぐべき不具合だとする説 ━ 本文は forgetting を「not a failure of the system but one of its deliberate functions」と明言しており、欠陥ではなく意図的機能とする。。

▦Collocation
パターン意味例
consolidation of memory記憶の固定化Sleep drives the consolidation of memory after learning.
far from idling休んでいるどころかFar from idling, the brain stays remarkably busy at night.
integrate into～に統合するNew facts are integrated into existing knowledge during sleep.
a failure of the systemシステムの不具合Forgetting is not a failure of the system but a feature.
beyond the reach of consciousness意識の及ばないところでThis editing happens beyond the reach of consciousness.
❝例文

  • The brain consolidates the day's experiences while we sleep.

    脳は眠っている間に一日の経験を固定化する。

  • She argued that rest is labour, not idleness.

    彼女は休息とは怠惰ではなく労働だと論じた。

  • Cramming all night undermines lasting memory.

    徹夜の詰め込みは長期記憶を損なう。

  • Selective replay privileges what matters most.

    選択的な再生は最も重要なものを優先する。

💡Tip · 覚えるコツ

GIST 問題では冒頭で否定される通俗説（ここでは「充電・受動的停止」）を正解と取り違えやすい。筆者が反論として立てる主張こそが主旨である。

問 2

According to the passage, what occurs in the hippocampus during slow-wave sleep?

  • It pauses its activity to allow the neocortex to recharge in isolation.
  • It generates entirely new memories that were not formed during the preceding waking hours.
  • It transfers all incoming sensory data to the neocortex without any selection or filtering.
  • It replays recent neural sequences at compressed speed and relays them to the neocortex for long-term storage.
Phrase

firing them again at compressed speed and relaying them to the neocortex

1級読解詳細把握
⚡ひとことで

徐波睡眠中、海馬は最近の経験の神経系列を圧縮速度で再生し、新皮質へ中継して長期保存に回す。

選択肢の解説Choice Analysis

「It replays recent neural sequences at compressed speed and relays them to the neocortex for long-term storage.」

正解

本文は「the hippocampus replays the neural sequences of recent experience, firing them again at compressed speed and relaying them to the neocortex for long-term storage」と述べる。再生は最近の経験についてであり、圧縮速度で行われ、新皮質へ中継される。よってこの選択肢が記述と一致する。

  • 「It generates entirely new memories that were not formed during the preceding waking hours.」

    = 覚醒時に形成されなかった全く新しい記憶を作るとする説 ━ 本文の再生対象は「recent experience」であり、新たに作るのではなく既存の痕跡を扱う。。

  • 「It transfers all incoming sensory data to the neocortex without any selection or filtering at all.」

    = 入力された感覚情報をすべて無選別で新皮質へ送るとする説 ━ 本文は再生が「selective」で salient な情報を優先すると明記し、無選別ではない。。

  • 「It pauses its activity to allow the neocortex to recharge in isolation.」

    = 海馬が活動を止め新皮質を単独で充電させるとする説 ━ 本文では海馬が能動的に replay・relay しており、休止するという記述はない。。

▦Collocation
パターン意味例
replay the neural sequences神経系列を再生するDuring sleep the brain replays the neural sequences of the day.
at compressed speed圧縮された速度でMemories are rerun at compressed speed overnight.
relay to～へ中継するSignals are relayed to the neocortex for storage.
long-term storage長期保存Information moves into long-term storage as we sleep.
recent experience最近の経験Sleep stabilises traces of recent experience.
❝例文

  • The hippocampus replays the day's routes while a rat sleeps.

    ラットが眠る間、海馬はその日の経路を再生する。

  • Compressed replay speeds the transfer to the cortex.

    圧縮再生は皮質への転送を速める。

  • Slow

    wave sleep favours this kind of consolidation. — 徐波睡眠はこの種の固定化を促す。

  • The neocortex serves as the brain's long

    term archive. — 新皮質は脳の長期保管庫として機能する。

💡Tip · 覚えるコツ

DETAIL 問題は本文の動詞をそのまま追う。「replays … at compressed speed … relaying … to the neocortex」の三要素を満たす選択肢を選ぶ。

問 3

Why does the passage describe pruning during sleep as 'indispensable'?

  • Because weakening superfluous connections clears the brain so that new experiences can be learned without interference.
  • Because it strengthens every connection equally to maximise total storage capacity.
  • Because it speeds up the heartbeat and other bodily functions during deep sleep.
  • Because it permanently erases traumatic memories that would otherwise disturb the sleeper.
Phrase

clearing the synaptic ledger so that the following day's experiences can be inscribed without interference

1級読解詳細把握
⚡ひとことで

不要な結合を弱めてシナプスの帳簿を整理し、翌日の経験を干渉なく刻めるようにするため不可欠とされる。

選択肢の解説Choice Analysis

「Because weakening superfluous connections clears the brain so that new experiences can be learned without interference.」

正解

本文は「By weakening superfluous connections, sleep restores the capacity to learn afresh, clearing the synaptic ledger so that the following day's experiences can be inscribed without interference」と述べる。剪定は余分な結合を弱め、翌日の学習の余地を作る点で不可欠だとされる。よってこの選択肢が理由を正しく説明する。

  • 「Because it permanently erases the traumatic memories that would otherwise disturb the sleeper's rest.」

    = 睡眠を妨げる外傷記憶を恒久的に消すからとする説 ━ 本文に外傷記憶への言及はなく、剪定の目的は再学習能力の回復である。。

  • 「Because it strengthens every connection equally to maximise total storage capacity.」

    = 全結合を等しく強化し総容量を最大化するからとする説 ━ 本文は不要な結合を「weakening」すると述べ、無差別な強化とは正反対である。。

  • 「Because it speeds up the heartbeat and other bodily functions during deep sleep.」

    = 深い睡眠中に心拍など身体機能を速めるからとする説 ━ 本文は剪定を認知的機能として論じており、心拍などの身体機能には触れていない。。

▦Collocation
パターン意味例
weaken superfluous connections余分な結合を弱めるSleep weakens superfluous connections built up by day.
learn afresh新たに学習するA pruned brain can learn afresh each morning.
distinguish signal from clutter信号を雑音から区別するPruning lets us distinguish signal from clutter.
without interference干渉なしにNew facts are encoded without interference after sleep.
restore the capacity to～する能力を回復させるRest restores the capacity to absorb new material.
❝例文

  • A brain that kept everything would drown in noise.

    すべてを保持する脳は雑音に溺れてしまう。

  • Pruning makes room for tomorrow's lessons.

    剪定は明日の学びの余地を作る。

  • The synaptic ledger is cleared each night.

    シナプスの帳簿は毎晩整理される。

  • Forgetting the trivial sharpens the essential.

    些末なものを忘れることが本質を際立たせる。

💡Tip · 覚えるコツ

原因・理由を問う DETAIL では結果（learn afresh）ではなく機構（weakening superfluous connections）まで含む選択肢を選ぶと安全。

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