EigoPro 準1級 読解 — The Bilingual Brain

For decades, raising a child with two languages was viewed with suspicion. Educators warned that a divided linguistic diet would confuse young minds and stunt their command of either tongue. That folk wisdom has now been overturned. A growing body of neuroscience suggests that juggling two languages does not muddle the brain so much as exercise it, leaving a measurable imprint on the very architecture of thought. The crux of the matter lies in a faculty psychologists call executive control—the mental machinery that lets us focus on what is relevant and suppress what is not. A bilingual brain, it turns out, never truly switches one language off. Both remain quietly active, even when only one is being spoken, so the speaker must constantly inhibit the intruding tongue. This perpetual act of selection, repeated countless times a day, appears to sharpen the same neural circuits we rely on to ignore distractions, switch between tasks, and hold competing options in mind. In effect, conversation becomes a covert workout for the brain's control system. The dividends seem to accumulate over a lifetime. Some studies report that lifelong bilinguals show the clinical symptoms of dementia several years later than their monolingual peers, even when the underlying brain damage is comparable—as though a second language builds a kind of cognitive reserve, a buffer that lets the mind compensate for deterioration. Yet caution is warranted. Several of the early findings have proved difficult to reproduce, and skeptics argue that factors such as education, immigration, and social class may be doing the work that researchers have attributed to language alone. What is no longer in dispute is the central reversal: a second language is not a burden the brain must bear, but a habit that may quietly fortify it.

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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

準1級 · 読解 · 全5問

問 1

What is the main idea of the passage?

  • Bilingual children inevitably fall behind monolingual children in mastering either language.
  • Neuroscience has now conclusively proven that bilingualism prevents dementia.
  • Far from harming the mind, managing two languages appears to strengthen the brain's control systems and may protect it over a lifetime.
  • Educators were right to warn that two languages confuse a developing child.
Phrase

juggling two languages does not muddle the brain so much as exercise it

準1級読解神経科学言語学主旨把握
⚡ひとことで

本文全体は「二言語の運用は脳を混乱させるどころか鍛え、生涯にわたり守りうる」という論旨。

選択肢の解説Choice Analysis

「Far from harming the mind, managing two languages appears to strengthen the brain's control systems and may protect it over a lifetime.」

正解

本文は (1) かつての『二言語は子供を混乱させる』通念が覆った→ (2) 二言語の抑制が executive control を鍛える仕組み→ (3) 生涯にわたる cognitive reserve の可能性 (ただし慎重論あり) という構成。最終段の a second language is not a burden ... but a habit that may quietly fortify it が結論。よって「害するどころか脳の制御系を強化し、生涯にわたり守りうる」が主旨。

  • 「Bilingual children everywhere inevitably fall behind the monolingual children in mastering either of their languages.」

    = 二言語児は必ず遅れる ━ 本文冒頭はこの旧通念を『今や覆った (overturned)』と否定しているので逆。

  • 「Modern neuroscience has by now conclusively proven that bilingualism entirely prevents the later onset of dementia.」

    = 認知症予防が決定的に証明された ━ 本文は早期の知見が『再現困難 (difficult to reproduce)』で慎重論ありと明言しており conclusively ではない。

  • 「The educators of the past were quite right to warn that learning two languages will confuse any developing child.」

    = 教育者の警告は正しかった ━ 本文は教育者の警告を『folk wisdom が覆った』と退けているので正反対。

▦Collocation
パターン意味例
be viewed with suspicion疑いの目で見られるBilingualism was viewed with suspicion.
be overturned覆されるThat folk wisdom has been overturned.
a growing body of ~増えつつある~a growing body of neuroscience
leave an imprint on ~~に痕跡を残すIt leaves an imprint on thought.
not A so much as BAというよりむしろBnot muddle so much as exercise
❝例文

  • A growing body of evidence supports the claim.

    それを支持する証拠が増えつつある。

  • The old folk wisdom has been overturned.

    その古い通念は覆された。

  • Stress does not weaken him so much as motivate him.

    ストレスは彼を弱めるというよりむしろ奮い立たせる。

💡Tip · 覚えるコツ

主旨設問は最終段の対比結論文 (not A but B) を探すと速い。冒頭の旧通念は『覆された』ものとして提示される導入装置で、主旨ではない。

問 2

According to the passage, why might bilingualism strengthen executive control?

  • Because bilinguals deliberately shut down one language entirely while speaking the other.
  • Because bilinguals are taught formal techniques for switching between tasks at school.
  • Because both languages stay active, the speaker must repeatedly suppress the unwanted one, exercising the circuits used to ignore distractions.
  • Because speaking two languages physically enlarges the regions of the brain devoted to hearing.
Phrase

Both remain quietly active ... so the speaker must constantly inhibit the intruding tongue

準1級読解神経科学言語学詳細把握
⚡ひとことで

両言語が常に活性化→使わない方を絶えず抑制→注意の制御回路が鍛えられる。

選択肢の解説Choice Analysis

「Because both languages stay active, the speaker must repeatedly suppress the unwanted one, exercising the circuits used to ignore distractions.」

正解

第2段は『二言語脳は片方を完全には切らない (never truly switches one language off)』『両方が静かに活性化したまま (Both remain quietly active)』『割り込む言語を絶えず抑制 (constantly inhibit the intruding tongue)』と述べ、これが distractions を無視する神経回路を sharpen すると説く。これを言い換えた選択肢が正解。

  • 「Because bilingual speakers deliberately shut down the one language completely while they happen to be speaking the other one.」

    = 片方を完全に切る ━ 本文は『決して完全には切らない (never truly switches off)』と明言しており正反対。

  • 「Because speaking two languages physically enlarges each and every one of the regions of the brain that are devoted to hearing.」

    = 聴覚領域を物理的に拡大 ━ 本文は executive control の回路の話で、聴覚領域の拡大は述べていない。

  • 「Because bilingual speakers are all taught a set of formal techniques for switching between different tasks while at school.」

    = 学校で公式手法を習う ━ 本文の鍛錬は会話中の無意識の抑制であり、学校での明示的指導ではない。

▦Collocation
パターン意味例
switch ~ off~を切るnever switches a language off
inhibit ~~を抑制するinhibit the intruding tongue
rely on ~ to V~に頼って…するcircuits we rely on to ignore distractions
hold ~ in mind~を念頭に保つhold competing options in mind
a covert workout for ~~の隠れた鍛錬a covert workout for the brain
❝例文

  • He had to inhibit the urge to interrupt.

    彼は割り込みたい衝動を抑えねばならなかった。

  • We rely on these circuits to ignore distractions.

    我々はこの回路に頼って雑念を無視する。

  • She held several options in mind at once.

    彼女は複数の選択肢を同時に念頭に保った。

💡Tip · 覚えるコツ

因果の詳細設問は本文の核となる動詞 (inhibit, suppress) と『どの能力が鍛えられるか (ignore distractions)』のペアを照合する。正反対肢 (shut down entirely) は本文の never で即除外。

問 3

What does the passage say about the link between bilingualism and dementia?

  • Bilingualism has been shown to fully reverse the brain damage that causes dementia.
  • Some studies suggest lifelong bilinguals show dementia symptoms years later than monolinguals with comparable brain damage.
  • Monolinguals and bilinguals show identical dementia symptoms at the same age.
  • Bilinguals develop more underlying brain damage but report fewer symptoms of it.
Phrase

bilinguals show the clinical symptoms of dementia several years later ... even when the underlying brain damage is comparable

準1級読解神経科学言語学詳細把握
⚡ひとことで

脳損傷が同等でも、生涯二言語話者は認知症の症状が数年遅れて現れるという研究がある。

選択肢の解説Choice Analysis

「Some studies suggest lifelong bilinguals show dementia symptoms years later than monolinguals with comparable brain damage.」

正解

第3段は『一部の研究 (Some studies report)』が、脳損傷が同程度 (the underlying brain damage is comparable) でも、生涯二言語話者は単一言語話者より認知症の臨床症状が数年遅れて現れると報告すると述べ、これを cognitive reserve (認知の予備力) と説明する。この内容に一致する選択肢が正解。

  • 「Bilingualism has now been shown to reverse entirely all of the brain damage that gives rise to dementia.」

    = 脳損傷を完全に逆転 ━ 本文は損傷を『補償する (compensate for)』であって逆転とは言っていない。

  • 「Bilingual speakers develop a great deal more underlying brain damage but they report fewer symptoms of it.」

    = より多くの脳損傷を生じる ━ 本文は損傷が『同等 (comparable)』とする。多いとは述べていない。

  • 「Monolinguals and bilinguals alike both show entirely identical dementia symptoms at exactly the same age.」

    = 同年齢で同一の症状 ━ 本文は二言語話者の方が症状が遅いとしており identical ではない。

▦Collocation
パターン意味例
show symptoms of ~~の症状を示すshow symptoms of dementia
compensate for ~~を補うcompensate for deterioration
a buffer against ~~に対する緩衝a buffer against decline
comparable to ~~に匹敵するdamage comparable to theirs
build a reserve予備力を蓄えるbuild a cognitive reserve
❝例文

  • A second language may build a cognitive reserve.

    第二言語は認知の予備力を築くかもしれない。

  • The reserve lets the mind compensate for damage.

    その予備力で心は損傷を補える。

  • Their symptoms appeared several years later.

    彼らの症状は数年遅れて現れた。

💡Tip · 覚えるコツ

数値・比較の詳細設問は『同等 (comparable) なのに結果が違う』という対比に注目。compensate (補う) を reverse (逆転) にすり替える言い過ぎ肢が定番の罠。

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