雅思阅读 062 — Why Doing Nothing Is Good for Your Brain

改编自 Scientific American / The Conversation（2026-09，Michael Craig, Northumbria University）。

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Reading Passage

You finish a lecture, a meeting, a conversation with someone you care about. And what do you do? You reach for your phone. You stick in your earbuds. You fire up a podcast, a playlist or whatever algorithmic feed is currently consuming your life.

It feels productive. It feels like filling empty time. But here is what may be happening: you have interrupted your brain mid-sentence.

When you learn something new — whether it is a colleague's name or the material covered in a morning lecture — your brain does not simply file it away neatly. The memory is fragile at first, more like wet cement than carved stone. In the minutes and hours following new learning, the brain works to strengthen what it has taken in. This is known as memory consolidation, the process through which newly formed memories become more stable.

Research suggests that quiet rest can help this process. Two recent meta-analyses, drawing on dozens of studies, found that people generally retained more information when learning was followed by several minutes of quiet rest rather than an absorbing task. One review found that the effect varied considerably between groups and was weaker in healthy younger adults. However, the overall advantage has been detected as long as seven days after learning.

One leading explanation is that quiet rest gives the brain fewer competing demands and more opportunity to reactivate a new experience, like an internal highlight reel reinforcing what has just been learned. Researchers have found that increased coordination between the hippocampus and areas of the cortex during post-learning rest is associated with better later memory.

The precise source of interference remains uncertain. One experiment found that engaging in a task after learning was more detrimental than resting, but that the task's attentional demands did not fully explain the difference.

Sleep isn't the whole story

Decades of research have established that sleep supports memory consolidation. But some researchers argue that sleep may form part of a broader process rather than acting as an entirely unique memory state.

The "opportunistic consolidation hypothesis" proposes that the brain takes advantage of periods with little new information or interference to stabilise what it has recently learned. These periods can include overnight sleep, shorter bouts of sleep and quiet wakeful rest.

In one experiment, participants completed memory tasks and then spent 30 minutes sleeping, resting with their eyes closed or performing a distracting task. Sleep and quiet rest produced similar memory benefits over this short interval, while both were more beneficial than the distracting task.

Doing nothing is harder than it sounds

Achieving genuine quiet rest can be difficult. The memory-consolidation window may be disrupted by internal mental activity as well as external stimulation.

In one series of experiments, participants who spent the rest period recalling past experiences or imagining future events retained less of the newly learned material than those who rested without being prompted to think autobiographically. Participants who reported the most vivid thoughts also tended to show greater disruption.

A recent study of adults without clinical anxiety adds a further complication. Moderate anxiety during quiet rest was associated with poorer memory consolidation, while lower and higher anxiety levels left new memories relatively intact. The study found only a modest overall advantage for rest, so the anxiety finding needs further investigation.

Exam pressure and a full inbox may therefore make effective rest harder to achieve.

What this means for real life

Quiet rest does not appear to require complete silence, closed eyes or a particular body position. A 2025 meta-analysis found that these factors did not significantly alter the average effect, although the evidence cannot yet tell us what the ideal real-world routine would look like.

For now, the practical implication is modest: after learning something you want to remember, consider leaving a brief gap before introducing more information. It might mean waiting a few minutes after a lecture before reaching for your phone. It could mean travelling home after an important conversation without immediately putting on a podcast. It might involve spending the space between two tasks looking out of a window.

These are the moments we increasingly fill with new input. If the emerging evidence is right, leaving some of them empty may give the brain a better chance to hold on to what just happened.

Questions

Questions 1–5: Do the following statements agree with the information?

Write TRUE / FALSE / NOT GIVEN.

1. Newly formed memories resemble wet cement rather than carved stone.
2. Meta-analyses show that quiet rest has no effect on memory retention.
3. The benefit of quiet rest was observed up to a week after learning.
4. The hippocampus and cortex work together more actively during post-learning rest.
5. Sleeping and quiet rest produced very different memory benefits in one 30-minute experiment.

Questions 6–10: Choose the correct letter, A, B, C or D.

6. The "opportunistic consolidation hypothesis" suggests that the brain

   • A. only consolidates memories during deep sleep
   • B. uses low-interference periods to stabilise recent learning
   • C. needs complete silence to consolidate memories
   • D. forgets memories that are not reviewed immediately

7. According to the passage, memory consolidation can be disrupted by

   • A. both external stimulation and internal mental activity
   • B. external stimulation only
   • C. internal mental activity only
   • D. neither of the above

8. Participants who recalled past experiences during rest tended to

   • A. perform better on memory tasks
   • B. show stronger memory consolidation
   • C. retain less of the newly learned material
   • D. fall asleep more quickly

9. The anxiety study found that

   • A. high anxiety always harms memory consolidation
   • B. moderate anxiety was associated with poorer consolidation
   • C. low anxiety had the strongest negative effect
   • D. anxiety had no effect on memory at all

10. The passage suggests that ideal quiet rest requires

    • A. a completely silent room
    • B. lying down with eyes closed
    • C. none of the above specifically
    • D. a dark environment

Questions 11–13: Complete the sentences. Choose NO MORE THAN TWO WORDS from the passage.

11. The process through which new memories become stable is called memory __________.
12. In a classroom study, children aged 10 to 12 showed better word retention after ten minutes of __________ rest.
13. The author recommends leaving a brief __________ after learning something you want to remember.

Answers

1. TRUE
2. FALSE (有积极效果)
3. TRUE
4. TRUE
5. FALSE (两者效果相似)
6. B
7. A
8. C
9. B
10. C
11. consolidation
12. quiet
13. gap

Glossary

• consolidation /kənˌsɒlɪˈdeɪʃn/ n. 巩固
• hippocampus /ˌhɪpəˈkæmpəs/ n. 海马体
• cortex /ˈkɔːteks/ n. 皮层
• meta-analysis /ˌmetə əˈnæləsɪs/ n. 元分析
• autobiographical /ˌɔːtəbaɪəˈɡræfɪkl/ adj. 自传式的
• vivid /ˈvɪvɪd/ adj. 生动的
• interference /ˌɪntəˈfɪərəns/ n. 干扰
• routine /ruːˈtiːn/ n. 惯例，常规