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Why Our Pupils Get Larger When We Are Surprised (Level A1) — a close up of a human brain on a black background

Why Our Pupils Get Larger When We Are SurprisedCEFR A1

21 Aug 2026

LevelA1
A2
B1
B2

Adapted from Brown University, Futurity • CC BY 4.0

Photo by Shawn Day, Unsplash

Level A1 – Beginner
1 min
54 words
  • New research explains why pupils grow larger.
  • This happens when people see unexpected things.
  • Our bodies have a natural physical response.
  • A study looks at brain waves and eyes.
  • Researchers work with many different people.
  • Participants look at colored squares on screens.
  • Surprising colors change pupil size.
  • The brain learns faster from new information.

Difficult words

  • pupil — The dark part in the center of the eye.
    pupils
  • unexpected — Something that happens without you knowing before.
  • researcher — A person who studies things to find new facts.
    Researchers
  • participant — A person who takes part in a study.
    Participants

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • What color do you like to look at on a screen?
  • Do you like to learn new things every day?

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