The latest research suggests that there is an amazing correlation between the pupil size of the eye and some cognitive abilities. The pupil is one of the most valuable sensory organs in the human body. It senses the light and gives us the visual stimulus. But they are not only responding to the light. They indicate some other like arousal, interest, or mental exhaustion.


The latest research done at the Georgia Institute of Technology suggests that pupil size is closely related to the intelligence of the person. According to their research they found, the larger the pupils, the higher the intelligence.

They used three tests to do the research. Those were to check the ability of

  • Reasoning
  • Attention
  • Memory

Scientists found that the people who scored highest at all three tests and the people who scored lowest in the tests have a calculatable difference in their baseline pupil size of the eyes.

How the research was done

This research came up while studying the differences in the amount of mental effort people use to complete tasks that require high memory power. They found that there is some relation between pupil size and intelligence but they were not sure about that.


Then they started large-scale research on this. More than 500 people from age 18 to 35 were used in this research. A device called an eye tracker was used to measure the pupil size of the participants. Eye tracker uses the light-reflection difference between the pupil and the cornea to measure pupil size.

As you know, pupil size changed according to the outside factors. Therefore all the people have given time to rest their eyes. All the conditions in the lab were kept constant throughout the research. Various tests were done to measure the intelligence of the people.

Why this happens? What is the Reason?

The exact reason for this is not yet confirmed. There is one hypothesis that suggests some ways that could happen. That is the people who have larger pupils have a great regulation in the brain center, that is responsible for cognitive performances.

Soon we could hear another research based on this and we could hear the exact reason for this.

Feature Image by Alexandru Zdrobău on Unsplash

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