Difference in pupil size correlates to higher level of intelligence
It has been said that “the eyes are the window to the soul,” but new research suggests that they may be a window to the brain as well.
There is a surprising correlation between baseline pupil size and several measures of cognitive ability
Our pupils respond to more than just the light. They indicate arousal, interest, or mental exhaustion. Pupil dilation is even used by the FBI to detect deception. Now work conducted in the Georgia Institute of Technology laboratory suggests that baseline pupil size is closely related to individual differences in intelligence. The larger the pupils, the higher the intelligence, as measured by tests of reasoning, attention, and memory. In fact, across various studies, it’s found that the difference in baseline pupil size between people who scored the highest on the cognitive tests and those who scored the lowest was large enough to be detected by the unaided eye.
This surprising relationship was first uncovered while studying differences in the amount of mental effort people used to complete memory tasks. Pupil dilations were used as an indicator of effort, a technique psychologist Daniel Kahneman popularized in the 1960s and 1970s.
Several large-scale studies have been performed in which participants’ pupil size was measured using an eye tracker, a device that captures the reflection of light off the pupil and cornea using a high-powered camera and computer, at rest, while they stared at a blank computer screen for up to four minutes. All the while, the eye tracker was recording. Using the tracker, then calculated each participant’s average pupil size.
Pupil size refers to the diameter of the black circular aperture in the center of the eye. It can range from around two to eight millimeters. The pupil is surrounded by the colorful area known as the iris, which is responsible for controlling the size of the pupil. Pupils constrict in response to bright light, among other things, so the laboratory was kept dim for all participants.
In the next part of the experiment, participants completed a series of cognitive tests designed to measure “fluid intelligence,” the capacity to reason through new problems, “working memory capacity,” the ability to remember information over a period of time, and “attention control,” the ability to focus attention amid distractions and interference.
As one example of an attention control test, participants had to resist glancing toward a bold, flickering asterisk on one side of a computer screen and instead rapidly look in the opposite direction to identify a letter. The letter would disappear within moments, so even a brief eye movement toward the flickering asterisk could result in missing it. Humans are primed to react to objects passing through their peripheral vision — it’s what once allowed us to spot a predator or prey — but this task required participants to redirect their focus from the flicking asterisk to the letter.
It was found that a larger baseline pupil size was correlated with greater fluid intelligence, attention control, and, to a lesser degree, working memory capacity — indicating a fascinating relationship between the brain and eye. Interestingly, pupil size was negatively correlated with age: older participants tended to have smaller, more constricted, pupils. Once standardized for age, however, the relationship between pupil size and cognitive ability remained.
But why does pupil size correlate with intelligence? To answer this question, we need to understand what is going on in the brain. Pupil size is related to activity in the locus coeruleus, a nucleus situated in the upper brain stem with far-reaching neural connections to the rest of the brain. The locus coeruleus releases norepinephrine, which functions as both a neurotransmitter and hormone in the brain and body, and it regulates processes such as perception, attention, learning, and memory. It also helps maintain a healthy organization of brain activity so that distant brain regions can work together to accomplish challenging tasks and goals. Dysfunction of the locus coeruleus, and the resulting breakdown of organized brain activity, have been related to several conditions, including Alzheimer’s disease and attention deficit hyperactivity disorder. This organization of activity is so important that the brain devotes most of its energy to maintain it, even when we are not doing anything at all — such as when we stare at a blank computer screen for minutes on end.
One hypothesis is that people who have larger pupils at rest have greater regulation of activity by the locus coeruleus, which benefits cognitive performance and resting-state brain function. Additional research is needed to explore this possibility and determine why larger pupils are associated with higher fluid intelligence and attention control. But there is more happening than meets the eye.