A study in Japan suggests that higher spontaneous blink rates in young children may serve as a low-cost indicator of developing executive functions, linked to activity in the prefrontal cortex during rule-switching tasks.
Scientists in Japan have identified a possible window into how executive function takes shape in early childhood, finding that a child’s spontaneous blink rate appears to track both performance on a rule-switching task and activity in a key part of the prefrontal cortex.
In a study published in Communications Psychology, researchers from the University of Tsukuba and Kyoto University examined 113 children aged three to six while they played a card-sorting game that required them to change rules mid-task, such as shifting from sorting by colour to sorting by shape. The team used video recordings to measure spontaneous eye blinks and functional near-infrared spectroscopy, or fNIRS, to monitor brain activity without invasive procedures.
Children who blinked more often tended to do better when the task demanded flexibility, even after age was taken into account. The same higher blink rate was linked specifically to stronger activation in the right dorsolateral prefrontal cortex, a region associated with cognitive flexibility, while the effect did not extend to the other prefrontal areas measured. The researchers also found that older children showed more focused activity in that region, suggesting that blink rate may rise alongside the brain’s growing specialisation for executive tasks.
The finding adds to a broader body of work showing that the prefrontal cortex becomes more active and more finely tuned as children develop skills such as inhibition, working memory and flexible thinking. Earlier fNIRS studies have reported age-related increases in prefrontal activation during executive tasks, and separate research has shown that simple physical activity can alter blood flow in the same brain region. The new work suggests that spontaneous blinking, which can be captured on ordinary video, may offer a practical, low-cost way to follow executive function development in young children.
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