How blinking reveals you've got a well-behaved toddler: study

Key Points:

• Researchers found that higher spontaneous eye-blink rates (sEBR) in children aged 3-6 correlate with better performance on cognitive flexibility tasks, such as a card-sorting game requiring rule-switching.
• The link between blinking and cognitive flexibility is associated with increased activation in the right dorsolateral prefrontal cortex (dIPFC), a brain region responsible for executive functions like planning and focus.
• Using functional near-infrared spectroscopy (fNIRS) and video recording, scientists observed that spontaneous blinking occurs simultaneously with heightened dIPFC activity, suggesting sEBR reflects dopamine-related brain function.
• Older preschool children showed more pronounced blinking variations and more specialized dIPFC activation, indicating that higher blink rates may signal healthier brain network specialization and better impulse control.
• While blinking is a promising, noninvasive marker for tracking brain development in young children, researchers caution it should complement rather than replace traditional brain scans and behavioral assessments.