Blink and you’ll miss it, right? Not so fast. A new study suggests blinking actually helps us process information and gives our brains a quick break. And here’s the coolest part: Turns out our brains might be doing a lot more behind the scenes than previously thought.
If we didn’t blink, our eyes would get pretty dry. But humans blink a lot more than is required for keeping our eyes moist (on average 15-20 times a minute, even though we only “need” 2-4 a minute). Scientists at Japan’s Osaka University wanted to see if all that blinking had a hidden purpose, so they asked 20 undergraduates to watch an episode of the British television show “Mr. Bean” while their blinks and brain activity were recorded in an MRI machineBlink- related momentary activation of the default mode network while viewing videos. Nakano, T., Kato, M., Morito, Y. et al. Dynamic Brain Network Laboratory, Graduate School of Frontier Biosciences, Osaka University. Procedural of the National Academy of Sciences. 2012 Dec 24. [Epub ahead of print]. As predicted, the students tended to blink whenever there was an “implicit stop” on screen, like when a character exits a room or when a scene change occurs. But that’s not all.
Blinking actually triggered a momentary shift in brain activity from an area that helps us focus attention (the dorsal attention network) to an area responsible for subconscious processing (the default-mode network). Once the eyes opened again, brain activity shifted back. In a way, blinking seemed to help the students process what they saw.
The researchers then tested whether blinking itself or just the brief lack of visual stimuli triggered the switch. In a second study they inserted short, blink-length intervals of blank screen time into the video students watched. These artificial blinks didn’t, however, trigger the same brain shift. Blinking, it would appear, was a deliberate — if unconscious — action and not just a response to a lack of visual stimuli. And here’s a kicker: The shift in brain function only occurred when subjects unconsciously blinked. Unfortunately, closing our eyes extra hard won’t trigger a more acute response.
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