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Blinking: it happens every few seconds without you even thinking – unless of course, you're engaging in a staring competition of eye-watering proportions.
But blinking does more than wet the eye. Strangely, it also helps with vision, a new study shows. It's the latest effort in a string of research studies attempting to pinpoint what blinking is useful for, as we do it more often than necessary to lubricate the eye. However, we also lose our vision in short 300-millisecond blackouts each time we blink, even if we don't notice it happening. You might expect such an interruption to cut through the activity of neurons responsive to visual inputs – but perhaps not in a positive way.Following on from those findings, Yang and colleagues used high-resolution eye-tracking in this new study to investigate how blinking affects vision in 12 people who viewed images of varying contrast on a screen.
Relative to periods where participants fixated on the screen, the researchers found blinks increased the strength of visual input signals by modulating the intensity of light falling on the retina.
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