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When your mind wanders, you're not paying attention to what's going in front of you. A new study suggests that it's not just the mind, it's the body, too; when subjects' minds wandered, they blinked more, setting up a tiny physical barrier between themselves and the outside world.
Cognitive neuroscientist Daniel Smilek, of the University of Waterloo, studies how people pay attention -- and don't. For this study, he was inspired by brain research that shows, when the mind wanders, the parts of the brain that process external goings-on are less active. "And we thought, OK, if that's the case, maybe we'd see that the body would start to do things to prevent the brain from receiving external information," Smilek says. "The simplest thing that might happen is you might close your eyes more."
So, Smilek and his colleagues, Jonathan S.A. Carriere and J. Allan Cheyne, also of the University of Waterloo, set out to look at how often people blink when their mind wanders.