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This is Scientific Americans' 60-second Science. I'm Karen Hopkins.

You're at a party and you suddenly feel someone looking at you.

But how can it be possible to feel another person's gaze?

I mean, it's not like people shoot actual beams out of their eyes.

Yet, a new study suggests that unconsciously, we actually do believe that looking exerts

a slight force on the things being looked at. That eye-opening finding appears in the

proceedings of the National Academy of Sciences. Vision depends on light entering the eye, a form of

ocular intromission, if you will. But kids, even those in college, often express a belief in extra mission, the idea that

the eyes emit a form of invisible energy.

To probe this perception, researchers at Princeton asked volunteers to look at a computer

screen and gauge the angle at which a cardboard tube, shown being slowly tilted on its side, would finally topple over.

Now, in some of the tests, they included an image of a young man watching the tube as it tilted toward him.

What the researchers found is that when there was someone staring at the tube,

subjects thought that the tube could tilt a little further before it toppled toward the fellow looking at it.

Which means that unconsciously, the volunteers must have imagined that the guy's gaze exerted a slight force on the tube, keeping it from falling.

But this force was not strong.

When the researchers replaced the cardboard tube with a brick, the subjects

...