How Vanishing Dots work

The yellow dots never left the screen. Your brain hid them from you. Scientists call this motion-induced blindness.

A famous illusion

Three scientists, Yoram Bonneh, Alexander Cooperman and Dov Sagi, discovered it in 2001. A moving pattern surrounds a few small dots that stay still. You look at a point away from the dots. After a few seconds, a dot vanishes. Sometimes two or all three go at once. A moment later, they pop back.

Why your brain erases them

Your eyes send your brain far more than it can use, so it keeps deciding what matters. Moving things matter a lot. A small dot that never moves or changes, away from where you are looking, can seem unimportant. So for a few seconds your brain drops it from what you see. It fills the gap with what is around it.

Scientists are still working out exactly why. One idea is a tug of war between two signals: one says something is moving there, the other says a still dot is there. For a moment, the motion wins. Another idea is attention: when it drifts away from a dot, the dot fades. A third is filling in, the same trick that hides the blind spot in each of your eyes.

Make it work better

Keep your eyes on the green dot and hold your head still. Moving your eyes brings the dots straight back.