Peripheral Drift Illusion

In our 4th grade Primary Science classes we investigate many different concepts.

Recently we have talked about «peripheral drift illusion». Even though we might think our eyes are still, they are constantly moving rapidly, focusing on different areas of our vision.

In this illusion, the movement only occurs in the periphery of our vision, or the places where you are not looking!

The way to make the motion stop is to unfocus, or cross your eyes.

Like many perceptual illusions, the PDI plays an important role in helping scientists study and understand the processes involved with vision and perception. Stronger versions of the PDI may create a stronger reaction in the brain and make it easier for scientists to pinpoint exactly what causes the perception of motion.

Mark Paterson
4th Grade Tutor