(1) The “Phi” phenomenon. That refers to the observation that we can perceive continuous movement although only a sequence of static images is presented, this is also known as “apparent motion”. Max Wertheimer (1912) called it “phi” because he studied circular motion where the angle phi parameterised the step size.

What is phi phenomenon explain?

The so-called phi phenomenon is an illusion of movement that arises when stationary objects—light bulbs, for example—are placed side by side and illuminated rapidly one after another. The effect is frequently used on theatre marquees to give the impression of moving lights.

Why was the phi phenomenon important?

The discovery of phi phenomena played a significant role in Gestalt psychology, as it changed the way perception was studied. Illusions like the phi phenomenon continue to help scientists find new ways to study the way the human brain and visual system perceive and interpret information.