When a sparkler is twirled rapidly, people perceive a circle of light. This occurs because
A) the trail you see is caused by sparks left behind from the sparkler.
B) longer light wavelengths from the sparkler produce a visual echoic effect.
C) the length of iconic memory is about a fraction of a second.
D) Gestalt principles work to complete the circle in our minds.

Question

Quizplus · Accepted Answer

The perception of a circle of light is due to the persistence of vision, where the image remains in our iconic memory for a fraction of a second, allowing us to perceive continuous motion.

When a Sparkler Is Twirled Rapidly, People Perceive a Circle