Persistence of vision is defined as what phenomenon?

• A. The Eyes Ability To Retain An Action 0.04 Seconds After It Ended
• B. The Brain’s Ability To Remember A Sound Clip For 24 Hours
• C. The Clarity Of Images In Bright Light
• D. The Ear’s Ability To Detect Subtle Frequencies Over Time

Answer: (A)

Persistence of vision is the brief retention of a visual image after the stimulus ends, so the image lingers long enough for the next frame to come along and the brain to fuse them into motion. This lingering is why film and animation look smooth: each frame is shown for a tiny fraction of a second, and the faint trace of the previous frame helps our eyes perceive continuous movement. The common reference to about 0.04 seconds captures that very short, automatic hold on the last image.

The other descriptions point to memory for sounds, or to sharpness of vision in bright light, or to how the ear detects frequencies over time, none of which describe this short visual after-image effect.