Retinal Persistence
Retinal persistence is the visual phenomenon where an image briefly remains on the retina after the light source has vanished, creating the illusion of smooth motion in sequences of still images. This effect is foundational to technologies like film and animation, though modern neuroscience has shown it's more about brain processing than just the eye's retention.
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Retinal persistence is what makes watching movies possible at just 24 frames per second without seeing jerky motion, a trick that saved early filmmakers immense costs in production. This phenomenon was first demonstrated in 1832 with the phenakistoscope, invented by Belgian physicist Joseph Plateau, and it continues to influence digital displays, where refresh rates above 60 Hz minimize flicker for a seamless experience.
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