Visual Phenomena
In some cases, it is possible to indirectly detect flicker at rates well beyond 60 Hz in the case of high-speed motion, via the "phantom array" effect. Fast-moving flickering objects zooming across view (either by object motion, or by eye motion such as rolling eyes), can cause a dotted or multicolored blur instead of a continuous blur, as if they were multiple objects. Stroboscopes are sometimes used to induce this effect intentionally. Some special effects, such as certain kinds of electronic glowsticks commonly seen at outdoor events, have the appearance of a solid color when motionless but produce a multicolored or dotted blur when waved about in motion. These are typically LED-based glow sticks. For a single color, flashing an LED, rather than a constant on state uses less power for the same perceived brightness. The multicolored effect is where a combination of different color LEDs are used. A combination of red, green and blue LEDs allow almost any color to be produced. Yellow, for example, is a combination of red and green. When moving the glow stick, timing differences between the on/off state of the different LEDs becomes evident, and the colors are separated into their separate components.
A related phenomenon is the DLP Rainbow Effect, where different colors are displayed in different places on the screen for the same object due to fast motion.
The stroboscopic effect is sometimes used to "stop motion" or to study small differences in repetitive motions.
Read more about this topic: Flicker Fusion Threshold
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