A string of lights in a store window are set up in such a way that one light flashes, followed by a second one that is adjacent to the first, followed by a third one, etc.
-If the timing between flashes is 100 milliseconds, what will observers perceive?
A) the phi phenomenon
B) no movement
C) an object moving through space
D) no lights

Question

Quizplus · Accepted Answer

The phi phenomenon is the optical illusion of perceiving continuous motion between separate objects viewed rapidly in succession. In this case, the flashing lights create the perception of movement.

A String of Lights in a Store Window Are Set