A string of Christmas lights that are turning off and on one after another are perceived as moving. This response is known as
A) motion parallax.
B) the phi phenomenon.
C) saccadic movement.
D) the Doppler effect
E) movement constancy.

Question

Quizplus · Accepted Answer

The phi phenomenon is the correct answer because it refers to the optical illusion of perceiving continuous motion between separate objects viewed rapidly in succession, such as lights turning on and off in a sequence, which creates the illusion of movement.

A String of Christmas Lights That Are Turning Off and on One