Moderate

The sequentially flashing Christmas tree lights appeared to generate pulsating waves of motion. This best illustrates:

Correct answer: D. The phi phenomenon

  • A. Visual capture
  • B. Relative motion
  • C. Retinal disparity
  • D. The phi phenomenon

Explanation

The phi phenomenon is the apparent movement produced when stationary lights flash in sequence, as in moving or pulsating signs. It is an illusion of motion rather than actual movement of the lights.

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