Aeromedical factorsQuestion 732 of 934

A pilot stares at a single light against a dark background. After a few seconds the light seems to move. What is this illusion?

  1. Autokinesis
  2. False horizon
  3. Reversible perspective
  4. The leans
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Correct answer: Autokinesis

Autokinesis happens when a pilot stares at a stationary light in the dark. A pilot may try to align the airplane with the light.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 8-1-5 Illusions in Flight, page 644

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Questions last reviewed: 18 October 2026