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Discussion

A negative afterimage arises because

  • A.the illuminant shifts during the period of observation
  • B.the cone types stimulated become temporarily less sensitive
  • C.the retina emits light of the complementary colour
  • D.the object itself physically changes colour while being viewed

Answer: B

Staring at red fatigues the long wavelength response and a cyan afterimage follows. The complementary relationship follows directly from the opponent organisation of the visual system. Fatigue of one channel reveals its opposite.

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