afterimage

[af-ter-im-ij, ahf-]
noun Psychology.
a visual image or other sense impression that persists after the stimulus that caused it is no longer operative.

Origin:
1875–80; translation of German Nachbild; see after, image

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Collins
World English Dictionary
afterimage (ˈɑːftərˌɪmɪdʒ)
 
n
aftersensation, Also called: photogene a sustained or renewed sensation, esp visual, after the original stimulus has ceased

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

afterimage af·ter·im·age (āf'tər-ĭm'ĭj)
n.
A visual image that persists after the visual stimulus causing it has ceased to act. Also called photogene.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

afterimage

visual illusion in which retinal impressions persist after the removal of a stimulus, believed to be caused by the continued activation of the visual system. The afterimage may be positive, corresponding in colour or brightness to the original image, or negative, being less bright or of colours complementary to the original. A common afterimage is the spot of light one sees after a camera flash has been fired. The afterimage is the most readily observed of the class of phenomena known as aftersensations, or aftereffects.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
If you then look at a blank wall, you'll see a ghostly afterimage of the flag
  in reversed colors for a few seconds.
It is the afterimage of the dance rather than the dance itself which is the
  true subject of the review.
Its neck twisted and it dropped to the deck, leaving only its own afterimage
  and a small drop of blood.
Within several seconds, as the photoreceptor cells readjusted to their normal
  state, the afterimage faded away.
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