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aftereffect

aftereffect  

Any phenomenon occurring some time after its cause, especially (in psychology) a delayed sensory or perceptual experience. See also afterimage, Aubert effect, contingent aftereffect, figural ...
after-effect, perceptual

after-effect, perceptual  

Exposure to a sensory stimulus can produce illusory perceptual experiences immediately following this exposure period. The period of initial stimulation is typically called the adaptation period and ...
aftersensation

aftersensation  

Any sensation persisting after the cessation of the stimulus (1, 3), especially an afterimage or an aftertaste.
apparent motion

apparent motion  

A sensation of movement in the absence of actual movement, especially a class of visual illusions that arise when two visual stimuli a few centimetres apart are exposed or displayed in an alternating ...
Bidwell's ghost

Bidwell's ghost  

An afterimage trailing behind a moving spot of light that is observed with dark-adapted eyes and fixated gaze in a dimly lit room. Behind the moving spot, with a delay of about 0.2 second, there ...
colour induction

colour induction  

The generation of illusory sensations of colour without direct stimulation of the corresponding cones in the retina, by any of a number of different devices. US color induction. See also afterimage, ...
complementary afterimage

complementary afterimage  

An afterimage in which colours appear approximately as the complementary colours of the original stimulus. See also negative afterimage (1, 2), positive afterimage.
eidetic image

eidetic image  

A mental image or memory that is extraordinarily clear and vivid, as though actually being perceived, a significant minority of children and a much smaller proportion of adults being capable of such ...
Emmert's law

Emmert's law  

The apparent increase in the size of a visual afterimage when viewed against a relatively nearby surface and then against a more distant surface. Formally, the law asserts that h/H = d/D, where h is ...
Ewald Hering

Ewald Hering  

(1834–1918).German physiologist, born and raised near the Bohemian border; the son of a pastor. He studied medicine in Leipzig in the 1850s. His contributions to sensory physiology contrast ...
flashback

flashback  

1 In a novel, film, or other fictional work, a sudden transition to an earlier episode in the narrative.2 A recurrence of a memory, or the experience of reliving an episode from the past. See also ...
flight of colours

flight of colours  

The sequence of afterimages of different colours that follow brief exposure to a bright stimulus, especially in dark-adapted eyes. It can be demonstrated by adapting one's eyes in the dark for 25 ...
ghost

ghost  

Now chiefly, an apparition of a dead person which is believed to appear or become manifest to the living, typically as a nebulous image and attempting to right a wrong done in life; this sense of the ...
Hering image

Hering image  

The first afterimage in the sequence of afterimages that follow brief exposure to a bright light, a positive afterimage provided that the original stimulus was lighter than its surroundings, ...
Hermann Ludwig Ferdinand von Helmholtz

Hermann Ludwig Ferdinand von Helmholtz  

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Overview Page
(1821–94)German physiologist and physicist. In 1850 he measured the speed of a nerve impulse and in 1851 invented the ophthalmoscope. Helmholtz discovered the conservation of energy (1847), giving ...
Hess image

Hess image  

A third positive afterimage occurring in the sequence of afterimages that result from exposure to a brief light stimulus. Also called a Hess afterimage. See also afterimage. Compare Hering image, ...
image

image  

1 The representation of an object that is produced when electromagnetic radiation passes through it or is reflected from it. Visible images are formed when light impinges on the retina, and various ...
negative afterimage

negative afterimage  

1 An afterimage in which the lightness contrasts are reversed, light areas of the original stimulus appearing dark and dark areas appearing light. See also complementary afterimage. Compare positive ...
perception of films

perception of films  

The explanatory power of perceptual theories and the generality of perceptual research findings are both strongly challenged by the sensory phenomena on which motion pictures and television are ...
persistence of vision

persistence of vision  

Reference type:
Overview Page
Subject:
Media studies
1. A discredited theory explaining the perception of motion pictures which assumes that an impression of the visual field (known as an after-image) either remains on the retina of the eye or is ...

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