Induced movement
Induced movement or induced motion is an illusion
An illusion is a distortion of the senses, revealing how the brain normally organizes and interprets sensory stimulation. While illusions distort reality, they are generally shared by most people....

 of visual perception
Visual perception
Visual perception is the ability to interpret information and surroundings from the effects of visible light reaching the eye. The resulting perception is also known as eyesight, sight, or vision...

 in which a stationary or a moving object appears to move or to move differently because of other moving objects nearby in the visual field
Visual field
The term visual field is sometimes used as a synonym to field of view, though they do not designate the same thing. The visual field is the "spatial array of visual sensations available to observation in introspectionist psychological experiments", while 'field of view' "refers to the physical...

. The object affected by the illusion is called the target, and the other moving objects are called the background or the context (Duncker, 1929).

Induced movement with stationary target

A stationary object appears to move in the opposite direction to the background. For example, the moon on a cloudy, windy night appears to be racing through the sky opposite to the direction of the clouds, even though the moon is essentially stationary in the sky. For an illustration, see

Induced movement with a moving target

A moving object appears to be moving faster when it is moving in the opposite direction to the background; it appears to be moving slower when it is moving in the same direction as the background.

Drug- induced Movement Disorders

Low CNS penetration is the result from drug-induced movement disorders, which has occasionally been associated with the use of domperidone(Hae-Won Shin et al., 2009). Therefore, there is close monitoring of patients if treatment with peripheral dopamine antagonists are used(Hae-Won Shin et al., 2009).

History of induced movement

Induced movement was reported by Ptolemy
Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...

 (ca. 90 – ca. 168 AD) (see Smith, 1996). It was researched extensively by Duncker (1929).

See also

  • Autokinetic effect
    Autokinetic effect
    The autokinetic effect is a phenomenon of human visual perception in which a stationary, small point of light in an otherwise dark or featureless environment appears to move. It was first recorded by a Russian officer keeping watch who observed illusory movement of a star near the horizon...

  • Motion aftereffect
    Motion aftereffect
    The motion after-effect is a visual illusion experienced after viewing a moving visual stimulus for a time with stationary eyes, and then fixating a stationary stimulus. The stationary stimulus appears to move in the opposite direction to the original stimulus...

  • Motion induced blindness
    Motion induced blindness
    Motion Induced Blindness is a phenomenon of visual disappearance or perceptual illusions in which salient visual stimuli disappear as if erased in front of an observer's eyes.-Overview:...

  • Motion perception
    Motion perception
    Motion perception is the process of inferring the speed and direction of elements in a scene based on visual, vestibular and proprioceptive inputs...

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