Induced movement
Induced movement or induced motion is an
illusion ofvisual perception in which a stationary or a moving object appears to move or to move differently because of other moving objects nearby in thevisual field . 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 http://psychlab1.hanover.edu/Classes/Sensation/induced/
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. For an illustration, see http://www.uni-bielefeld.de/(en)/psychologie/ae/Ae01/forschung/indumo.html
History of induced movement
Induced movement was reported by
Ptolemy (ca. 90 – ca. 168 AD) (see Smith, 1996). It was researched extensively by Duncker (1929).ee also
*
Autokinetic effect
*Motion aftereffect
*Motion induced blindness
*Motion perception References
Duncker, K. (1929). Über induzierte Bewegung (Ein Beitrag zur Theorie optisch wahrgenommener Bewegung). "Psychologische Forschung, 12," 180-259.
Smith, A. M. (1996). Ptolemy's theory of visual perception: An English translation of the Optics with introduction and commentary. "Transactions of the American Philosophical Society, 86"(2).
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