perceptual lag phenomenon

perceptual lag phenomenon
   A term introduced in or shortly before 1956 by the Canadian psychologists Woodburn Heron et al. to denote an apparent reduction in the speed of moving objects, induced by * sensory deprivation. Heron et al. illustrate this phenomenon by describing the S-shaped appearance of a straight, rotating line. This S-shaped appearance is attributed to perceptual lag, in the sense that the ends of the line appear to lag behind the central part. A reduction of up to 40% in the apparent speed of moving lines was reported in numerous studies that followed in the wake ofthis initial finding. The perceptual lag phenomenon is usually classified as a *physiological illusion. A variant in which the apparent speed of a visual stimulus is influenced by sounds is known as temporal ventriloquism.
   References
   Heron, W., Doane, B.K., Scott, T.H. (1956). Visual disturbances after prolonged perceptual isolation. Canadian Journal of Psychology, 10, 13-18.
   Zubek, J.P. (1969). Sensory and perceptual-motor effects.In: Sensory deprivation: Fifteen years of research. Edited by Zubek, J.P. New York, NY: Appleton-Century-Crofts.

Dictionary of Hallucinations. . 2010.

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