- 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.ReferencesHeron, 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. J.D. Blom. 2010.
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