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.

Look at other dictionaries:

  • Flash lag illusion — The flash lag illusion or flash lag effect is a visual illusion wherein a flash and a moving object that appear in the same location are perceived to be displaced from one another (MacKay, 1958; Nijhawan, 1994). Several explanations for this… …   Wikipedia

  • Optical illusion — This article is about visual perception. For the Time Requiem album, see Optical Illusion (album). An optical illusion. The square A is exactly the same shade of gray as square B. See checker shadow illusion. An optical illusion (also called a… …   Wikipedia

  • Spacing effect — In psychology, the spacing effect refers fact that humans more easily remember items in a list when they are studied a few times over a long period of time ( spaced presentation ), rather than studied repeatedly in a short period time ( massed… …   Wikipedia

  • drug use — Introduction       use of drugs for psychotropic rather than medical purposes. Among the most common psychotropic drugs are opiates ( opium, morphine, heroin), hallucinogens (LSD, mescaline, psilocybin), barbiturates, cocaine, amphetamines,… …   Universalium

  • Sleep paralysis — is paralysis associated with sleep that may occur in healthy persons or may be associated with narcolepsy, cataplexy, and hypnagogic hallucinations. The pathophysiology of this condition is closely related to the normal hypotonia that occurs… …   Wikipedia

  • Lucid dream — A lucid dream is a dream in which one is aware that one is dreaming. The term was coined by the Dutch psychiatrist and writer Frederik (Willem) van Eeden (1860–1932).[1] In a lucid dream, the dreamer can actively participate in and manipulate… …   Wikipedia

  • McGurk effect — The McGurk effect is a perceptual phenomenon which demonstrates an interaction between hearing and vision in speech perception. It is a compelling illusion in which humans perceive mismatched audiovisual speech as a completely different… …   Wikipedia

  • Linguistic relativity and the color naming debate — Linguistic relativity stems from a question about the relationship between language and thought, about whether one s language determines the way one thinks. This question has given birth to a wide array of research within a variety of different… …   Wikipedia

  • Control theory — For control theory in psychology and sociology, see control theory (sociology) and Perceptual Control Theory. The concept of the feedback loop to control the dynamic behavior of the system: this is negative feedback, because the sensed value is… …   Wikipedia

  • History of psychology — The history of psychology as a scholarly study of the mind and behavior dates back to the Ancient Greeks. There is also evidence of psychological thought in ancient Egypt. Psychology was a branch of philosophy until the 1870s, when psychology… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”